2001/09/06 by James M. De Buizer, Andrew J. Walsh, Robert K. Pina +2 · 23 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Circumstellar disk #Maser #Outflow #Position angle #Star formation #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/324273
published in The Astrophysical Journal 564(1), 327-332 (IOP Publishing) · 12 pages, 2 figures, Accepted for publication in ApJ
arxiv created 2001/09/06 · openalex publication_date 2002/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
G339.88-1.26 is considered to be a good candidate for a massive star with a circumstellar disk. This has been supported by the observations of linearly distributed methanol maser spots believed to delineate this disk and mid-infrared observations that have discovered a source at this location that is elongated at the same position angle as the methanol maser distribution. We used the mid-infrared imager/spectrometer OSCIR at Keck Observatory to make high-resolution images of G339.88-1.26. We resolve the mid-infrared emission into three sources within 1 5 of the location of the masers. We determine that the methanol masers are most likely not located in a circumstellar disk. Furthermore, we find that the observed radio continuum emission most likely comes from two sources in close proximity to each other. One source is an unobscured massive star with an extended H II region that is responsible for the peak in the radio continuum emission. A second source is embedded and centered on the elongation in the radio continuum emission that is believed to be tracing an outflow in this region.