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Sara R. Heap, Ivan Hubeny, Thierry Lanz, Wayne Landsman, Don Lindler & Eliot Malumuth

Hot, Massive Stars in I Zw 18

(Volume 80 - Année 2011)
Article
Open Access

Abstract

We present the far-ultraviolet spectrum of the northwest component of I Zw 18, a blue compact galaxy having a very low metallicity. The spectrum is compatible with continuous star-formation over the past ~ 15 Myr (CSF age), and a very low metallicity, log Z/Zo ~ -1.7, although the stellar surface may be enhanced in carbon. Stellar winds are very weak, and the edge velocity of wind lines is very low (~ 250 km/s).

Pour citer cet article

Sara R. Heap, Ivan Hubeny, Thierry Lanz, Wayne Landsman, Don Lindler & Eliot Malumuth, «Hot, Massive Stars in I Zw 18», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 149 - 154 URL : http://popups.ulg.be/0037-9565/index.php?id=2608.

A propos de : Sara R. Heap

NASA’s Goddard Space Flight Center, Mail Code 667, Greenbelt MD, USA

A propos de : Ivan Hubeny

University of Arizona, Tucson AZ, USA

A propos de : Thierry Lanz

University of Maryland, College Park MD, USA

A propos de : Wayne Landsman

NASA’s Goddard Space Flight Center, Mail Code 667, Greenbelt MD, USA, and Adnet Systems, Inc., Rockville MD, USA

A propos de : Don Lindler

NASA’s Goddard Space Flight Center, Mail Code 667, Greenbelt MD, USA, and Sigma Space, Inc., Lanham MD, USA

A propos de : Eliot Malumuth

NASA’s Goddard Space Flight Center, Mail Code 667, Greenbelt MD, USA, and Wyle Information Systems, McLean VA, USA