2021/04/15 by Anna I. Buslaeva, A. I. Buslaeva, M. S. Kirsanova +3
Physics and Astronomy · #Abundance (ecology) #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Emission spectrum #Line (geometry) #Molecular cloud #Radial velocity #Scientific Research and Discoveries #Stars #astro-ph.GA
paper · pdf · doi:10.1134/s1063772921060020
8 pages, accepted by Astronomy Reports
arxiv created 2021/04/15 · openalex created_date 2021/04/26 · openalex publication_date 2021/06/01 · arxiv updated 2021/06/30 · openalex updated_date 2026/08/05
Abstract We present the results of the ethynyl (C2H) emission line observations towards the S255 and S257 HII regions and the molecular cloud between them. Radial profiles of line brightness, column density, and abundance of C2H are obtained. We show that the radial profile of the ethynyl abundance is almost flat towards the HII regions and drops by a factor of two towards the molecular cloud. At the same time, we find that the ethynyl abundance is at maximum towards the point sources in the molecular cloud—the stars with emission lines or emitting in X-ray. Line profiles are consistent with the assumption that both HII regions have front and back neutral walls those move relative to each other.