Data on an unusual Wolf-Rayet star in the nearby Galaxy IC 1613
Abstract
Observations of an H II region in IC 1613 which is excited by a hot Wolf-Rayet star are reported, and the nebular and stellar spectra are discussed. The nebular helium abundance is not far above the primordial value, while oxygen and argon are less abundant than in the sun or the Orion nebula by factors of about ten. The observed H-beta flux, corrected for interstellar extinction, corresponds to an H-beta luminosity of about 1.35 x 10 to the 36th ergs/s. The spectrum of the star shows broad C IV features reported by previous authors, and somewhat less broad O VI features. The nebular recombination lines can be used to make Zanstra-style estimates of the star's ionizing continuum. Most of this luminosity is probably at wavelengths similar to the peak of a 110,000 K blackbody spectrum. The Wolf-Rayet star is likely to have had a metal-poor initial composition.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- August 1982
- DOI:
- Bibcode:
- 1982PASP...94..634D
- Keywords:
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- Abundance;
- Dwarf Galaxies;
- Hot Stars;
- Nebulae;
- Stellar Spectrophotometry;
- Wolf-Rayet Stars;
- Carbon;
- Data Acquisition;
- Emission Spectra;
- H Ii Regions;
- Line Spectra;
- Oxygen;
- Spectral Line Width;
- Stellar Luminosity;
- Stellar Spectra;
- Astrophysics