Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-17
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/589554
Using the longest baselines of the CHARA Array, we have measured the angular diameter of the G5 V subdwarf $\mu$ 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, $\sigma$ Dra and HR 511, and find that the metal-poor star, $\mu$ Cas A, has an effective temperature ($T_{\rm eff}=5297\pm32$ K), radius ($R=0.791\pm0.008 R_{\rm \odot}$), and absolute luminosity ($L=0.442\pm0.014 L_{\rm \odot}$) comparable to the other two stars with later spectral types. We show that stellar models show a discrepancy in the predicted temperature and radius for $\mu$ Cas A, and we discuss these results and how they provide a key to understanding the fundamental relationships for stars with low metallicity.
Baines Ellyn K.
Boyajian Tabetha S.
Farrington Chris
Gies Douglas R.
Goldfinger P. J.
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