Crowther, P.A.

De Becker, M.

Gosset, E.

Nazé, Y.

Rauw, G.

Sana, H.

van der Hucht, K.A.

Vreux, J.-M.

Williams, P.M.

English

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

International Migration, Integration and Social Cohesion online publications

WR 20a: A massive cornerstone binary system comprising two extreme early-type stars

https://pure.uva.nl/ws/files/4044067/37198_162224y.pdf

WR 20a: A massive cornerstone binary system comprising two extreme early-type stars

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International Migration, Integration and Social Cohesion online publications