Another single hydrogen-rich Wolf-Rayet star in the SMC?
C. Foellmi
TL;DR
This paper reports the spectral analysis of the 12th Wolf-Rayet star in the SMC, revealing it as a faint, hydrogen-rich WN star, and discusses its evolutionary implications based on spectroscopic data.
Contribution
It provides the first detailed spectral analysis of SMC-WR12 and discusses its evolutionary status as a low-mass, rotating progenitor star.
Findings
SMC-WR12 is a faint, hydrogen-rich WN star.
Spectroscopic data suggest a single star status.
Low-mass rotating progenitors explain its properties.
Abstract
A 12th Wolf-Rayet star in the SMC has recently been discovered by Massey et al. (2003). In order to determine its spectral type and a preliminary binary status, we obtained 3 high signal-to-noise spectra separated in time at the ESO-NTT. Compared to other WR stars in the SMC, SMC-WR12 appears to belong to the subgroup of faint, single and hydrogen-rich WN stars. We discuss the evolutionary status of WR12 and show that relatively low mass rotating progenitors can better account for the properties of single hydrogen-rich WN stars in the SMC.
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