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

Rauw, Grégor; De Becker, Michaël; Nazé, Yaël; Crowther, P. A.; Gosset, Eric; Sana, H.; van der Hucht, K. A.; Vreux, Jean-Marie; Williams, P. M.

doi:10.1051/0004-6361:20040150

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

Rauw, Grégor; De Becker, Michaël; Nazé, Yaël et al.

2004 • In Astronomy and Astrophysics, 420 (2), p. 9-L13

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https://hdl.handle.net/2268/3631

DOI
10.1051/0004-6361:20040150

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Keywords :

binaries : spectroscopic; stars : early-type; stars : fundamental parameters; stars : individual : WR 20a

Abstract :

[en] 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.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)

De Becker, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)

Nazé, Yaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)

Crowther, P. A.

Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)

Sana, H.

van der Hucht, K. A.

Vreux, Jean-Marie ; Université de Liège - ULiège > Département d'astrophysique

Williams, P. M.

Language :

English

Title :

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

Publication date :

June 2004

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

E D P Sciences, Les Ulis Cedexa, France

Volume :

420

Issue :

Pages :

L9-L13

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://arxiv.org/abs/astro-ph/0404551

Available on ORBi :

since 06 January 2009

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