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IRAS 18153-1651: an H ii region with a possible wind bubble blown by a young main-sequence B star

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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 th...

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Bibliographic Details
Main Authors: Gvaramadze, Vasilii V. (Author) , Grebel, Eva K. (Author)
Format: Article (Journal)
Language:English
Published: 14 December 2016
In: Monthly notices of the Royal Astronomical Society
Year: 2017, Volume: 466, Issue: 2, Pages: 1857-1867
ISSN:1365-2966
DOI:10.1093/mnras/stw3257
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stw3257
Verlag, kostenfrei, Volltext: https://academic.oup.com/mnras/article/466/2/1857/2687809/IRAS-18153-1651-an-H-ii-region-with-a-possible
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Author Notes:V.V. Gvaramadze, J. Mackey, A.Y. Kniazev, N. Langer, A.-N. Chené, N. Castro, T.J. Haworth and E.K. Grebel
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Summary: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.
Item Description:Gesehen am 31.08.2017
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stw3257

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