Discovery and Quantitative Spectral Analysis of an O[CLC]fpe[/CLC]/WN9 (WN11) Star in the Sculptor Spiral Galaxy NGC 300

Fabio Bresolin, Rolf-Peter Kudritzki, Francisco Najarro, Wolfgang Gieren, Grzegorz Pietrzyński
2002 Astrophysical Journal  
We have discovered an Ofpe/WN9 (WN11 following Smith et al.) star in the Sculptor spiral galaxy NGC 300, the first object of this class found outside the Local Group, during a recent spectroscopic survey of blue supergiant stars obtained at the ESO VLT. The light curve over a five-month period in late 1999 displays a variability at the 0.1 mag level. The intermediate resolution spectra (3800-7200 A) show a very close resemblance to the Galactic LBV AG Car during minimum. We have performed a
more » ... iled non-LTE analysis of the stellar spectrum, and have derived a chemical abundance pattern which includes H, He, C, N, O, Al, Si and Fe, in addition to the stellar and wind parameters. The derived stellar properties and the He and N surface enrichments are consistent with those of other Local Group WN11 stars in the literature, suggesting a similar quiescent or post-LBV evolutionary status.
doi:10.1086/344241 fatcat:wuk7nd3yefgwnidvvyaags7zk4