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We study relatively isolated massive WN-type stars in the Galactic center.The K-band spectra of WR102ka and WR102c are exploited to infer the stellarparameters and to compute synthetic stellar spectra using the PotsdamWolf-Rayet (PoWR) model atmosphere code. These models are combined withdust-shell models for analyzing the Spitzer IRS spectra of these objects.Archival IR images complement the interpretation. We report that WR102ka andWR102c are among the most luminous stars in the Milky Way. The mid-IR continuafor both objects are dominated by dust emission. For the first time we reportthe presence of dust in the close vicinity of WN stars. Also for the firsttime, we have detected lines of pure-rotational transitions of molecularhydrogen in a massive-star nebula. A peony-shaped nebula around 102ka isresolved by the Spitzer MIPS camera. We attribute the formation of this nebulato the recent evolutionary history of WR102ka.

Two extremely luminous WN stars in the Galactic center with circumstellar emission from dust and gas