Fundamental Properties of Cool Stars with Interferometry

Details Fundamental Properties of Cool Stars with Interferometry Fundamental Properties of Cool Stars with Interferometry

2010-12-02

arxiv.org/abs/1012.0542v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Contribution to Proceedings of Cool Stars 16 Workshop; 8 pages in ASP format; 9 figures

Scientific paper

We present measurements of fundamental astrophysical properties of nearby, low-mass, K- and M-dwarfs from our DISCOS survey (DIameterS of COol Stars). The principal goal of our study is the determination of linear radii and effective temperatures for these stars. We calculate their radii from angular diameter measurements using the CHARA Array and Hipparcos distances. Combined with bolometric flux measurements based on literature photometry, we use our angular diameter results to calculate their effective surface temperatures. We present preliminary results established on an assortment of empirical relations to the stellar effective temperature and radius that are based upon these measurements. We elaborate on the discrepancy seen between theoretical and observed stellar radii, previously claimed to be related to stellar activity and/or metallicity. Our preliminary conclusion, however, is that convection plays a larger role in the determination of radii of these late-type stars. Understanding the source of the radius disagreement is likely to impact other areas of study for low-mass stars, such as the detection and characterization of extrasolar planets in the habitable zones.

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