2009/03/23 by S. Bilir, S. Karaali, S. Ak +5 · 18 citations
Engineering · Physics and Astronomy · #Absolute magnitude #Astronomical Observations and Instrumentation #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Metallicity #Parallax #Photometry (optics) #Physics #Sigma #Sky #Stars #Stellar, planetary, and galactic studies #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.1111/j.1365-2966.2009.14816.x
published in Monthly Notices of the Royal Astronomical Society 396(3), 1589-1595 (Oxford University Press) · 7 pages, including 7 figures and 2 tables, accepted for publication in MNRAS
arxiv created 2009/03/23 · openalex publication_date 2009/05/13 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 (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.