A multiwavelength study of the star forming H II region Sh2-82

• Published in: Research in astronomy and astrophysics Vol. 12; no. 6; pp. 651 - 660
• Main Authors: Yu, Nai-Ping, Wang, Jun-Jie
• Format: Journal Article
• Language: English
• Published: NAOC-TU Joint Center for Astrophysics, Lhasa 850000, China 01.06.2012; National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
• Subjects: 光谱能量分布; 初始质量函数; 多波长; 恒星形成; 星际介质; 红外弹; 触发机制; 辐射驱动内爆; ISM:clouds—nebulae:HⅡ region—individual:Sh2-82—stars:formation
• ISSN: 1674-4527; 2397-6209
• DOI: 10.1088/1674-4527/12/6/005

Based on a multiwavelength study, the interstellar medium and young stel- lar objects （YSOs） around the H II region Sh2-82 have been analyzed. Two molecular clumps were found from the archival data of the Galactic Ring Survey, and using the Two Micron All-Sky Survey catalog, we found two corresponding young clusters embedded in the molecular clumps. The very good relations between CO emission, infrared shells and YSOs suggest that it is probably a triggered star formation region from the expansion of Sh2-82. We further used the data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire from Spitzer to study the YSOs within the two clumps, confirming star formation in this region. By spectral energy distribution fits to each YSO candidate with infrared excess, we derived the slope of the initial mass function. Finally, comparing the H II region＇s dynamical age and the fragmenta- tion time of the molecular shell, we discard the ＂collect and collapse＂ process as being the triggering mechanism for YSO formation. Sh2-82 can be a mixture of other pro- cesses such as radiative-driven implosion and/or collisions with pre-existing clumps.