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2020天文年會
中研院天文所 國際會議廳

論文摘要

Diagnosing Triggered Star Formation in the Galactic HII region Sh 142

[ Oral ]

Tanvi Sharma(300 Zhongda Road, Graduate Institute of Astronomy, National Central University, Zhongli 32001 Taoyuan, Taiwan); Wen-Ping Chen(300 Zhongda Road, Graduate Institute of Astronomy, National Central University, Zhongli 32001 Taoyuan, Taiwan); Neelam Panwar (Aryabhatta Research Institute of Observational Sciences~(ARIES), Manora Peak, Nainital 263 002, India); Yan Sun (Purple Mountain Observatory, Nanjing 210033, China); Yu Gao (Purple Mountain Observatory, Nanjing 210033, China)

Star formation does not occur in isolation. In a molecular cloud complex, there is usually an intricate interplay between gas and dust, newly formed stars, and remnant clouds which may or may not produce the next-generation stars. Massive stars, with copious UV radiation and fierce stellar winds, may disperse surrounding clouds, making subsequent star formation impossible. On the other hand, given proper conditions, the ionization of the surface layer of a nearby cloud, i.e., a bright-rimmed cloud, may lead to an implosive shock front to prompt and give birth to a new generation of stars. Diagnostic signposts of such a triggered star formation include the lining up geometry of the massive star(s), the bright-rimmed cloud, and the young stars in an age sequence. Here we report such evidence in Sharpless 142, a prominent HII region at 2.6 kpc, associated with the bright rimmed cloud BRC 43, and the open cluster NGC 7380. Young stellar objects exhibit excess of infrared emission because of circumstellar disk/envelop and can be identified using Infrared data. Our data include (1) 2MASS, WISE, optical photometry of the star cluster members and of the young stellar population in the region, and (2) CO isotopic line observations for spatial correlation with the molecular gas. We also study the kinematics of molecular cloud and found two kinematically and spatially separated cores belonging to same cloud ciomplex. We present the spectral energy distributions of embedded protostars along with their spatial distribution. Keywords- HII region, Ionisation front(IF), Bright rimmed cloud(BRC), Triggered star formation, sequential star formation