SIMBAD references

2010MNRAS.403..760G - Mon. Not. R. Astron. Soc., 403, 760-767 (2010/April-1)

A new Wolf-Rayet star and its circumstellar nebula in Aquila.


Abstract (from CDS):

We report the discovery of a new Wolf-Rayet star in Aquila via detection of its circumstellar nebula (reminiscent of ring nebulae associated with late WN stars) using the Spitzer Space Telescope archival data. Our spectroscopic follow-up of the central point source associated with the nebula showed that it is a WN7h star (we named it WR121b). We analysed the spectrum of WR121b by using the Potsdam Wolf-Rayet model atmospheres, obtaining a stellar temperature of ≃50kK. The stellar wind composition is dominated by helium with ∼20 per cent of hydrogen. The stellar spectrum is highly reddened [ E(B - V) = 2.85mag]. Adopting an absolute magnitude of Mv= -5.7, the star has a luminosity of logL/L = 5.75 and a mass-loss rate of 10–4.7M/yr, and resides at a distance of 6.3kpc. We searched for a possible parent cluster of WR121b and found that this star is located at ≃1° from the young star cluster embedded in the giant Hii region W43 (containing a WN7+a/OB? star - WR121a). We also discovered a bow shock around the O9.5III star ALS9956, located at from the cluster. We discuss the possibility that WR121b and ALS9956 are runaway stars ejected from the cluster in W43.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): line: identification - circumstellar matter - stars: individual: ALS9956 - stars: Wolf-Rayet - open clusters and associations: individual: [BDC99] W43 cluster

Simbad objects: 9

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