IRAS 18153-1651

• Verfasst von: Gvaramadze, Vasilii V. [VerfasserIn]
• Verfasst von: Grebel, Eva K. [VerfasserIn]
• Titel: IRAS 18153-1651
• Titelzusatz: an H ii region with a possible wind bubble blown by a young main-sequence B star
• Verf.angabe: V.V. Gvaramadze, J. Mackey, A.Y. Kniazev, N. Langer, A.-N. Chené, N. Castro, T.J. Haworth and E.K. Grebel
• E-Jahr: 2017
• Jahr: 14 December 2016
• Umfang: 11 S.
• Fussnoten: Gesehen am 31.08.2017
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2017
• Band/Heft Quelle: 466(2017), 2, Seite 1857-1867
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stw3257
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1562959387

Abstract

We report the results of spectroscopic observations and numerical modelling of the H ii region IRAS 18153−1651. Our study was motivated by the discovery of an optical arc and two main-sequence stars of spectral type B1 and B3 near the centre of IRAS 18153−1651. We interpret the arc as the edge of the wind bubble (blown by the B1 star), whose brightness is enhanced by the interaction with a photoevaporation flow from a nearby molecular cloud. This interpretation implies that we deal with a unique case of a young massive star (the most massive member of a recently formed low-mass star cluster) caught just tens of thousands of years after its stellar wind has begun to blow a bubble into the surrounding dense medium. Our 2D, radiation-hydrodynamics simulations of the wind bubble and the H ii region around the B1 star provide a reasonable match to observations, both in terms of morphology and absolute brightness of the optical and mid-infrared emission, and verify the young age of IRAS 18153−1651. Taken together our results strongly suggest that we have revealed the first example of a wind bubble blown by a main-sequence B star.