Marchenko 2010 PopI WR星的星风

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Title:		Population I Wolf-Rayet Runaway Stars: The Case of WR124 and its Expanding Nebula M1-67
Authors:		Marchenko, S. V.; Moffat, A. F. J.; Crowther, P. A.
Affiliation:		AA(Science Systems and Applications, Inc., 10210 Greenbelt Road, Suite 600, Lanham, MD 20706, USA sergey.marchenko@ssaihq.com), AB(Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada moffat@astro.umontreal.ca), AC(Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Rd, Sheffield, S3 7RH, UK Paul.Crowther@sheffield.ac.uk)
Publication:		The Astrophysical Journal Letters, Volume 724, Issue 1, pp. L90-L94 (2010). (ApJL Homepage)
Publication Date:		11/2010
Origin:		IOP
ApJ Keywords:		gamma-ray burst: general, stars: distances, stars: individual: WR 124, stars: Wolf-Rayet, supernovae: general
DOI:		10.1088/2041-8205/724/1/L90
Bibliographic Code:		2010ApJ...724L..90M

Abstract

In 1997 and 2008 we used the WFPC2 camera on board the Hubble Space Telescope to obtain two sets of narrow-band Hα images of the runaway Wolf-Rayet (WR) star WR 124 surrounded by its nebula M1-67. This two-epoch imaging provides an expansion parallax and thus a practically assumption-free geometric distance to the nebula, d = 3.35 ± 0.67 kpc. Combined with the global velocity distribution in the ejected nebula, this confirms the extreme runaway status of WR 124. WR stars embedded within such ejection nebulae at the point of core collapse would produce different supernova characteristics from those expected for stars surrounded by wind-filled cavities. In galaxies with extremely low ambient metallicity, Z <= 10^–3 Z _sun, γ-ray bursts originating from fast-moving runaway WR stars may produce afterglows which appear to be coming from regions with a relatively homogeneous circumburst medium.

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