A Massive Young Runaway Star in W49 North

We analyzed high-angular resolution 45.5 GHz images of the W49 North massive star-forming region obtained in 1998 and 2016 with the Very Large Array. Most of the ultracompact H ii regions show no detectable changes over the time interval of the observations. However, subcomponents B1, B2, G2a, and G...

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Bibliographic Details
Published in:The Astrophysical journal 2020-02, Vol.890 (2), p.165
Main Authors: Rodríguez, Luis F., Galván-Madrid, Roberto, Sanchez-Bermudez, Joel, Pree, Christopher G. De
Format: Article
Language:English
Subjects:
Angular resolution
Astrophysics
Change detection
Comets
Galactic radio sources
H II regions
Massive stars
Proper motions
Radio astrometry
Star formation
Stars & galaxies
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Summary:We analyzed high-angular resolution 45.5 GHz images of the W49 North massive star-forming region obtained in 1998 and 2016 with the Very Large Array. Most of the ultracompact H ii regions show no detectable changes over the time interval of the observations. However, subcomponents B1, B2, G2a, and G2c have increased its peak flux densities by values in the range of 3.8%-21.4%. Most interestingly, the cometary region C clearly shows proper motions that at the distance of the region are equivalent to a velocity of 76 6 km s−1 in the plane of the sky. We interpret this region as the ionized bowshock produced by a runaway O6 ZAMS star that was ejected from the eastern edge of Welch's ring about 6400 yr ago.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab7011