Journal
ASTRONOMY & ASTROPHYSICS
Volume 420, Issue 2, Pages L9-L13Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20040150
Keywords
binaries : spectroscopic; stars : early-type; stars : fundamental parameters; stars : individual : WR 20a
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We analyse spectroscopic observations of WR20a revealing that this star is a massive early-type binary system with a most probable orbital period of similar to3.675 days. Our spectra indicate that both components are most likely of WN6ha or 031f*/WN6ha spectral type. The orbital solution for a period of 3.675 days yields extremely large minimum masses of 70.7 +/- 4.0 and 68.8 +/- 3.8 M. for the two stars. These properties make WR 20a a cornerstone system for the study of massive star evolution.
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