First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars

Details First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars

2006-02-06

arxiv.org/abs/astro-ph/0602105v1

Astrophys.J. 644 (2006) 475-483

Astronomy and Astrophysics

Astrophysics

24 pages, 5 figures, accepted for publication in the ApJ

Scientific paper

10.1086/503318

We have measured the angular diameters of six M dwarfs with the CHARA Array, a long-baseline optical interferometer located at Mount Wilson Observatory. Spectral types range from M1.0 V to M3.0 V and linear radii from 0.38 to 0.69 Rsun. These results are consistent with the seven other M-dwarf radii measurements from optical interferometry and with those for sixteen stars in eclipsing binary systems. We compare all directly measured M dwarf radii to model predictions and find that current models underestimate the true stellar radii by up to 15-20%. The differences are small among the metal-poor stars but become significantly larger with increasing metallicity. This suggests that theoretical models for low mass stars may be missing some opacity source that alters the computed stellar radii.

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