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- W2119556841 abstract "The stellar properties of Sk 41 (AB4, WN5h), the only known single Wolf-Rayet star in the SMC, are derived from ultraviolet (IUE), optical (AAT) and near-IR (NTT) spec- troscopy. Contrary to expectations for low metal environ- ments, the stellar properties of Sk 41 are typical of equiv- alent WN stars in the Galaxy and LMC, with T42kK, log(L=L)=5.7, v1=1300 km s 1 , H/He2 by number, and _ M= p f =310 5 Myr 1 , where f is the volume filling factor. The stellar luminosity of Sk 41 is 50% below the minimum value predicted by single star evolutionary models at the metallicity of the SMC, suggesting a deficiency in present evolutionary models at low metallicity. Emission line luminosities of Heii4686 and Civ 5801- 12 in SMC WR stars are not systematically lower than their Galactic and LMC counterparts. From 43 late-type and 59 early- type WN stars, log L HeII = 36.0 erg s 1 and 35.8 erg s 1 , re- spectively, while log L CIV =36.5 erg s 1 . from 25 early-type WC stars. This new calibration has application in deriving WR populations in young starburst galaxies. Synthetic WN models are calculated with identical param- eters except that metal abundances are varied. Following the Smith et al. WN classification scheme, CNO equilibrium models reveal that earlier spectral types are predicted at lower metallic- ity, i.e. WN3-4 at 0.04Z versus WN6 at 1.0Z. This provides an explanation for the trend towards earlier WN spectral types at low metallicity." @default.
- W2119556841 created "2016-06-24" @default.
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- W2119556841 date "2000-04-01" @default.
- W2119556841 modified "2023-09-26" @default.
- W2119556841 title "Wind properties of Wolf-Rayet stars at low metallicity: Sk 41 (SMC)" @default.
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