期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 460, 期 2, 页码 1555-1566出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1118
关键词
stars: Wolf-Rayet; galaxies: individual: M81; galaxies: star clusters: general
资金
- CONACyT (Mexico) [CB-2010-01-155142-G3, CB-2011-01-167281-F3]
- CONACyT
We here report the properties of Wolf-Rayet (W-R) stars in 14 locations in the nearby spiral galaxy M81. These locations were found serendipitously while analysing the slit spectra of a sample of similar to 150 star-forming complexes, taken using the long-slit and multiobject spectroscopic modes of the OSIRIS instrument at the 10.4-m Gran Telescopio Canarias. Colours and magnitudes of the identified point sources in the Hubble Space Telescope images compare well with those of individual W-R stars in the Milky Way. Using templates of individual W-R stars, we infer that the objects responsible for the observed W-R features are single stars in 12 locations, comprising of three WNLs, three WNEs, two WCEs and four transitional WN/C types. In diagrams involving bump luminosities and the width of the bumps, the W-R stars of the same sub-class group together, with the transitional stars occupying locations intermediate between the WNE and WCE groups, as expected from the evolutionary models. However, the observed number of 4 transitional stars out of our sample of 14 is statistically high as compared to the 4 per cent expected in stellar evolutionary models.
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