期刊
ASTRONOMICAL JOURNAL
卷 139, 期 6, 页码 2679-2699出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/139/6/2679
关键词
brown dwarfs; Galaxy: stellar content; Galaxy: structure; stars: fundamental parameters; stars: late-type; stars: low-mass; stars: luminosity function, mass function
资金
- UW Astronomy department
- NSF [AST 02-05875, AST 06-07644]
- NASA ADP [NAG5-13111]
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0909463] Funding Source: National Science Foundation
We report on new measurements of the luminosity function (LF) and mass function (MF) of field low-mass dwarfs derived from Sloan Digital Sky Survey Data Release 6 photometry. The analysis incorporates similar to 15 million low-mass stars (0.1 M(circle dot) < M < 0.8 M(circle dot)), spread over 8400 deg(2). Stellar distances are estimated using new photometric parallax relations, constructed from ugriz photometry of nearby low-mass stars with trigonometric parallaxes. We use a technique that simultaneously measures Galactic structure and the stellar LF from 7 < M(r) < 16. We compare the LF to previous studies and convert to an MF using the mass-luminosity relations of Delfosse et al. The system MF, measured over -1.0 < log M/M(circle dot) < -0.1, is well described by a lognormal distribution with M(circle dot) = 0.25 M(circle dot). We stress that our results should not be extrapolated to other mass regimes. Our work generally agrees with prior low-mass stellar MFs and places strong constraints on future theoretical star formation studies.
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