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Predicting Stellar Angular Sizes

Published online by Cambridge University Press:  25 February 2014

K. von Braun ,
T.S. Boyajian  and
G.T. van Belle
K. von Braun
Affiliation:
Max-Planck Institute for Astronomy (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
T.S. Boyajian
Affiliation:
Department of Astronomy, Yale University, New Haven, CT 06511, USA
G.T. van Belle
Affiliation:
Lowell Observatory, Flagstaff, AZ 86001, USA
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Abstract

Our survey of long-baseline infrared and optical interferometry measurements is producing considerable numbers of directly determined stellar angular sizes. We use our sample of 124 high-precision (5%) angular stellar diameter values and correlate them with stellar magnitude values from the literature to produce empirical relations for main-sequence stars between observed apparent magnitudes, stellar colors, and angular sizes (surface brightness relations). We find a significant dependence on stellar metallicity for (B − V) colors. The scatter in the calculated relations is small (∼5%), which makes them a robust tool for the prediction of main-sequence stellar angular sizes based on photometry. We apply these relations via the calculation of the radius of the multiplanet host star GJ 667 C.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 64: Setting a New Standard in the Analysis of Binary Stars , 2013 , pp. 429 - 430
Copyright
© EAS, EDP Sciences, 2014

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