VLT Spectroscopy of Blue Supergiants in IC 1613

We present multiobject spectroscopy of young, massive stars in the Local Group galaxy IC 1613. We provide the spectral classification and a detailed spectral catalog for 54 OBA stars in this galaxy. The majority of the photometrically selected sample is composed of B- and A-type supergiants. The rem...

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Veröffentlicht in:The Astrophysical journal 2007-12, Vol.671 (2), p.2028-2039
Hauptverfasser: Bresolin, Fabio, Urbaneja, Miguel A, Gieren, Wolfgang, Pietrzyński, Grzegorz, Kudritzki, Rolf-Peter
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Sprache:eng
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Zusammenfassung:We present multiobject spectroscopy of young, massive stars in the Local Group galaxy IC 1613. We provide the spectral classification and a detailed spectral catalog for 54 OBA stars in this galaxy. The majority of the photometrically selected sample is composed of B- and A-type supergiants. The remaining stars include early O-type dwarfs and the only Wolf-Rayet star known in this galaxy. Among the early B stars we have serendipitously uncovered six Be stars, the largest spectroscopically confirmed sample of this class of objects beyond the Magellanic Clouds. We measure chemical abundances for nine early B supergiants, and find a mean oxygen abundance of 12 + log (O/H) = 7.90 plus or minus 0.08. This value is consistent with the result we obtain for two H II regions in which we detect the temperature-sensitive [O III] lambda 4363 auroral line.
ISSN:0004-637X
1538-4357
DOI:10.1086/522571