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Comments on the Significance of the Positions of Population I Wolf-Rayet Stars in the HR Diagram

Published online by Cambridge University Press:  14 August 2015

Anne B. Underhill
Anne B. Underhill*
Affiliation:
Laboratory for Astronomy and Solar Physics Goddard Space Flight Center, Greenbelt, MD 20771

Abstract

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The size of typical errors in log L/L⊙ and log Teff is investigated for WR stars, and it is found that typically Δ log L/L⊙ = ±(0.25 ± 0.03), and Δ log Teff = ±(0.05 ± 0.02). The major sources of error are the uncertainties in the distance modulus of the star and the integrated continuous flux from about 1400 å to 1 µm or so. The same is true for O and early B stars. With uncertainties of these sizes in log L/L⊙ and log Teff, it is unreliable to estimate the mass of an early-type star from its observed position in the HR diagram. The WN7/8 stars lie with the O9/B0 Ia stars, the other WR stars with the B0/B1 III stars.

Type
SESSION 8 — X-RAY DATA — MISCELLANEOUS TOPICS — GENERAL DISCUSSION
Information
Symposium - International Astronomical Union , Volume 99: Wolf-Rayet Stars: Observations, Physics, Evolution , 1982 , pp. 571 - 575
Copyright
Copyright © Reidel 1982 

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