6 research outputs found
The GALAH Survey: Using galactic archaeology to refine our knowledge of TESS target stars
An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especially their mass and radius, will depend heavily upon the measured physical characteristics of their host stars. We have cross-matched spectroscopic, photometric, and astrometric data from GALAH Data Release 2, the TESS Input Catalog and Gaia Data Release 2, to create a curated, self-consistent catalogue of physical and chemical properties for 47 285 stars. Using these data, we have derived isochrone masses and radii that are precise to within 5 per cent. We have revised the parameters of three confirmed, and twelve candidate, TESS planetary systems. These results cast doubt on whether CTOI-20125677 is indeed a planetary system, since the revised planetary radii are now comparable to stellar sizes. Our GALAH-TESS catalogue contains abundances for up to 23 elements. We have specifically analysed the molar ratios for C/O, Mg/Si, Fe/Si, and Fe/Mg, to assist in determining the composition and structure of planets with Rp < 4R⊕. From these ratios, 36 per cent fall within 2 sigma of the Sun/Earth values, suggesting that these stars may host rocky exoplanets with geological compositions similar to planets found within our own Solar system.JTC would like to thank SW, BC, and DN, and is supported
by the Australian Government Research Training Program (RTP)
Scholarship. JTC would also like to thank Vardan Adibekyan for
their valuable comments which have significantly improved the
science of this manuscript. JDS and SM acknowledges the support
of the Australian Research Council through Discovery Project
grant DP180101791. SB acknowledges funds from the Australian
Research Council (grants DP150100250 and DP160103747). Parts
of this research were supported by the Australian Research Council
(ARC) Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. YST is
grateful to be supported by the NASA Hubble Fellowship grant HSTHF2-51425.001 awarded by the Space Telescope Science Institute
Deci-AI/super-gradients: 3.1.2
What's Changed
Hotfix/sg 000 fix doc typo rf100 by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/897
Fixed false-positive warning message by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/886
Update deprecate -> deprecated by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/906
Fix not-closed tqdm by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/909
Update of PoseEstimation model by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/872
Update the notebooks to install super_gradients==3.1 by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/924
Fix the bug with YOLONAS of not supporting overriding in_channels by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/923
Feature/sg 000 no explicit pil by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/908
Force predictions as list by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/945
Feature/sg 850 support torch 2.0 by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/944
Bug/sg 764 wrong ckpt when resuming with external ckpt root dir by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/948
Fix typo in welcome.html by @eltociear in https://github.com/Deci-AI/super-gradients/pull/941
Add detection prediction tutorial by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/943
Update YoloNASQuickstart.md by @avideci in https://github.com/Deci-AI/super-gradients/pull/970
Fix preprocessing by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/972
Fix train_loader not initalized properly by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/981
Fix empty mask in MaskAttentionLoss by @lkdci in https://github.com/Deci-AI/super-gradients/pull/982
changed requirement by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1002
Fix convert_to_onnx to correctly handle case when input_shape is None by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/989
Feature/sg 757 resume for spots by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/870
Cityscapes AutoLabelling dataset by @lkdci in https://github.com/Deci-AI/super-gradients/pull/1000
Predict on fused model by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/998
Proposal of issue template by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1018
Fix doc by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1019
Fixed missing encoding (Issue #999) by @T0T4R4 in https://github.com/Deci-AI/super-gradients/pull/1044
Cache model from platform locally by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1009
Feature/infra 000 nightly by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1051
Added CoreML export notebook & method for Apple devices. by @avideci in https://github.com/Deci-AI/super-gradients/pull/1068
Bug/sg 861 decouple qat from train from config by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1001
updated contributing.md by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/965
Draw most likely bbox on top (#1061) by @laszlovandenhoek in https://github.com/Deci-AI/super-gradients/pull/1063
replace documentation 'onnx' with 'coreml' by @shanibenbaruch in https://github.com/Deci-AI/super-gradients/pull/1074
Fix deprecated usage of pycocotools by @fcakyon in https://github.com/Deci-AI/super-gradients/pull/1052
YoloNAS benchmarking tutorial by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1076
Fix arch_param deprecated by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1084
fix deprecated naming for stdc by @ofrimasad in https://github.com/Deci-AI/super-gradients/pull/1094
fix: Plot boxes by @yurkovak in https://github.com/Deci-AI/super-gradients/pull/1097
Added link to new QAT fine-tuning notebook (YoloNAS) + removed github notebooks by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1100
Hotfix/sg 000 fix breaking changes in some imports by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1101
Hotfix/sg 000 dekr weights hotfix by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1102
Fixed resuming training with DDP when average_best_models=true by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1111
Update deci-lab-client usage by @roikoren755 in https://github.com/Deci-AI/super-gradients/pull/1047
Feature/sg 815 fix override dataset params by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1092
Bug/sg 896 add deprecation for previous breaking changes by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1121
Actualize pose estimatino zoo. by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1114
Typo fix in modify_params_for_qat by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1129
