1,724,261 research outputs found
Optical polarization observations in the Scorpius region: NGC 6124
No full textWe have obtained optical multicolour (UBVRI) linear polarimetric data for 46 of the brightest stars in the area of the open cluster NGC 6124 in order to investigate the properties of the interstellar medium (ISM) that lies along the line of sight towards the cluster. Our data yield a mean polarization efficiency of PV/E(B - V) = 3.1 ± 0.62, i.e. a value lower than the polarization produced by the ISM with normal efficiency for an average colour excess of E(B - V) = 0.80 as that found for NGC 6124. Besides, the polarization shows an orientation of which is not parallel to the Galactic disc, an effect that we think may be caused by the Lupus cloud. Our analysis also indicates that the observed visual extinction in NGC 6124 is caused by the presence of three different absorption sheets located between the Sun and NGC 6124. The values of the internal dispersion of the polarization (ΔPV ∼ 1.3 per cent) and of the colour excess (ΔE(B - V) ∼ 0.29 mag) for the members of NGC 6124 seem to be compatible with the presence of an intracluster dust component. Only six stars exhibit some evidence of intrinsic polarization. Our work also shows that polarimetry provides an excellent tool to distinguish between member and non-member stars of a cluster.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plat
A multi-wavelength interferometric study of the massive young stellar object IRAS 13481-6124
No full textWe present new mid-infrared interferometric observations of the massive young stellar object IRAS 13481-6124, using VLTI/MIDI for spectrally-resolved, long-baseline measurements (projected baselines up to ∼120 m) and GSO/T-ReCS for aperture-masking interferometry in five narrow-band filters (projected baselines of ∼1.8−6.4 m) in the wavelength range of 7.5−13 μ m. We combine these measurements with previously-published interferometric observations in the K and N bands in order to assemble the largest collection of infrared interferometric observations for a massive YSO to date. Using a combination of geometric and radiative-transfer models, we confirm the detection at mid-infrared wavelengths of the disk previously inferred from near-infrared observations. We show that the outflow cavity is also detected at both near- and mid-infrared wavelengths, and in fact dominates the mid-infrared emission in terms of total flux. For the disk, we derive the inner radius (∼1.8 mas or ∼6.5 AU at 3.6 kpc), temperature at the inner rim (∼1760 K), inclination (∼48 deg) and position angle (∼107 deg). We determine that the mass of the disk cannot be constrained without high-resolution observations in the (sub-)millimeter regime or observations of the disk kinematics, and could be anywhere from ∼10 −3 to 20 M ⊙ . Finally, we discuss the prospects of interpreting the spectral energy distributions of deeply-embedded massive YSOs, and warn against attempting to infer disk properties from the SED
NICER Detects Pulsations from Swift J0243.6+6124
No full textMAXI/GSC detected an increase in X-ray flux at 13:23 UT on April 8, 2023, in the field containing the transient Be X-ray pulsar Swift J0243.6+6124 as well as the high-mass gamma-ray binary LS I +61 303 (ATel #15983). Swift/XRT performed follow-up observations of the MAXI error region and reported that Swift J0243.6+6124 is likely the source of the MAXI/GSC trigger (ATel #15984). NICER observed Swift J0243.6+6124 for a total exposure time of 6.2 ks starting from 15:05 UT on April 10, 2023. The 0.6-10.0 keV count rate is 18.4(1) c/s.NICER detects pulsations at around 9.8 s with a Z2 search at the 32σ significance level. In what follows, the timing and spectroscopy analyses were done over 0.6-10.0 keV, given the absorption along the line of sight (see below). The final pulsation frequency estimate is 0.1020(2) Hz. The folded pulse profile is sinusoidal, and the corresponding fractional sinusoidal amplitude is ~18%. No orbital corrections were applied.A broadband 0.6-10.0 keV spectral analysis found that an absorbed cutoff power-law model fits the data with a chi-squared value of 121 for 114 degrees of freedom. We find an absorption column density of nH = 0.99 (-0.04, +0.05)× 1022 cm-2, a photon index of -0.16 (-0.09, +0.09), and a cutoff energy of 4.3 (-0.4, +0.5) keV. The corresponding 0.6-10.0 keV absorbed flux is ~1.7 × 10-10 erg/s/cm2; and the 0.6-10.0 keV unabsorbed flux is 1.875 (-0.012, +0.013) × 10-10 erg/s/cm2, which suggests a decrease in flux by about a factor of 4 compared with the Swift/XRT observations. Uncertainties are reported at 90% confidence.NICER will continue to observe Swift J0243.6+6124. We encourage further observations with other facilities.NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA
