Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/683/424    CHARA observations of 3 late-type stars (Boyajian+, 2008)

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., Ridgway S. <Astrophys. J., 683, 424-432 (2008)> =2008ApJ...683..424B
ADC_Keywords: Stars, late-type ; Interferometry Keywords: infrared: stars - subdwarfs - techniques: interferometric - stars: fundamental parameters (temperatures, diameters) - stars: individual (HD 6582, HD 185144, HR 511, µ Cassiopeiae) Abstract: Using the longest baselines of the CHARA Array, we have measured the angular diameter of the G5V subdwarf µ Cas A, the first such determination for a halo population star. We compare this result to new diameters for the higher metallicity K0V stars, σ Dra and HR 511, and find that the metal-poor star, µ Cas A, has an effective temperature (Teff=5297±32K), radius (R=0.791±0.008R), and absolute luminosity (L=0.442±0.014L) 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. Description: Observations were taken using the CHARA Array, located on Mount Wilson, CA, and remotely operated from the Georgia State University AROC (Arrington Remote Operations Center) facility in Atlanta, GA. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 01 08 16.4 +54 55 13 HR 321 = µ Cas A = HD 6582 01 47 44.8 +63 51 09 HR 511 = HD 10780 = V* V987 Cas 19 32 21.6 +69 39 40 HR 7462 = σ Dra = HD 185144 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 52 63 Interferometric measurements
See also: VI/46 : Second Catalog of Interferometric Measurements of Binary Stars Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- HR HR (Bright Star) number of star 6- 16 A11 --- Name Star name 18- 28 F11.3 d JD Julian Date of observation 30- 34 F5.1 m B Projected baseline 36- 40 F5.1 deg psi Orientation of the baseline on the sky 42- 46 F5.3 --- V Visibility (1) 48- 52 F5.3 --- e_V The 1σ error in V
Note (1): Corrected for light from secondary for µ Cas A, see Section 3.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Dec-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact