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Title:
Radio emission from galactic Wolf-Rayet stars and the structure of Wolf-Rayet winds
Authors:
Abbott, D. C.; Beiging, J. H.; Churchwell, E.; Torres, A. V.
Affiliation:
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(Joint Institute for Laboratory Astrophysics, Boulder, CO), AC(California, University, Berkeley), AD(Washburn Observatory, Madison, WI)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 239-261. (ApJ Homepage)
Publication Date:
04/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
MILKY WAY GALAXY, RADIO EMISSION, STELLAR SPECTROPHOTOMETRY, STELLAR STRUCTURE, STELLAR WINDS, WOLF-RAYET STARS, CENTIMETER WAVES, MASS TO LIGHT RATIOS, NONTHERMAL RADIATION, O STARS, SPECTRUM ANALYSIS, STELLAR EVOLUTION, STELLAR MASS EJECTION, VISIBLE SPECTRUM
DOI:
10.1086/164070
Bibliographic Code:
1986ApJ...303..239A

Abstract

The authors have observed 23 Wolf-Rayet stars with the VLA at 6 cm and reobserved four stars at both 2 and 6 cm. When combined with previous data, these observations form an essentially complete sample of 40 W-R stars within a distance of 3 kpc and north of declination -47°. Available measurements of optical emission lines are used to estimate the volume emission measure, ionization balance, and terminal velocity V of the stellar wind for the sample stars. In the sample 33 stars (77%) are probable or definite thermal wind sources and five stars (12%) are probable or definite nonthermal sources. Stellar mass loss rates for the thermal sources lie in the narrow range 0.8×10-5 ⪅ M⪅ 8.0×10-5M_sun;yr-1, with a mean value of 2×10-5M_sun;yr-1. It is speculated that the narrow range in observed Mis caused by a narrow range in intrinsic mass for the sample stars.

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