Wide Field CO Mapping in the Region of IRAS 19312+1950
作者： Jun-ichi Nakashima , Dmitry A. Ladeyschikov , Andrej M. Sobolev , Yong Zhang , Chih-Hao Hsia
DOI: 10.3847/0004-637X/825/1/16
关键词:
摘要: We report the results of a wide field CO mapping in region IRAS 19312+1950. This object exhibits SiO/H$_2$O/OH maser emission, and is embedded chemically-rich molecular component, which origin still unknown. In order to reveal entire structure gas mass surrounding component for first time, we have mapped around 19312+1950 $^{12}$CO $J=1-0$, $^{13}$CO $J=1-0$ C$^{18}$O lines using Nobeyama 45m telescope. conjunction with archival maps, investigated size up $20' \times 20'$ this object. calculated assuming LTE condition, stellar velocity against interstellar medium an analytic model bow shock, absolute luminosity latest data trigonometric parallax distance. The derived gas-mass (225 M$_{\odot}$ $-$ 478 M$_{\odot}$) relatively large ($2.63\times10^{4}$ L$_{\odot}$) suggest that central source seems be red supergiant (RSG) rather than asymptotic giant branch (AGB) star or post-AGB star.
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