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Angular Diameters of O- and B-type Stars

Published online by Cambridge University Press:  23 January 2015

Kathryn Gordon
Affiliation:
Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302, USA email: kgordon@chara.gsu.edu
Douglas Gies
Affiliation:
Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302, USA email: kgordon@chara.gsu.edu
Gail Schaefer
Affiliation:
The CHARA Array of Georgia State University, Mt. Wilson, CA 91023, USA
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Abstract

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We are observing a sample of 10 O-type stars and 60 B-type stars to determine angular diameters using the Center for High Angular Resolution Astronomy (CHARA) Array, the foremost optical long baseline interferometer in the world. Our goal is to establish accurate stellar parameters to test modern theories of stellar evolution that include rotation. We will combine our stellar angular diameter measurements with flux and line measurements from spectroscopy, projected rotational velocities, and distances to determine radius, effective temperature, luminosity, equatorial rotational velocity, and evolutionary mass. Knowing these properties will allow us to place the stars in a Hertzsprung-Russell diagram and obtain estimates for the age and evolutionary state.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Brott, I., de Mink, S. E., Cantiello, M., et al. 2011, A&A 530, A115Google Scholar
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Ireland, M. J., Mérand, A., ten Brummelaar, T. A., et al. 2008, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, Vol. 7013 of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference SeriesGoogle Scholar
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ten Brummelaar, T. A., McAlister, H. A., Ridgway, S. T., et al. 2005, ApJ 628, 453CrossRefGoogle Scholar
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