SDSS Absolute Magnitudes for Thin Disc Stars based on Trigonometric Parallaxes

Details SDSS Absolute Magnitudes for Thin Disc Stars based on Trigonometric Parallaxes SDSS Absolute Magnitudes for Thin Disc Stars based on Trigonometric Parallaxes

2009-03-23

arxiv.org/abs/0903.3965v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

7 pages, including 7 figures and 2 tables, accepted for publication in MNRAS

Scientific paper

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 ($\sigma_{\pi}/\pi\leq0.05$), metallicity ($-0.30\leq[M/H]\leq0.20$ dex), age ($0\leq t \leq 10$ 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 $M_{g}$ 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.

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