Photometry of O-type stars, interpreted with reference to model atmospheres
Stromgren-system colors for O-type stars have been compared with colors calculated by Mihalas from non-LTE model atmospheres and by Mihalas and Hummer from models with extended geometry. Within the accuracy of the observations, effective temperatures derived from the photometry for main-sequence stars agree with those derived by Conti from a ratio of intensities of spectral lines; consistency of the calculated colors with the calculated strengths of the lines is demonstrated for the non-LTE plane-parallel models. For Of stars of luminosity classes III and I, and O stars of luminosity class I, c$sub 1$ is consistently more negative than it is for main-sequence stars by an amount that is consistent with the predictions of the models with extended geometry. For stars earlier than type 06, c$sub 1$ is consistently more positive than the plane parallel models predict, and possible reasons for this effect are discussed.
- Research Organization:
- Institute for Astronomy, University of Hawaii, Honolulu
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-003767
- OSTI ID:
- 4199700
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Vol. 200; ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
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