Isolating clusters with wolf-rayet stars in I zw 18
Oct, 20024 pages
Published in:
- Astrophys.J.Lett. 579 (2002) L75-L78,
- Astrophys.J.Lett. 581 (2002) L129 (erratum)
e-Print:
- astro-ph/0210089 [astro-ph]
DOI:
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Abstract: (arXiv)
We present UV images and spectra of the starburst galaxy I Zw 18, taken with the Space Telescope Imaging Spectrograph. The high spatial resolution of these data allows us to isolate clusters containing Wolf-Rayet stars of the subtype WC. Our far-UV spectra clearly show CIV 1548,1551 and HeII 1640 emission of WC stars in two clusters: one within the bright (NW) half of I Zw 18, and one on the outskirts of this region. The latter spectrum is unusual, because the CIV is seen only in emission, indicating a spectrum dominated by WC stars. These data also demonstrate that the HI column in I Zw 18 is strongly peaked in the fainter (SE) half of I Zw 18, with a column depth far larger than that reported in previous analyses.References(0)
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