The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 43 Issue 2
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- Pages.59.2-59.2
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- 2018
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- 1226-2692(pISSN)
Metal-Poor F-G-K type Local Subdwarfs From SDSS + GAIA GR2: Spectrophotometric & Kinematic Properties
- Yang, Soung-Chul (Korea Astronomy & Space Science Institute) ;
- Kim, Young Kwang (Department of Astronomy & Space Science, Chungnam National University) ;
- Lee, Young Sun (Department of Astronomy & Space Science, Chungnam National University) ;
- Lee, Hogyu (Korea Astronomy & Space Science Institute)
- Published : 2018.10.10
Abstract
We introduce a new project of constructing a large spectro-photometric samples of metal-poor (i.e. [Fe/H] < -1.0) subdwarfs in the Galactic halo. The sample is collected from a compilation of the stellar objects that are cross-identified both in the Sloan Digital Sky Survey (SDSS) and recently published data from GAIA mission. The color range of the selected stars covers 0.0 < (g-r) < 2.0; thus the spectral types of our sample span from early F- through late K-type stars on the metal-poor main sequence (i.e. the local subdwarf sequence). We scrutinized the physical, chemical, and kinematical properties of our samples using their SDSS medium-resolution (R ~ 2000) spectra, combined with accurately measured proper motions from GAIA satellite. Our study will provide useful information on the global trend in the various properties (e.g. abundance pattern as a function of the galactocentric distance; rotational velocity vs [Fe/H]
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