SDSS absolute magnitudes for thin-disc stars based on trigonometric parallaxes
SDSS absolute magnitudes for thin-disc stars based on trigonometric parallaxes
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基于三角视差的薄盘星 SDSS 绝对星等
DOI：
10.1111/j.1365-2966.2009.14816.x
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发表时间：
2009
影响因子：
4.8
通讯作者：
A. Cabrera
中科院分区：
文献类型：
--
作者：
S. Bilir;S. Karaali;S. Ak;K. B. Coskunoglu;E. Yaz;A. Cabrera
We present a new luminosity-colour relation based on trigonometric parallaxes for thin disc main-sequence stars in SDSS photometry. We matched stars from the newly reduced Hipparcos catalogue with the ones taken from 2MASS All-Sky Catalogue of Point Sources, and applied a series of constraints, i.e. relative parallax errors (σ�/π 6 0.05), metallicity ( 0.30 6 [M/H] 6 0.20 dex), age (0 6 t 6 10 Gyr) and surface gravity (log g > 4), and obtained a sample of thin disc main-sequence stars. Then, we used our previous transformation equations (Bilir et al. 2008a) between SDSS and 2MASS photometries and calibrated the Mg absolute magnitudes to the (g r)0 and (r i)0 colours. The transformation formulae between 2MASS and SDSS photometries along with the absolute magnitude calibration provide space densities for bright stars which saturate the SDSS magnitudes.
