Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.418....2f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 418, Issue 1, pp. 2-13.
Astronomy and Astrophysics
Astronomy
Binaries: General, Stars: Fundamental Parameters, Stars: Winds, Outflows, Stars: Wolf-Rayet
Scientific paper
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.
Alves Filipe
Arnold Walter
Bergmann Timo
Chené André-Nicolas
Corcoran Michael F.
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