M. De Becker
K.A. van der Hucht
- WR 20a: A massive cornerstone binary system comprising two extreme early-type stars
- Astronomy & Astrophysics
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
We analyse spectroscopic observations of WR 20a revealing that this star is a massive early-type binary system with a most probable orbital period of ~3.675 days. Our spectra indicate that both components are most likely of WN6ha or O3If*/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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