Predicting Stellar Angular Sizes

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 ($\sim$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 667C.

2 pages; to appear in the EAS Publications Series "Setting a New Standard in the Analysis of Binary Stars", Leuven, Belgium 2013

References in corpus (2)

• A dynamically-packed planetary system around GJ667C with three super-Earths in its habitable zone
• Stellar Diameters and Temperatures III. Main Sequence A, F, G, & K Stars: Additional high-precision measurements and empirical relations

Cited by in corpus (1)

• Planetary system architectures with low-mass inner planets: Direct imaging exploration of mature systems beyond 1 au