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American Astronomical Society, Astrophysical Journal, 1(683), p. 424-432, 2008

DOI: 10.1086/589554

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Angular Diameters of the G Subdwarf μ Cassiopeiae A and the K Dwarfs σ Draconis and HR 511 from Interferometric Measurements with the CHARA Array

Journal article published in 2008 by Tabetha S. Boyajian ORCID, Harold A. McAlister, Ellyn K. Baines, Douglas R. Gies, Todd Henry, Wei-Chun Jao, David O'Brien, Deepak Raghavan, Theo A. ten Brummelaar, David O’Brien, Yamina Touhami, Chris Farrington, P. J. Goldfinger, Laszlo Sturmann, Nils H. Turner and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Using the longest baselines of the CHARA Array, we have measured the angular diameter of the G5 V subdwarf μ Cas A, the first such determination for a halo population star. We compare this result to new diameters for the higher metallicity K0 V stars, σ Dra and HR 511, and find that the metal-poor star, μ Cas A, has an effective temperature (Teff = 5297 ± 32 K), radius (R = 0.791 ± 0.008 R☉), and absolute luminosity (L = 0.442 ± 0.014 L☉) comparable to those of the other two stars with later spectral types. We show that stellar models show a discrepancy in the predicted temperature and radius for μ Cas A, and we discuss these results and how they provide a key to understanding the fundamental relationships for stars with low metallicity.