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- W1958408535 abstract "An updated classification scheme for transition O2-3.5If*/WN5-7 stars is presented, following recent revisions to the spectral classifications for O and WN stars. We propose that O2-3.5If*, O2-3.5If*/WN5-7 and WN5-7 stars may be discriminated using the morphology of Hbeta to trace increasing wind density as follows: purely in absorption for O2-3.5If* stars in addition to the usual diagnostics from Walborn et al.; P Cygni for O2-3.5If*/WN5-7 stars; purely in emission for WN stars in addition to the usual diagnostics from Smith et al. We also discuss approximate criteria to discriminate between these subtypes from near-IR spectroscopy. The physical and wind properties of such stars are qualitatively discussed together with their evolutionary significance. We suggest that the majority of O2-3.5If*/WN5-7 stars are young, very massive hydrogen-burning stars, genuinely intermediate between O2-3.5If* and WN5-7 subtypes, although a minority are apparently core helium-burning stars evolving blueward towards the classical WN sequence. Finally, we reassess classifications for stars exhibiting lower ionization spectral features plus Hbeta emission." @default.
- W1958408535 created "2016-06-24" @default.
- W1958408535 creator A5010395935 @default.
- W1958408535 creator A5068280975 @default.
- W1958408535 date "2011-07-25" @default.
- W1958408535 modified "2023-09-25" @default.
- W1958408535 title "Spectral classification of O2-3.5 If*/WN5-7 stars" @default.
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- W1958408535 doi "https://doi.org/10.1111/j.1365-2966.2011.19129.x" @default.
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