The spectra of extragalactic Wolf-Rayet stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Intergalactic Media, Local Group (Astronomy), Star Distribution, Stellar Evolution, Stellar Spectra, Wolf-Rayet Stars, Data Reduction, Molecular Clouds, Spectral Line Width, Spectrum Analysis, Stellar Spectrophotometry

Scientific paper

Spectra of 93 WR stars in M31, M33, NGC 6822, and IC 1613, obtained with the IIDS and Cryogenic Camera on the KPNO 4-m telescope and with the photon-counting Reticon system on the MMT, are examined in order to study the massive-star content of these galaxies and the properties of their most massive stars. The M33 WN and WC stars are shown to follow the same linewidth/line-strength relation as do the Galactic and LMC stars, while the WR stars in NGC 6822 resemble the SMC stars. It is also noted that the M31 WR stars are relatively weak lined for their linewidths.

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