Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..963u&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 15, 1981, p. 963-988.
Other
69
Early Stars, Hot Stars, Stellar Atmospheres, Stellar Evolution, Stellar Spectra, Supergiant Stars, Wolf-Rayet Stars, Astrometry, Atmospheric Models, B Stars, Hertzsprung-Russell Diagram, Interstellar Matter, O Stars, Radii, Stellar Luminosity, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
Effective temperatures, radii, and luminosities were determined from S2/68, ANS, UBV, and uvby photometry for four B0/B1 supergiants, four O4 stars, and four WN7/WN8 stars as well as for four test stars having spectral types between B1.5 V and 09 V and five stars with known angular diameters and effective temperatures. The effective temperatures of B1 Ia+ stars are found to be near 17,000 K, those of O4 stars near 45,000, and those of WN7/WN8 stars near 26,000 K. The question of modeling the atmospheres of hot luminous stars is examined, and it is noted that the photosphere can be modeled adequately using a classical plane-parallel layer model atmosphere. In addition, it is found that the Wolf-Rayet stars of types WN7/WN8 fall in the H-R diagram near the B0 Ia stars, while the others fall near B0.5 III stars. The evolutionary relationship between the Wolf-Rayet and O stars is considered; it is suggested that a Wolf-Rayet spectrum is a short-lived phase in the life of a massive star.
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