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Fundamental Properties of O and B Stars with Optical Interferometry

Published online by Cambridge University Press:  29 August 2024

Kathryn D. Gordon Open the ORCID record for Kathryn D. Gordon [Opens in a new window] ,
Douglas R. Gies Open the ORCID record for Douglas R. Gies [Opens in a new window]  and
Gail H. Schaefer
Kathryn D. Gordon*
Affiliation:
University of Tampa 401 W. Kennedy Blvd., Tampa, FL, USA
Douglas R. Gies*
Affiliation:
Georgia State University CHARA, Department of Physics and Astronomy, Atlanta, GA, USA
Gail H. Schaefer*
Affiliation:
The CHARA Array Mount Wilson, CA, USA
*
email: kgordon@ut.edu
email: dgies@gsu.edu
email: gschaefer@gsu.edu
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Abstract

We used interferometric observations made with the CHARA Array of 25 B-type stars and 6 O-type stars to obtain precise measurements of angular size, radius, and effective temperature to test stellar atmospheric models for massive stars. Our measured angular diameters range from 1.09 milli-arcseconds (mas) for β Tau down to 0.11 mas for 10 Lac, the smallest star yet resolved with the CHARA Array. The rotational oblateness of the rapidly rotating star ζ Oph is directly measured for the first time. We collected ultraviolet to infrared spectrophotometry for all sample stars and derived temperatures, angular diameters, and reddening estimates that best fit the spectra. There is generally good agreement between the observed and spectral fit angular diameters for the O and B stars, indicating that the fluxes predicted from model atmospheres are reliable. The derived and model temperatures for the O stars are also in fair agreement, however the sample size is small and several of the O stars results we consider to be preliminary. On the other hand, the temperatures derived from angular diameters and fluxes tend to be larger (by ≈ 4%) for the B stars than those from published results based on analysis of the line spectrum (Gordon et al. 2018, 2019).

Keywords

stars: early-typestars: fundamental parameters (classification, colors, luminosities, masses, radii, temperatures, etc.)techniques: interferometric
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 382 - 386
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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