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

被引：46

作者：

Boyajian, Tabetha S. ^{[1
]}

McAlister, Harold A. ^{[1
]}

Baines, Ellyn K. ^{[1
]}

Gies, Douglas R. ^{[1
]}

Henry, Todd ^{[1
]}

Jao, Wei-Chun ^{[1
]}

O'Brien, David ^{[1
]}

Raghavan, Deepak ^{[1
]}

Touhami, Yamina ^{[1
]}

ten Brummelaar, Theo A. ^{[2
]}

Farrington, Chris ^{[2
]}

Goldfinger, P. J. ^{[2
]}

Sturmann, Laszlo ^{[2
]}

Sturmann, Judit ^{[2
]}

Turner, Nils H. ^{[2
]}

Ridgway, Stephen ^{[3
]}

机构：

[1] Georgia State Univ, Ctr High Angular Resolut Astron, Atlanta, GA 30302 USA

[2] Mt Wilson Observ, CHARA Array, Mt Wilson, CA 91023 USA

[3] Natl Opt Astron Observ, Tucson, AZ 85726 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 683卷 / 01期

关键词：

infrared : stars; stars : fundamental parameters (temperatures; diameters stars : individual (HD 6582; HD; 185144; HR; 511; mu Cassiopeiae); subdwarfs; techniques : interferometric;

D O I：

10.1086/589554

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the longest baselines of the CHARA Array, we have measured the angular diameter of the G5V subdwarf mu CasA, 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-eff = 5297 +/- 32 K), radius (R = 0.791 +/- 0.008 R-circle dot), and absolute luminosity (L = 0.442 +/- 0: 014 L-circle dot) 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 mu Cas A, and we discuss these results and how they provide a key to understanding the fundamental relationships for stars with low metallicity.

引用

页码：424 / 432

页数：9

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