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Astron. Astrophys. 326, 976-981 (1997)

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Wolf-Rayet stars detected in five associations of NGC 300 *

J. Breysacher 1, M. Azzopardi 2, G. Testor 3 and G. Muratorio 2

1 European Southern Observatory, D-85748 Garching bei München, Germany
2 Observatoire de Marseille, 2 Place Le Verrier, F-13248 Marseille Cedex 04, France
3 Observatoire de Paris, Section de Meudon, DAEC, F-92195 Meudon Cedex, France

Received 29 April 1997 / Accepted 11 July 1997

Abstract

A search for WR stars in five associations of the Sc galaxy NGC 300 has permitted to better locate, in crowded regions, some of the already known objects and to discover six new WR stars. The on-line/off-line imaging technique was applied using the SUperb Seeing Imager (SUSI) of the ESO New Technology Telescope (NTT) installed at La Silla, Chile. Of the twelve WR stars identified up to now in these associations, three remain to be definitely confirmed by slit spectroscopy, however they have detection significances [FORMULA] and can therefore be considered bona fide WR stars. It is argued that after the present survey most, possibly all, of the WR stars contained in the associations studied have been discovered. The average "O/WR" ratio of [FORMULA] obtained from the comparison of the numbers of WR and zero-age-main-sequence O5 stars is well in the range of the values found for other galaxies, in particular M 33 generally considered as a twin of NGC 300.

Key words: galaxies: NGC 300; M 33; star clusters; stellar content stars: evolution – stars: Wolf-Rayet.

* Based on observations collected at the European Southern Observatory, La Silla, Chile (observing proposal ESO No. 56.D-0361)

Send offprint requests to: J. Breysacher

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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