Bug/sg 897 support for min samples with ddp by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1128
strict_load fixed in recipe default checkpoint_params by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1130
bump version by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1132
Update Weights & Biases Integration + Add Prediction Visualization for Object Detection by @soumik12345 in https://github.com/Deci-AI/super-gradients/pull/1010
Bug/sg 000 fix tests by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1131
Allow checkpoint_path to be an url (Required for transfer learning) by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1138
Fix incorrect use of collections.OrderedDict in type annotation by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1141
Bug/sg 000 merge failure for datasetparams by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1140
New Contributors
@eltociear made their first contribution in https://github.com/Deci-AI/super-gradients/pull/941
@T0T4R4 made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1044
@laszlovandenhoek made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1063
@fcakyon made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1052
@soumik12345 made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1010
Full Changelog: https://github.com/Deci-AI/super-gradients/compare/3.1.1...3.1.
Deci-AI/super-gradients: 3.1.2
What's Changed
Hotfix/sg 000 fix doc typo rf100 by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/897
Fixed false-positive warning message by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/886
Update deprecate -> deprecated by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/906
Fix not-closed tqdm by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/909
Update of PoseEstimation model by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/872
Update the notebooks to install super_gradients==3.1 by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/924
Fix the bug with YOLONAS of not supporting overriding in_channels by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/923
Feature/sg 000 no explicit pil by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/908
Force predictions as list by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/945
Feature/sg 850 support torch 2.0 by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/944
Bug/sg 764 wrong ckpt when resuming with external ckpt root dir by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/948
Fix typo in welcome.html by @eltociear in https://github.com/Deci-AI/super-gradients/pull/941
Add detection prediction tutorial by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/943
Update YoloNASQuickstart.md by @avideci in https://github.com/Deci-AI/super-gradients/pull/970
Fix preprocessing by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/972
Fix train_loader not initalized properly by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/981
Fix empty mask in MaskAttentionLoss by @lkdci in https://github.com/Deci-AI/super-gradients/pull/982
changed requirement by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1002
Fix convert_to_onnx to correctly handle case when input_shape is None by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/989
Feature/sg 757 resume for spots by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/870
Cityscapes AutoLabelling dataset by @lkdci in https://github.com/Deci-AI/super-gradients/pull/1000
Predict on fused model by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/998
Proposal of issue template by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1018
Fix doc by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1019
Fixed missing encoding (Issue #999) by @T0T4R4 in https://github.com/Deci-AI/super-gradients/pull/1044
Cache model from platform locally by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1009
Feature/infra 000 nightly by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1051
Added CoreML export notebook & method for Apple devices. by @avideci in https://github.com/Deci-AI/super-gradients/pull/1068
Bug/sg 861 decouple qat from train from config by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1001
updated contributing.md by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/965
Draw most likely bbox on top (#1061) by @laszlovandenhoek in https://github.com/Deci-AI/super-gradients/pull/1063
replace documentation 'onnx' with 'coreml' by @shanibenbaruch in https://github.com/Deci-AI/super-gradients/pull/1074
Fix deprecated usage of pycocotools by @fcakyon in https://github.com/Deci-AI/super-gradients/pull/1052
YoloNAS benchmarking tutorial by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1076
Fix arch_param deprecated by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1084
fix deprecated naming for stdc by @ofrimasad in https://github.com/Deci-AI/super-gradients/pull/1094
fix: Plot boxes by @yurkovak in https://github.com/Deci-AI/super-gradients/pull/1097
Added link to new QAT fine-tuning notebook (YoloNAS) + removed github notebooks by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1100
Hotfix/sg 000 fix breaking changes in some imports by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1101
Hotfix/sg 000 dekr weights hotfix by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1102
Fixed resuming training with DDP when average_best_models=true by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1111
Update deci-lab-client usage by @roikoren755 in https://github.com/Deci-AI/super-gradients/pull/1047
Feature/sg 815 fix override dataset params by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1092
Bug/sg 896 add deprecation for previous breaking changes by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1121
Actualize pose estimatino zoo. by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1114
Typo fix in modify_params_for_qat by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1129
Bug/sg 897 support for min samples with ddp by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1128
strict_load fixed in recipe default checkpoint_params by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1130
bump version by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1132
New Contributors
@eltociear made their first contribution in https://github.com/Deci-AI/super-gradients/pull/941
@T0T4R4 made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1044
@laszlovandenhoek made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1063
@fcakyon made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1052
Full Changelog: https://github.com/Deci-AI/super-gradients/compare/3.1.1...3.1.
