期刊
ASTROPHYSICAL JOURNAL
卷 757, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/757/1/42
关键词
binaries: eclipsing; stars: evolution; stars: fundamental parameters; stars: low-mass; starspots
资金
- National Science Foundation (NSF) [AST-0908345]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908345] Funding Source: National Science Foundation
We examine the agreement between the observed and theoretical low-mass (<0.8 M-circle dot) stellar main-sequence mass-radius relationship by comparing detached eclipsing binary (DEB) data with a new, large grid of stellar evolution models. The new grid allows for a realistic variation in the age and metallicity of the DEB population, characteristic of the local galactic neighborhood. Overall, our models do a reasonable job of reproducing the observational data. A large majority of the models match the observed stellar radii to within 4%, with a mean absolute error of 2.3%. These results represent a factor of two improvement compared to previous examinations of the low-mass mass-radius relationship. The improved agreement between models and observations brings the radius deviations within the limits imposed by potential starspot-related uncertainties for 92% of the stars in our DEB sample.
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