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The radii of the Wolf-Rayet stars and the extent of their chromosphere-corona formation

Abstract

The radii of 14 Wolf-Rayet stars are computed on the basis of previously reported absolute fluxes in the region from 4150 to 8000 A for 10 WN stars and from 3650 to 8000 A for four WC stars. For comparison, the radii of 11 Of stars are also calculated. The Wolf-Rayet radii are found to range from about 10 to 35 solar radii, values that do not appear to provide supporting evidence for the hypothesis that Of stars evolve into late WN stars. Available UV observations of Gamma-2 Vel are used to investigate the extent of the chromosphere-corona structure in Wolf-Rayet stars. It is suggested that the second electron-temperature maximum in a recently proposed model for the extended envelopes of Wolf-Rayet stars should be further than about 300 solar radii from the center of a star.
Authors:
Sahade, J; [1]  Zorec, J [2] 
  1. Instituto de Astronomia y Fisica del Espacio, Buenos Aires, Argentina
  2. College de France, Paris, France
Publication Date:
Mar 01, 1981
Product Type:
Conference
Reference Number:
EDB-82-033290
Resource Relation:
Journal Name: Soc. Astron. Ital., Mem.; (Italy); Journal Volume: 52; Conference: Consiglio Nazionale delle Ricerche meeting, Rome, Italy, 30 May 1980
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; WOLF-RAYET STARS; SIZE; STELLAR ATMOSPHERES; CHROMOSPHERE; STAR EVOLUTION; STAR MODELS; STARS; ULTRAVIOLET RADIATION; ATMOSPHERES; ELECTROMAGNETIC RADIATION; MAIN SEQUENCE STARS; MATHEMATICAL MODELS; RADIATIONS; SOLAR ATMOSPHERE; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
OSTI ID:
5801712
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MSATA
Submitting Site:
IAA
Size:
Pages: 23-35
Announcement Date:

Citation Formats

Sahade, J, and Zorec, J. The radii of the Wolf-Rayet stars and the extent of their chromosphere-corona formation. Italy: N. p., 1981. Web.
Sahade, J, & Zorec, J. The radii of the Wolf-Rayet stars and the extent of their chromosphere-corona formation. Italy.
Sahade, J, and Zorec, J. 1981. "The radii of the Wolf-Rayet stars and the extent of their chromosphere-corona formation." Italy.
@misc{etde_5801712,
title = {The radii of the Wolf-Rayet stars and the extent of their chromosphere-corona formation}
author = {Sahade, J, and Zorec, J}
abstractNote = {The radii of 14 Wolf-Rayet stars are computed on the basis of previously reported absolute fluxes in the region from 4150 to 8000 A for 10 WN stars and from 3650 to 8000 A for four WC stars. For comparison, the radii of 11 Of stars are also calculated. The Wolf-Rayet radii are found to range from about 10 to 35 solar radii, values that do not appear to provide supporting evidence for the hypothesis that Of stars evolve into late WN stars. Available UV observations of Gamma-2 Vel are used to investigate the extent of the chromosphere-corona structure in Wolf-Rayet stars. It is suggested that the second electron-temperature maximum in a recently proposed model for the extended envelopes of Wolf-Rayet stars should be further than about 300 solar radii from the center of a star.}
journal = {Soc. Astron. Ital., Mem.; (Italy)}
volume = {52}
place = {Italy}
year = {1981}
month = {Mar}
}