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Finding Cool Subdwarfs Using a V−J Reduced Proper‐Motion Diagram: Stellar Parameters for 91 Candidates

David Yong and David L. Lambert
Publications of the Astronomical Society of the Pacific
Vol. 115, No. 809 (July 2003), pp. 796-806
DOI: 10.1086/376398
Stable URL: http://www.jstor.org/stable/10.1086/376398
Page Count: 11
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Abstract

ABSTRACT We present the results of a search for cool subdwarfs for which our candidates were drawn from a V−J reduced proper‐motion diagram constructed by Salim & Gould. Kinematic (U, V, and W) and self‐consistent stellar parameters (Teff, log g, [Fe/H], and \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\xi _{t}$ \end{document} ) are derived for 91 candidate subdwarfs based on high‐resolution spectra. The observed stars span 3900 K < Teff <  6200 K and −2.63 < [Fe/H] < 0.25 including only three giants (log g < 4.0). Of the sample, 77 stars have MgH lines present in their spectra. With more than 56% of our candidate subdwarfs having [Fe/H] ≤ −1.5, we show that the V−J reduced proper‐motion diagram readily identifies metal‐poor stars.

Notes and References

This item contains 50 references.

REFERENCES
  • ['Alibés, A., Labay, J., & Canal, R. 2001, A&A, 370, 1103']
  • ['Alonso, A., Arribas, S., & Martínez‐Roger, C. 1996, A&A, 313, 873']
  • ['———. 1999, A&AS, 140, 261']
  • ['Beers, T. C., Preston, G. W., & Shectman, S. A. 1992, AJ, 103, 1987']
  • ['Bond, H. E. 1970, ApJS, 22, 117']
  • ['Burgasser, A. J., et al. 2003, ApJ in press (astro‐ph/0304174)']
  • ['Carney, B. W. 1979, ApJ, 233, 211']
  • ['Carney, B. W., Latham, D. W., Laird, J. B., & Aguilar, L. A. 1994, AJ, 107, 2240']
  • ['Christlieb, N. 2000, Ph.D. thesis, Univ. Hamburg']
  • ['Cottrell, P. L. 1978, ApJ, 223, 544']
  • ['Dehnen, W., & Binney, J. J. 1998, MNRAS, 298, 387']
  • ['Delbouille, L., Roland, G., & Neven, L. 1973, Photometric Atlas of the Solar Spectrum from 3000 to 10000 Å (Liège: Univ. Liège Inst. d’Astrophys.)']
  • ['Delfosse, X., Tinney, C. G., Forveille, T., Epchtein, N., Borsenberger, J., Fouqué, P., Kimeswenger, S., & Tiphène, D. 1999, A&AS, 135, 41']
  • ['Edvardsson, B., Andersen, J., Gustafsson, B., Lambert, D. L., Nissen, P. E., & Tomkin, J. 1993, A&A, 275, 101']
  • ['ESA. 1997, The Hipparcos and Tycho Catalogues (ESA‐SP 1200; Noordwijk: ESA)']
  • ['Gay, P. L., & Lambert, D. L. 2000, ApJ, 533, 260']
  • ['Gizis, J. E. 1997, AJ, 113, 806']
  • ['Goswami, A., & Prantzos, N. 2000, A&A, 359, 191']
  • ['Gould, A., & Salim, S. 2003, ApJ, 582, 1001']
  • ['Grevesse, N., & Sauval, A. J. 1999, A&A, 347, 348']
  • ['Hauschildt, P. H., Allard, F., & Baron, E. 1999, ApJ, 512, 377']
  • ['Hawley, S. L., et al. 2002, AJ, 123, 3409']
  • ['Johnson, D. R. H., & Soderblom, D. R. 1987, AJ, 93, 864']
  • ['Jørgensen, U. G. 1994, A&A, 284, 179']
  • ['Kurucz, R. 1993, Kurucz CD‐Rom 13, ATLAS9 Stellar Atmosphere Programs and 2 km/s Grid (Cambridge: Smithsonian Astrophys. Obs.)']
  • ['Lambert, D. L., Heath, J. E., Lemke, M., & Drake, J. 1996, ApJS, 103, 183']
  • ['Lépine, S., Shara, M. M., & Rich, R. M. 2003, ApJ, 585, L69']
  • ['Luyten, W. J. 1979, New Luyten Catalogue of Stars with Proper Motions Larger than Two Tenths of an Arcsecond (Minneapolis: Univ. Minnesota)']
  • ['———. 1980, New Luyten Catalogue of Stars with Proper Motions Larger than Two Tenths of an Arcsecond (Minneapolis: Univ. Minnesota)']
  • ['Luyten, W. J., & Hughes, H. S. 1980, Proper Motion Survey with the Forty‐Eight Inch Schmidt Telescope. LV. First Supplement to the NLTT Catalogue (Minneapolis: Univ. Minnesota)']
  • ['McWilliam, A., Preston, G. W., Sneden, C., & Searle, L. 1995, AJ, 109, 2757']
  • ['Monet, D. B. A., et al. 1998, AAS Meeting, 193, 120.03']
  • ['Reddy, B. E., Tomkin, J., Lambert, D. L., & Allende Prieto, C. 2003, MNRAS, 340, 304']
  • ['Reid, I. N., & Cruz, K. L. 2002, AJ, 123, 2806']
  • ['Roman, N. G. 1955, ApJS, 2, 195']
  • ['Ryan, S. G. 1989, AJ, 98, 1693']
  • ['Ryan, S. G., & Norris, J. E. 1991, AJ, 101, 1835']
  • ['Ryan, S. G., Norris, J. E., & Beers, T. C. 1996, ApJ, 471, 254']
  • ['Salim, S., & Gould, A. 2000, ApJ, 539, 241']
  • ['———. 2002, ApJ, 575, L83']
  • ['———. 2003, ApJ, 582, 1011']
  • ['Sandage, A., & Kowal, C. 1986, AJ, 91, 1140']
  • ['Schwarzschild, M., Searle, L., & Howard, R. 1955, ApJ, 122, 353']
  • ['Schweitzer, A., Scholz, R.‐D., Stauffer, J., Irwin, M., & McCaughrean, M. J. 1999, A&A, 350, L62']
  • ['Skrutskie, M. F., et al. 1997, in The Impact of Large Scale Near‐IR Sky Surveys, ed. F. Garzón et al. (Astrophys. and Space Sci. Library 210; Dordrecht: Kluwer), 25']
  • ['Sneden, C. 1973, ApJ, 184, 839']
  • ['Timmes, F. X., Woosley, S. E., & Weaver, T. A. 1995, ApJS, 98, 617']
  • ['Tull, R. G., MacQueen, P. J., Sneden, C., & Lambert, D. L. 1995, PASP, 107, 251']
  • ['Yi, S., Demarque, P., Kim, Y., Lee, Y., Ree, C. H., Lejeune, T., & Barnes, S. 2001, ApJS, 136, 417']
  • ['Yong, D., & Lambert, D. L. 2003, PASP, 115, 22 (Paper I)']