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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A new Wolf-Rayet star and its circumstellar nebula in Aquila
Monthly Notices of the Royal Astronomical Society, Volume 403, No. 2, Year 2010
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Description
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 WR 121b). We analysed the spectrum of WR 121b by using the Potsdam Wolf-Rayet model atmospheres, obtaining a stellar temperature of ≃50 kK. The stellar wind composition is dominated by helium with ∼20 per cent of hydrogen. The stellar spectrum is highly reddened [. E(B-V) = 2.85 mag]. Adopting an absolute magnitude of Mv=-5.7, the star has a luminosity of log L/L⊙= 5.75 and a mass-loss rate of 10-4.7 M⊙ yr-1, and resides at a distance of 6.3 kpc. We searched for a possible parent cluster of WR 121b and found that this star is located at ≃1° from the young star cluster embedded in the giant H ii region W43 (containing a WN7+a/OB? star - WR 121a). We also discovered a bow shock around the O9.5III star ALS 9956, located at from the cluster. We discuss the possibility that WR 121b and ALS 9956 are runaway stars ejected from the cluster in W43. © 2010 The Authors. Journal compilation © 2010 RAS.
Authors & Co-Authors
Gvaramadze, V. V.
Russian Federation, Moscow
Lomonosov Moscow State University
Russian Federation, Moscow
Isaac Newton Institute of Chile
Kniazev, Alexei Yu
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Hamann, Wolf Rainer
Germany, Potsdam
Universität Potsdam
Berdnikov, Leonid N.
Russian Federation, Moscow
Lomonosov Moscow State University
Russian Federation, Moscow
Isaac Newton Institute of Chile
Fabrika, Sergei N.
Russian Federation, Nizhny Arkhyz
Special Astrophysical Observatory, Russian Academy of Sciences
Valeev, Azamat F.
Russian Federation, Nizhny Arkhyz
Special Astrophysical Observatory, Russian Academy of Sciences
Statistics
Citations: 25
Authors: 6
Affiliations: 6
Identifiers
Doi:
10.1111/j.1365-2966.2009.16126.x
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cohort Study