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

Gvaramadze, V. V. and Mackey, Jonathan and Kniazev, A. Y. and Langer, N. and Chené, A.-N. and Castro, N. and Haworth, T. J. and Grebel, E. K. (2017) IRAS 18153−1651: an H II region with a possible wind bubble blown by a young main-sequence B star. Monthly Notices of the Royal Astronomical Society, 466 (2). pp. 1857-1867. ISSN 0035-8711

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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 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 Type: Article
Uncontrolled Keywords: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Divisions: School of Cosmics Physics > Astronomy and Astrophysics
Date Deposited: 05 Feb 2019 11:00
Last Modified: 05 Feb 2019 11:00

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