Deci-AI/super-gradients: 3.1.2
What's Changed
Hotfix/sg 000 fix doc typo rf100 by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/897
Fixed false-positive warning message by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/886
Update deprecate -> deprecated by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/906
Fix not-closed tqdm by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/909
Update of PoseEstimation model by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/872
Update the notebooks to install super_gradients==3.1 by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/924
Fix the bug with YOLONAS of not supporting overriding in_channels by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/923
Feature/sg 000 no explicit pil by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/908
Force predictions as list by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/945
Feature/sg 850 support torch 2.0 by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/944
Bug/sg 764 wrong ckpt when resuming with external ckpt root dir by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/948
Fix typo in welcome.html by @eltociear in https://github.com/Deci-AI/super-gradients/pull/941
Add detection prediction tutorial by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/943
Update YoloNASQuickstart.md by @avideci in https://github.com/Deci-AI/super-gradients/pull/970
Fix preprocessing by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/972
Fix train_loader not initalized properly by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/981
Fix empty mask in MaskAttentionLoss by @lkdci in https://github.com/Deci-AI/super-gradients/pull/982
changed requirement by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1002
Fix convert_to_onnx to correctly handle case when input_shape is None by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/989
Feature/sg 757 resume for spots by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/870
Cityscapes AutoLabelling dataset by @lkdci in https://github.com/Deci-AI/super-gradients/pull/1000
Predict on fused model by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/998
Proposal of issue template by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1018
Fix doc by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1019
Fixed missing encoding (Issue #999) by @T0T4R4 in https://github.com/Deci-AI/super-gradients/pull/1044
Cache model from platform locally by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1009
Feature/infra 000 nightly by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1051
Added CoreML export notebook & method for Apple devices. by @avideci in https://github.com/Deci-AI/super-gradients/pull/1068
Bug/sg 861 decouple qat from train from config by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1001
updated contributing.md by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/965
Draw most likely bbox on top (#1061) by @laszlovandenhoek in https://github.com/Deci-AI/super-gradients/pull/1063
replace documentation 'onnx' with 'coreml' by @shanibenbaruch in https://github.com/Deci-AI/super-gradients/pull/1074
Fix deprecated usage of pycocotools by @fcakyon in https://github.com/Deci-AI/super-gradients/pull/1052
YoloNAS benchmarking tutorial by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1076
Fix arch_param deprecated by @Louis-Dupont in https://github.com/Deci-AI/super-gradients/pull/1084
fix deprecated naming for stdc by @ofrimasad in https://github.com/Deci-AI/super-gradients/pull/1094
fix: Plot boxes by @yurkovak in https://github.com/Deci-AI/super-gradients/pull/1097
Added link to new QAT fine-tuning notebook (YoloNAS) + removed github notebooks by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1100
Hotfix/sg 000 fix breaking changes in some imports by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1101
Hotfix/sg 000 dekr weights hotfix by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1102
Fixed resuming training with DDP when average_best_models=true by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1111
Update deci-lab-client usage by @roikoren755 in https://github.com/Deci-AI/super-gradients/pull/1047
Feature/sg 815 fix override dataset params by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1092
Bug/sg 896 add deprecation for previous breaking changes by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1121
Actualize pose estimatino zoo. by @BloodAxe in https://github.com/Deci-AI/super-gradients/pull/1114
Typo fix in modify_params_for_qat by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1129
Bug/sg 897 support for min samples with ddp by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1128
strict_load fixed in recipe default checkpoint_params by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1130
bump version by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1132
Update Weights & Biases Integration + Add Prediction Visualization for Object Detection by @soumik12345 in https://github.com/Deci-AI/super-gradients/pull/1010
Bug/sg 000 fix tests by @shaydeci in https://github.com/Deci-AI/super-gradients/pull/1131
New Contributors
@eltociear made their first contribution in https://github.com/Deci-AI/super-gradients/pull/941
@T0T4R4 made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1044
@laszlovandenhoek made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1063
@fcakyon made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1052
@soumik12345 made their first contribution in https://github.com/Deci-AI/super-gradients/pull/1010
Full Changelog: https://github.com/Deci-AI/super-gradients/compare/3.1.1...3.1.
