Bibcode
Bilir, S.; Karaali, S.; Ak, S.; Coşkunoğlu, K. B.; Yaz, E.; Cabrera-Lavers, A.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 3, pp. 1589-1595.
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7
2009
Citations
16
Refereed citations
15
Description
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] <= 0.20dex), age (0 <= t <=
10Gyr) and surface gravity (logg > 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.
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