EDP Sciences
Free access
Volume 369, Number 2, April II 2001
Page(s) 544 - 551
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010122

A&A 369, 544-551 (2001)
DOI: 10.1051/0004-6361:20010122

The nature of Sk -67°18 in the Large Magellanic Cloud: A multiple system with an O3f$^\star$ component

V. S. Niemela1, W. Seggewiss2 and A. F. J. Moffat3

1  Observatorio Astronómico, Paseo del Bosque, 1900 La Plata, Argentina
2  Observatorium Hoher List der Universitätssternwarte Bonn, 54550 Daun, Germany
3  Département de Physique, Université de Montréal, and Observatoire du Mont Mégantic, CP 6128, Succ. Centre-Ville, Montréal, Canada

(Received 4 October 2000 / Accepted 19 January 2001 )

We present the results of photometric and spectroscopic observations obtained between 1980 and 1996, which show that the bright star Sk -67°18 in the Large Magellanic Cloud (LMC) is a multiple star which contains an eclipsing binary system. Our spectra show that this is an Of + O type binary, where the primary is probably of type O3f*. The orbital period of the eclipsing binary is almost exactly 2 days, which considerably compromises the obtaining of data with suitable phase coverage. Furthermore, from our radial velocity analysis of the spectral lines, Sk -67°18 appears to be a multiple system consisting of at least two pairs of short-period binaries.

Key words: galaxies: individual: LMC -- stars: binaries: general -- stars: early-type -- stars: individual: Sk -67°18

Offprint request: W. Seggewiss, seggewis@astro.uni-bonn.de

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