Journal Article

SDSS absolute magnitudes for thin–disc stars based on trigonometric parallaxes

S. Bilir, S. Karaali, S. Ak, K. B. Coşkunoğlu, E. Yaz and A. Cabrera–Lavers

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1589-1595
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14816.x
SDSS absolute magnitudes for thin–disc stars based on trigonometric parallaxes

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We present a new luminosity–colour relation based on trigonometric parallaxes for thin–disc main–sequence stars in Sloan Digital Sky Survey (SDSS) photometry. We matched stars from the newly reduced Hipparcos catalogue with the ones taken from Two–Micron All–Sky Survey (2MASS) All–Sky Catalogue of Point Sources, and applied a series of constraints, i.e. relative parallax errors (σπ/π≤ 0.05), metallicity (−0.30 ≤[M/H]≤ 0.20 dex), age (0 ≤t≤ 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 (gr)0 and (ri)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.

Keywords: stars: distances; Galaxy: disc; solar neighbourhood

Journal Article.  3740 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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