VLT Spectroscopy of Blue Supergiants in IC 1613

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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Astronomy
Earth, ocean, space
Exact sciences and technology
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container_issue 2
container_start_page 2028
container_title The Astrophysical journal
container_volume 671
creator Bresolin, Fabio
Urbaneja, Miguel A
Gieren, Wolfgang
Pietrzyński, Grzegorz
Kudritzki, Rolf-Peter
description 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.
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Exact sciences and technology
title VLT Spectroscopy of Blue Supergiants in IC 1613
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