Our Nearest 15 Million Neighbors: The Field Low-Mass Stellar Luminosity and Mass Functions

Details Our Nearest 15 Million Neighbors: The Field Low-Mass Stellar Luminosity and Mass Functions Our Nearest 15 Million Neighbors: The Field Low-Mass Stellar Luminosity and Mass Functions

2008-10-14

arxiv.org/abs/0810.2343v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Included in the proceedings of Cool Stars 15

Scientific paper

10.1063/1.3099284

We report on a new measurement of the luminosity function (LF) and mass function (MF) of field low-mass dwarfs using Sloan Digital Sky Survey (SDSS) photometry. The final catalog is composed of ~15 million low-mass stars (0.1 Msun < M < 0.8 Msun), spread over 8,400 square degrees. Distances to the stars are estimated using new photometric parallax relations, constructed from ugriz photometry of nearby low-mass stars with trigonometric parallaxes. The LF is measured with a novel technique, which simultaneously measures Galactic structure and the stellar LF. The resulting LF is compared to previous studies and converted to a MF. The MF is well-described by a log-normal distribution, with Mo = 0.27 Msun.

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