A deep search for C<sub>2</sub>H in the oxygen-rich post-AGB star OH 231.8+4.2

doi:10.3389/fspas.2024.1431250

	A deep search for C₂H in the oxygen-rich post-AGB star OH 231.8+4.2
	Yang, Jianchao 1,2; Yang, Xiaofeng1,3 ; Zhu, Cheng 1,4
	2024-06-25
Source Publication	FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
ISSN	2296-987X
Volume	11 Pages:1431250
Contribution Rank	1
Abstract	In carbon-rich environment, C2H emission is seen to be associated with HC3N, but whether it can trace the HC3N molecule in oxygen-rich environment is unknown. Here, we have searched for rotational emission from ethynyl radical (C2H) in the oxygen-rich circumstellar envelope (CSE) of the post-asymptotic giant branch (post-AGB) star OH 231.8+4.2, a renowned galactic proto-planetary nebula (PPN) known to display cyanoacetylene (HC3N) emission. Our observations were conducted using the James Clerk Maxwell Telescope (JCMT), and the total on-source time is 11.9 h. Base on local thermodynamic equilibrium (LTE) excitation analysis, we have calculated the column density and the abundance relative to H-2 for C2H. The calculated column density for C2H is less than 1.4 x 10(13) cm(-2), which corresponds to a fractional abundance, f (C2H), less than 4.5 x 10(-9). This inference suggests that the typical transformation pathway from C2H and C2H2 to HC3N may not play a significant role in O-rich environments. It indicates the presence of alternative, unidentified pathways that contribute to the formation of HC3N in O-rich circumstellar envelopes.
Keyword	post-AGB star circumstellar envelopes (CSEs) column density C2H OH 231.8+4.2
DOI	10.3389/fspas.2024.1431250
Indexed By	SCI
Language	英语
WOS Keyword	OUTFLOW
Funding Project	National SKA Program of China[2022SKA0110203] ; Korea Astronomy and Space Science Institute ; National Key R&D Program of China[2017YFA0402700] ; JCMT[E21AZ002] ; JCMT[M23BP059] ; [2024]
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:001265477400001
Publisher	FRONTIERS MEDIA SA
Funding Organization	National SKA Program of China ; Korea Astronomy and Space Science Institute ; National Key R&D Program of China ; JCMT
Citation statistics
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/6828
Collection	射电天文研究室_理论天体物理研究团组
Corresponding Author	Yang, Xiaofeng
Affiliation	1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Xinjiang Key Lab Radio Astrophys, Urumqi, Peoples R China 4.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci BNLMS, Beijing, Peoples R China
First Author Affilication	Xinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author Affilication	Xinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation GB/T 7714	Yang, Jianchao,Yang, Xiaofeng,Zhu, Cheng. A deep search for C₂H in the oxygen-rich post-AGB star OH 231.8+4.2[J]. FRONTIERS IN ASTRONOMY AND SPACE SCIENCES,2024,11:1431250.
APA	Yang, Jianchao,Yang, Xiaofeng,&Zhu, Cheng.(2024).A deep search for C₂H in the oxygen-rich post-AGB star OH 231.8+4.2.FRONTIERS IN ASTRONOMY AND SPACE SCIENCES,11,1431250.
MLA	Yang, Jianchao,et al."A deep search for C₂H in the oxygen-rich post-AGB star OH 231.8+4.2".FRONTIERS IN ASTRONOMY AND SPACE SCIENCES 11(2024):1431250.

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