Hot, Massive Stars in I Zw 18

Details Hot, Massive Stars in I Zw 18 Hot, Massive Stars in I Zw 18

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743417h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.17; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

I Zw 18 is one of the most primitive blue, compact dwarf galaxies. The ionized gas in I Zw 18 has a low oxygen abundance (O 1/30 Osun) and nitrogen abundance (N 1/100 Nsun) (Pequignot 2008). We have obtained a far-UV spectrum of the northwest massive star cluster of I Zw 18 using Hubble's Cosmic Origins Spectrograph (COS). The spectrum is compatible with continuous star-formation over the past 10 Myr, and a very low metallicity, log Z/Zsun -1.7, although the stellar surface may be enhanced in carbon. Stellar wind lines are very weak, and the edge velocity of wind lines is very low ( 250 km/s).

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