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Angular Diameters of the G Subdwarf $\mu$ Cassiopeiae A and the K Dwarfs $\sigma$ Draconis and HR 511 from Interferometric Measurements with the CHARA Array

  • Boyajian, Tabetha S.
  • McAlister, Harold A.
  • Baines, Ellyn K.
  • Gies, Douglas R.
  • Henry, Todd
  • Jao, Wei-Chun
  • O'Brien, David
  • Raghavan, Deepak
  • Touhami, Yamina
  • Brummelaar, Theo A. ten
  • Farrington, Chris
  • Goldfinger, P. J.
  • Sturmann, Laszlo
  • Sturmann, Judit
  • Turner, Nils H.
  • Ridgway, Stephen
Publication Date
Apr 29, 2008
Submission Date
Apr 17, 2008
DOI: 10.1086/589554
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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.

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