First Results from the CHARA Array. IV. The Interferometric Radii of Low‐Mass Stars
- 10 June 2006
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 644 (1), 475-483
- https://doi.org/10.1086/503318
Abstract
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 R☉. These results are consistent with the seven other M dwarf radii measurements from optical interferometry and with those for 14 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.Keywords
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