The GALAH Survey : improving our understanding of confirmed and candidate planetary systems with large stellar surveys
Pioneering photometric, astrometric, and spectroscopic surveys is helping exoplanetary scientists better constrain the fundamental properties of stars within our galaxy and the planets these stars host. In this study, we use the third data release from the stellar spectroscopic GALAH Survey, coupled with astrometric data of eDR3 from the Gaia satellite, and other data from NASA's Exoplanet Archive, to refine our understanding of 279 confirmed and candidate exoplanet host stars and their exoplanets. This homogenously analysed data set comprises 105 confirmed exoplanets, along with 146 K2 candidates, 95 TESS Objects of Interest (TOIs), and 52 Community TOIs (CTOIs). Our analysis significantly shifts several previously (unknown) planet parameters while decreasing the uncertainties for others. Our radius estimates suggest that 35 planet candidates are more likely brown dwarfs or stellar companions due to their new radius values. We are able to refine the radii and masses of WASP-47 e, K2-106 b, and CoRoT-7 b to their most precise values yet to less than 2.3 per cent and 8.5 per cent, respectively. We also use stellar rotational values from GALAH to show that most planet candidates will have mass measurements that will be tough to obtain with current ground-based spectrographs. With GALAH's chemical abundances, we show through chemo-kinematics that there are five planet hosts that are associated with the galaxy's thick disc, including NGTS-4, K2-183, and K2-337. Finally, we show that there is no statistical difference between the chemical properties of hot Neptune and hot rocky exoplanet hosts, with the possibility that short-period rocky worlds might be the remnant cores of hotter, gaseous worlds.</p
Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778
NASA's Transiting Exoplanet Survey Satellite (TESS) mission, has been
uncovering a growing number of exoplanets orbiting nearby, bright stars. Most
exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating
stars, facilitating the confirmation and mass determination of these worlds. We
present the discovery of a hot Jupiter orbiting a rapidly rotating
(km/s) early F3V-dwarf, HD115447 (TOI-778). The transit
signal taken from Sectors 10 and 37 of TESS's initial detection of the
exoplanet is combined with follow-up ground-based photometry and velocity
measurements taken from Minerva-Australis, TRES, CORALIE and CHIRON to confirm
and characterise TOI-778b. A joint analysis of the light curves and the radial
velocity measurements yield a mass, radius, and orbital period for TOI-778b of
Mjup, Rjup and days,
respectively. The planet orbits a bright (mag) F3-dwarf with
Msun, Rsun, and . We observed
a spectroscopic transit of TOI-778b, which allowed us to derive a sky-projected
spin-orbit angle of , consistent with an aligned
planetary system. This discovery demonstrates the capability of smaller
aperture telescopes such as Minerva-Australis to detect the radial velocity
signals produced by planets orbiting broad-line, rapidly rotating stars.Comment: 18 pages, 9 figures, and 4 tables. Submitted to the Astronomical
Journa
