Most High-Mass Stars are Born as Twins

Details Most High-Mass Stars are Born as Twins Most High-Mass Stars are Born as Twins

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..447...67c&link_type=abstract

Evolution of compact binaries. Proceedings of a workshop held at Hotel San Martín, Viña del Mar, Chile 6–11 May 2011. ASP Confe

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on an ongoing survey concerning the multiplicity of southern O-type stars. The project is performed at the Universitätssternwarte Bochum, a new facility close to Cerro Armazones, and uses multi-epoch high-resolution spectra and photometric monitoring. The stellar sample, the observations and preliminary results are described. It is found that most O-type stars ( > 80%) are spectroscopic binaries, many of them even double-lined systems (˜ 60%) with similar-mass components. These findings are relevant for the physical properties of the most massive stars and will require a revision of fundamental O-star parameters like mass and absolute brightness.

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