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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Bibliography

Carraro, G., & Munari, U. 2004, MNRAS, 347, 625
Crowther, P. A., & Dessart, L. 1998, MNRAS, 296, 622
Driesens, L. 2003, Master thesis, University of Liège
Eggleton, P. P. 1983, ApJ, 268, 368
Gosset, E., Royer, P., Rauw, G., Manfroid, J., & Vreux, J.-M. 2001, MNRAS, 327, 435
Heck, A., Manfroid, J., & Mersch, G. 1985, A&AS, 59, 63
Massey, P., Penny, L. R., & Vukovich, J. 2002, ApJ, 565, 982
Moffat, A. F. J., Shara, M. M., & Potter, M. 1991, AJ, 102, 642
Moffat, A. F. J., Drissen, L., & Shara, M. M. 1994, ApJ, 436, 183
Piatti, A. E., Bica, E., & Clariá, J. J. 1998, A&AS, 127, 423
Rauw, G., Vreux, J.-M., Gosset, E., et al. 1996, A&A, 306, 771
Sana, H., Hensberge, H., Rauw, G., & Gosset, E. 2003, A&A, 405, 1063
Schweickhardt, J., Schmutz, W., Stahl, O., Szeifert, T., & Wolf, B. 1999, A&A, 347, 127
Shara, M. M., Moffat, A. F. J., Smith, L. F., & Potter, M. 1991, AJ, 102, 716
Shara, M. M., Moffat, A. F. J., Smith, L. F., et al. 1999, AJ, 118, 390
Shulman, S., Bortolot, V. J., & Thaddeus, P. 1974, ApJ, 193, 97
Thé, P. S. 1966, Contributions Bosscha Observatory, 35, 1
Vanbeveren, D., de Loore, C., & van Rensbergen, W. 1998, A&ARv, 9, 63
van der Hucht, K. A. 2001, New Astron. Rev., 45, 135
Walborn, N. R. 2001, in Eta Carinae and Other Mysterious Stars, ed. T. Gull, S. Johansson, & K. Davidson, ASP Conf. Ser., 242, 217
Walborn, N. R., & Hesser, J. E. 1975, ApJ, 199, 535
Walborn, N. R., Howarth, I. D., Lennon, D. J., et al. 2002, AJ, 123, 2754