Optical polarization observations in the Scorpius region: NGC 6124
No full textWe have obtained optical multicolour (UBVRI) linear polarimetric data for 46 of the brightest stars in the area of the open cluster NGC 6124 in order to investigate the properties of the interstellar medium (ISM) that lies along the line of sight towards the cluster. Our data yield a mean polarization efficiency of PV/E(B - V) = 3.1 +/- 0.62, i.e. a value lower than the polarization produced by the ISM with normal efficiency for an average colour excess of E(B - V) = 0.80 as that found for NGC 6124. Besides, the polarization shows an orientation of which is not parallel to the Galactic disc, an effect that we think may be caused by the Lupus cloud. Our analysis also indicates that the observed visual extinction in NGC 6124 is caused by the presence of three different absorption sheets located between the Sun and NGC 6124. The values of the internal dispersion of the polarization (ΔPV ~ 1.3 per cent) and of the colour excess (ΔE(B - V) ~ 0.29 mag) for the members of NGC 6124 seem to be compatible with the presence of an intracluster dust component. Only six stars exhibit some evidence of intrinsic polarization. Our work also shows that polarimetry provides an excellent tool to distinguish between member and non-member stars of a cluster.Fil: Vergne, Maria Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; ArgentinaFil: Feinstein Baigorri, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; ArgentinaFil: Martinez, Ruben Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; ArgentinaFil: Orsatti, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; ArgentinaFil: Alvarez, María Paula. Universidad Nacional de la Plata. Facultad de Cs.astronomicas y Geofisicas. Observatorio Astronomica D/la Plata - Sede Central; Argentin
A Photometric Study of the Galactic Cluster NGC 6124
No full textAbstract. Magnitudes and colours on the B, V system are determined for stars in the galactic cluster NGC 6124, based on a photoelectric sequence measured by Koelbloed and an extension of this toward faint stars. The distance of the cluster is about 580 pcs. and the age somewhat more than 108 years. Ichtisar. Magnitudo dan warna dalam sistim B. V daripada bintang2 dalam gugus galaktik NGC 6124 telah ditentukan berdasarkan suatu deret photoelektrik jang diukur oleh Koelbloed dan perluasannja kepada bintang-bintang jang lemah tjahanja. Djarak daripada gugus itu telah ditentukan kira2 580 pc. dan usianja kira2 108 tahun lebih sedikit
Informe AN FR 6124 Froschtal To
No full textCSIC-Departamento de Medio Ambiente y Agronomía (MA-INIA)Informe final científico-técnico para la resolución de la autorización del producto biocida FR 6124 FROSCHTAL TO en relación a la evaluación llevada a cabo por ES, en cuanto a la evaluación del riesgo para el medio ambiente aprobado bajo el artículo 19.1 del Reglamento (UE) No 528/2012.Peer reviewe
SPC Español AN FR 6124 Froschtal To
No full textCSIC-Departamento de Medio Ambiente y Agronomía (MA-INIA)Informe en español de los términos y condiciones relativos a la comercialización y uso del biocida FR 6124 FROSCHTAL TO en relación a la evaluación medioambiental llevada a cabo por ES bajo el Reglamento (UE) No 528/2012.Peer reviewe
Oficio-1 FR 6124 Froschtal To
No full textCSIC-Departamento de Medio Ambiente y Agronomía (MA-INIA)Informe de validación de la solicitud de autorización en España del producto biocida FR 6124 FROSCHTAL TO en relación a la evaluación del riesgo medioambiental conforme el artículo 29.3 del Reglamento (UE) No 528/2012.Peer reviewe
Prosody and the structure of the message
No full textContains fulltext :
6124.pdf (Publisher’s version ) (Open Access
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