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Effective Temperatures and Gravities for O-Type Stars Determined from High Precision Line Profiles and Wind-Blanketed Model Atmospheres

Published online by Cambridge University Press:  19 July 2016

B. Bohannan ,
S. A. Voels ,
D. C. Abbott  and
D. G. Hummer
B. Bohannan
Affiliation:
Joint Institute for Laboratory Astrophysics, Astrophysical, Planetary and Atmospheric Sciences, University of Colorado, Boulder, Colorado, U.S.A.
S. A. Voels
Affiliation:
Joint Institute for Laboratory Astrophysics, Astrophysical, Planetary and Atmospheric Sciences, University of Colorado, Boulder, Colorado, U.S.A.
D. C. Abbott
Affiliation:
Joint Institute for Laboratory Astrophysics, Astrophysical, Planetary and Atmospheric Sciences, University of Colorado, Boulder, Colorado, U.S.A.
D. G. Hummer
Affiliation:
Joint Institute for Laboratory Astrophysics, Astrophysical, Planetary and Atmospheric Sciences, University of Colorado, Boulder, Colorado, U.S.A.

Extract

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Analysis of line profiles obtained with astronomical instrumentation capable of high signal-to-noise ratio spectroscopy have contributed significant new precision to the determination of the basic stellar parameters of hot, luminous, mass-loosing stars. Accurate measurement of such stellar properties as effective temperature and helium abundance for stars of spectral type O and early B is important not only to the physics of these stars but also to the environment in which they are located. The overall goals of the work we summarize here are to refine the spectral-type vs. temperature calibration for the most massive stars and to determine helium abundances for stars that are loosing mass at a rate sufficiently high to affect their evolution. Details of our procedures are described in the analysis of ξ Puppis by Bohannan et al. (1986).

Type
III. Stars
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 127 - 130
Copyright
Copyright © Kluwer 1988 

References

Abbott, D. C. and Hummer, D. G. 1985, Ap. J. 294, 286.CrossRefGoogle Scholar
Bohannan, B., Abbott, D. C., Voels, S. A., Hummer, D. G. 1986, Ap. J. 308, 728.Google Scholar
Bohannan, B., Voels, S. A., Abbott, D. C., Hummer, D. G. 1988, submitted to Ap. J. Conti, P. S. 1973, Ap. J. 179, 161.Google Scholar
Hummer, D. G. 1982, Ap. J. 257, 724.CrossRefGoogle Scholar
Hummer, D. G., Voels, S. A., Abbott, D. C., Bohannan, B. 1988, submitted to Ap. J. Mihalas, D. 1972, NCAR TN/STR-76, Non-LTE Model Atmospheres of B and O Stars. Google Scholar