Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..704h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 704-708.
Astronomy and Astrophysics
Astrophysics
20
Early Stars, Hot Stars, Line Spectra, Stellar Atmospheres, Stellar Temperature, Energy Distribution, Error Analysis, O Stars, Thermodynamic Equilibrium
Scientific paper
The authors demonstrate that for hot stars (Teff > 30,000K) methods based on the integrated continuum flux are completely unreliable discriminators of the effective temperature. They show that the observed continuum flux distribution of ζ Pup (O4f) can be fitted to within the observational errors by photospheric models having a wide range of effective temperatures and gravities. In contrast, absorption line profiles provide much more accurate values of these parameters. As an example, profiles of weak lines of H I, He I, and He II are computed from standard non-LTE models at the effective temperature and surface gravity inferred by Underhill from the continuous energy flux. These profiles show a severe lack of agreement with observed profiles.
Abbott David C.
Bohannan Bruce
Hummer David G.
Voels Stephen A.
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