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Molecular gas associated with Wolf-Rayet ring nebulae

Published online by Cambridge University Press:  25 May 2016

Anthony P. Marston ,
Jaydene T. Welzmiller ,
Mark A. Bransford ,
John H. Black  and
P. Bergman
Anthony P. Marston
Affiliation:
Physics & Astronomy Department, Drake University, Des Moines, IA 50311, USA
Jaydene T. Welzmiller
Affiliation:
Physics & Astronomy Department, Drake University, Des Moines, IA 50311, USA
Mark A. Bransford
Affiliation:
Astronomy Department, New Mexico State University, Las Cruces, NM 88003, USA
John H. Black
Affiliation:
Onsala Space Observatory, Chalmers University of Technology, S-439 92 Onsala, Sweden
P. Bergman
Affiliation:
Onsala Space Observatory, Chalmers University of Technology, S-439 92 Onsala, Sweden

Abstract

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We present the first 12CO 1→0 emission-line maps of the vicinities of two Wolf-Rayet stars (WR 16 and WR 75) and their associated ring nebulae. We illustrate that sizeable amounts of molecular gas appear associated with these ring nebulae and therefore that the mass of gas in ring nebulae is significantly higher than inferred from observations of the ionized gas component alone. We discuss the possible stellar and interstellar origins of these molecular materials and the implications for the evolution of massive stars up to the WR phase.

Type
Part 3. Interaction of Wolf-Rayet stars and other hot massive stars with their environment: colliding winds and ring nebulae
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 370 - 371
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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