Spectroscopy of the archetype colliding-wind binary WR 140 during the 2009 January periastron passage

[en] We present the results from the spectroscopic monitoring of WR 140 (WC7pd + O5.5fc) during its latest periastron passage in 2009 January. The observational campaign consisted of a constructive collaboration between amateur and professional astronomers. It took place at six locations, including Teide Observatory, Observatoire de Haute Provence, Dominion Astrophysical Observatory and Observatoire du Mont Mégantic. WR 140 is known as the archetype of colliding-wind binaries and it has a relatively long period (?8 yr) and high eccentricity (?0.9). We provide updated values for the orbital parameters, new estimates for the WR and O star masses and new constraints on the mass-loss rates and colliding-wind geometry.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Fahed, R.; Département de physique, Université de Montréal, CP 6128, Succ. C.-V., Montréal, QC H3C 3J7, and Centre de Recherche en Astrophysique du Québec, Canada

Moffat, A. F. J.; Département de physique, Université de Montréal, CP 6128, Succ. C.-V., Montréal, QC H3C 3J7, and Centre de Recherche en Astrophysique du Québec, Canada

Zorec, J.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre et Marie Curie, 98bis bd. Arago F-75014 Paris, France

Eversberg, T.; Schnörringen Telescope Science Institute, Waldbröl, Germany

Chené, A. N.; Canadian Gemini Office, HIA/NRC of Canada, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada ; Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Av. Esteban Iturra s/n Barrio Universitario, Universidad de Concepción, Casilla 160-C, Concepción, Chile ; Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile

Alves, F.; CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA ; Universities Space Research Association, 10211 Wisconsin Circle, Suite 500, Columbia, MD 21044, USA

Arnold, W.; National Research Council, Herzberg Institute of Astrophysics, Dominion Radio Astrophysical Observatory, PO Box 248, Penticton, BC V2A 6J9, Canada

Bergmann, T.; Royal Observatory of Belgium, 3 Av. circulaire, B-1180 Bruxelles, Belgium

Corcoran, M. F.; Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain

Correia Viegas, N. G.; Three Hills Observatory, The Birches, CA7 1JF

More authors (24 more)

Language :

English

Title :

Spectroscopy of the archetype colliding-wind binary WR 140 during the 2009 January periastron passage

Publication date :

01 November 2011

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Blackwell Publishing, Oxford, United Kingdom

Volume :

418

Pages :

2-13

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2011MNRAS.418....2F

Available on ORBi :

since 12 December 2011

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