2008ApJ...683..424B

Query : 2008ApJ...683..424B

2008ApJ...683..424B - Astrophys. J., 683, 424-432 (2008/August-2)

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.

BOYAJIAN T.S., McALISTER H.A., BAINES E.K., GIES D.R., HENRY T., JAO W.-C., O'BRIEN D., RAGHAVAN D., TOUHAMI Y., TEN BRUMMELAAR T.A., FARRINGTON C., GOLDFINGER P.J., STURMANN L., STURMANN J., TURNER N.H. and RIDGWAY S.

Abstract (from CDS):

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.

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Journal keyword(s): Infrared: Stars - stars: fundamental parameters (temperatures, diameters) - stars: individual (HD 6582) - stars: individual (HD 185144) - stars: individual (HR 511) - stars: individual (µ Cassiopeiae) - Stars: Subdwarfs - Techniques: Interferometric

VizieR on-line data: <Available at CDS (J/ApJ/683/424): table1.dat>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 6210 PM* 01 04 19.4510863152 +61 34 48.662237964   6.386 5.833     F6V 91 0
2 * mu. Cas SB* 01 08 16.3029454473 +54 55 12.561201263 5.93 5.86 5.17 4.55 4.13 G5Vb 593 1
3 HD 10780 BY* 01 47 44.8344358038 +63 51 09.011001993 6.84 6.44 5.63 4.99 4.60 K0V 384 0
4 * sig Dra PM* 19 32 21.5902098601 +69 39 40.235805206 5.860 5.460 4.680 4.04 3.63 K0V 691 0
5 HD 193664 PM* 20 17 31.3281112685 +66 51 13.280468798   6.51   5.6   G3V 212 0

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