201,291 research outputs found

    Examining the relationships between colour, T eff , and [M/H] for APOGEE K and M dwarfs

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    We present the effective temperatures (T-eff), metallicities, and colours in Sloan Digital Sky Survey (SDSS), Two Micron All Sky Survey, and Wide-field Infrared Survey Explorer filters, of a sample of 3834 late-K and early-M dwarfs selected from the SDSS Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectroscopic survey ASPCAP (APOGEE Stellar Parameters and Chemical Abundances Pipeline) catalogue. We confirm that ASPCAP T-eff values between 3550 < T-eff < 4200 K are accurate to similar to 100 K compared to interferometric T-eff values. In that same T-eff range, ASPCAP metallicities are accurate to 0.18 dex between -1.0 <[M/H]< 0.2. For these cool dwarfs, nearly every colour is sensitive to both T-eff and metallicity. Notably, we find that g - r is not a good indicator of metallicity for near-solar metallicity early-M dwarfs. We confirm that J - K-S colour is strongly dependent on metallicity, and find that W1 - W2 colour is a promising metallicity indicator. Comparison of the late-K and early-M dwarf colours, metallicities, and T-eff to those from three different model grids shows reasonable agreement in r - z and J - K-S colours, but poor agreement in u - g, g - r, and W1 - W2. Comparison of the metallicities of the KM dwarf sample to those from previous colour-metallicity relations reveals a lack of consensus in photometric metallicity indicators for late-K and early-M dwarfs. We also present empirical relations for T-eff as a function of r - z colour combined with either [M/H] or W1 - W2 colour, and for [M/H] as a function of r - z and W1 - W2 colour. These relations yield T-eff to similar to 100 K and [M/H] to similar to 0.18 dex precision with colours alone, for T-eff in the range of 3550-4200 K and [M/H] in the range of -0.5-0.2.NSF [AST-0807997]; Alfred P. Sloan Foundation; National Science Foundation; US Department of Energy Office of Science; University of Arizona; Brazilian Participation Group; Brookhaven National Laboratory; Carnegie Mellon University; University of Florida; French Participation Group; German Participation Group; Harvard University; Instituto de Astrofisica de Canarias; Michigan State/Notre Dame/JINA Participation Group; Johns Hopkins University; Lawrence Berkeley National Laboratory; Max Planck Institute for Astrophysics; Max Planck Institute for Extraterrestrial Physics; New Mexico State University; New York University; Ohio State University; Pennsylvania State University; University of Portsmouth; Princeton University; Spanish Participation Group; University of Tokyo; University of Utah; Vanderbilt University; University of Virginia; University of Washington; Yale University; National Aeronautics and Space AdministrationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

    Standard errors of model fit (M<i><sub>eff</sub></i>).

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    <p>a) walk; b) slow run. Black markers denote forelimb data; blue markers denote hind limb data. The corresponding shaded areas show two standard errors from the fitted model. Although the intersection suggests that smaller species (below ∼750 kg M<sub>b</sub>) have greater forelimb M<i><sub>eff</sub>,</i> whereas larger species appeared to have greater hind limb M<i><sub>eff</sub></i>, the standard errors associated with model fitting mean these limb differences are not statistically significant.</p

    EFF: calibration and reduction program for the Effelsberg 100 m telescope

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    EFF is a program for converting the raw data obtained with the Effelsberg 100-meter telescope into CLASS format. As CLASS deals with calibrated data, EFF includes also a calibration of the raw data. EFF uses the SIC command monitor, and includes the whole CLASS language, so that EFF can be used instead of CLASS for reducing the data converted in CLASS format. It is then recommended to the reader non familiar with CLASS to consult first the CLASS manual. EFF is very simple to use to convert data taken with some 'standard' procedures (see section 3.), but can also be used with data taken in non standard way. EFF can also be used as the on-line display program in connection with the OBS_E program. (orig.)SIGLEAvailable from TIB Hannover: RN 4260(76)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

    On the triangulated category of framed motives DFreff(k)\text{DFr}_{-}^{eff}(k)

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    The category of framed correspondences Fr(k)Fr_*(k) was invented by Voevodsky in his notes in order to give another framework for SH(k) more amenable to explicit calculations. Based on that notes and on their JAMS paper Garkusha and the author introduced in a very recent paper a triangulated category of framed bispectra SHnisfr(k)\text{SH}_{nis}^{fr}(k). It is shown in the latter paper that SHnisfr(k)\text{SH}_{nis}^{fr}(k) recovers classical Morel-Voevodsky triangulated category of bispectra SH(k)\text{SH}(k). For any infinite perfect field kk a triangulated category of Fr\mathbb{F}\text{r}-motives DFreff(k)\text{D}\mathbb{F}\text{r}_{-}^{eff}(k) is constructed in the style of the Voevodsky construction of the category DMeff(k)\text{DM}_-^{eff}(k). In our approach the Voevodsky category of Nisnevich sheaves with transfers is replaced with the category of Fr\mathbb{F}\text{r}-modules. To each smooth kk-variety XX the Fr\mathbb{F}\text{r}-motive MFr(X)\text{M}_{\mathbb{F}\text{r}}(X) is associated in the category DFreff(k)\text{D}\mathbb{F}\text{r}_{-}^{eff}(k). We identify the triangulated category DFreff(k)\text{D}\mathbb{F}\text{r}_{-}^{eff}(k) with the full triangulated subcategory SHeff(k)\text{SH}^{eff}_{-}(k) of the classical Morel-Voevodsky triangulated category SHeff(k)\text{SH}^{eff}(k) of effective motivic bispectra. Moreover, the triangulated category DFreff(k)\text{D}\mathbb{F}\text{r}_{-}^{eff}(k) is naturally symmetric monoidal. The mentioned identification of the triangulated categories respects the symmetric monoidal structures on both sides.Comment: Over the next week several discussions on the topic of this preprint is expected during the conference in the memory of A.N.Parshin. arXiv admin note: text overlap with arXiv:1302.2163, arXiv:1108.037

    Solution structure of ChxR<sub>Eff</sub>.

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    <p><i>A,</i> Cartoon ribbon diagram of the minimized mean structure of <i>C. trachomatis</i> ChxR<sub>Eff</sub> (residues 114–229) colored blue (N-terminus) to red (C-terminus). The topology of ChxR<sub>Eff</sub> is β6–β7–β8–β9–α4–β10–α5–α6–α7–β11–β12. <i>B,</i> Surface representation of electrostatic potential, generated by DelPhi <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0091760#pone.0091760-Rocchia1" target="_blank">[40]</a>, of ChxR<sub>Eff</sub>. Color scheme represents regions of negative (<i>red</i>) and positive (<i>blue</i>) charge density contoured at ±3 <i>e</i>/<i>kT</i>. Structure is oriented the same as panel A. <i>C,</i> Surface representation of ChxR<sub>Eff</sub> with surface exposed side chains targeted for site directed mutagenesis colored magenta. Structure is oriented the same as panel A. All three panels are rotated 180° on the <i>right</i>.</p

    Dr. Duane M. Jackson, Morehouse College, July 2011

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    This video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer

    "Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.

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    "Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states. By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement. To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
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