SDSS Absolute Magnitudes for Thin Disc Stars based on Trigonometric Parallaxes - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: We present a new luminosity-colour relation based on trigonometric parallaxesfor thin disc main-sequence stars in SDSS photometry. We matched stars from thenewly reduced Hipparcos catalogue with the ones taken from 2MASS All-SkyCatalogue of Point Sources, and applied a series of constraints, i.e. relativeparallax errors $\sigma {\pi}-\pi\leq0.05$, metallicity$-0.30\leqM-H\leq0.20$ 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, weused our previous transformation equations Bilir et al. 2008a between SDSSand 2MASS photometries and calibrated the $M {g}$ absolute magnitudes to the$g-r {0}$ and $r-i 0$ colours. The transformation formulae between 2MASSand SDSS photometries along with the absolute magnitude calibration providespace densities for bright stars which saturate the SDSS magnitudes.



Author: S. Bilir, S. Karaali, S. Ak, K. B. Coskunoglu, E. Yaz, A. Cabrera-Lavers

Source: https://arxiv.org/



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