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Hydrogen in the atmosphere of the evolved WN3 Wolf-Rayet star WR 3: defying an evolutionary paradigm?

Marchenko, S. V.; Moffat, A. F. J.; Crowther, P. A. et al.

2004 • In Monthly Notices of the Royal Astronomical Society, 353 (1), p. 153-161

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https://hdl.handle.net/2268/4883

DOI
10.1111/j.1365-2966.2004.08058.x

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Keywords :

stars : abundances; stars : individual : WR 3; stars : Wolf-Rayet

Abstract :

[en] WR 3 is the brightest very early-type WN star in the sky. Based on several years of time-resolved spectroscopy and precision photometry on various time-scales, we deduce that WR 3 is most likely a single, weak-lined star of type WN3ha (contrary to its current catalogue-type of WN3 + O4), with H lines occurring both in emission and absorption in its wind. This conclusion is confirmed and strengthened via detailed modelling of the spectrum of WR 3. Given the similarity of WR 3 with numerous H-rich WNE stars in the Large Magellanic Cloud and especially the Small Magellanic Cloud, and its location towards the metal-deficient exterior of the Galaxy, we conclude that rotationally induced meridional circulation probably led to the apparently unusual formation of this hot Galactic WN star with enhanced hydrogen. Although we cannot completely rule out the possibility of a binary with a low orbital inclination and/or long period, we regard this latter possibility as highly unlikely.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Marchenko, S. V.

Moffat, A. F. J.

Crowther, P. A.

Chene, A. N.

De Serres, M.

Eenens, P. R. J.

Hill, G. M.

Moran, J.

Morel, Thierry ; Osservatorio Astronomico di Palermo G. S. Vaiana, Istituto Nazionale di Astrofisica

Language :

English

Title :

Hydrogen in the atmosphere of the evolved WN3 Wolf-Rayet star WR 3: defying an evolutionary paradigm?

Publication date :

01 September 2004

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Blackwell Publishing Ltd, Oxford, United Kingdom

Volume :

353

Issue :

1

Pages :

153-161

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 19 February 2010

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