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 667C.
@article{arxiv.1311.2523,
title = {Predicting Stellar Angular Sizes},
author = {Kaspar von Braun and Tabetha S. Boyajian and Gerard T. van Belle},
journal= {arXiv preprint arXiv:1311.2523},
year = {2014}
}
Comments
2 pages; to appear in the EAS Publications Series "Setting a New Standard in the Analysis of Binary Stars", Leuven, Belgium 2013