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Observations of Molecular CN toward S-type Asymptotic Giant Branch Stars

文献类型：期刊论文

作者Feng, Yanan5,6; Li, Xiaohu2,4,6; Yang, Xiaofeng2,4,6; Millar, Tom J.3; Szczerba, Ryszard4,6,7; Qin, Sheng-Li1; Jiang, Xuejian9; Quan, Donghui6,9; Tuo, Juan4,6; Miao, Zhenzhen4,6
刊名ASTRONOMICAL JOURNAL
出版日期2024-12-01
卷号168期号:6页码:285
ISSN号0004-6256
DOI10.3847/1538-3881/ad8ba6
产权排序1
英文摘要S-type asymptotic giant branch (AGB) stars are defined by their carbon-to-oxygen (C/O) ratio approaching unity. However, observations of circumstellar molecules in these stars are limited and challenging. In this study, we used the James Clerk Maxwell Telescope to search for cyanide (CN) in 12 selected S-type AGB stars, with only 4 of these stars displaying CN spectral line signals. The column density and fractional abundance of CN were calculated assuming local thermodynamic equilibrium, and the average CN-to-hydrogen-cyanide (HCN) abundance ratio of the four sources is about 0.036. We investigate, for the first time, the relationship between CN and HCN fractional abundances in all types of AGB stars, finding that the ratio is similar in O-rich and S-type stars, while those in C-rich stars are quite different. This result supports the idea that the level of HCN photodissociation plays a crucial role in determining the CN abundance in the circumstellar envelopes of AGB stars at various stages of their evolution.
WOS关键词MASS-LOSS RATES ; AGB STARS ; BEARING MOLECULES ; LINE EMISSION ; CIRCUMSTELLAR ; ENVELOPES ; CHEMISTRY ; EVOLUTION ; HCN ; PROFILES
资助项目Natural Science Foundation of Xinjiang Uygur Autonomous Region ; Korea Astronomy and Space Science Institute ; National Key R&D Program of China[2017YFA0402700] ; Science and Technology Facilities Council of the United Kingdom ; JCMT[E21AZ002] ; National Science Foundation of China[12473025] ; National SKA Program of China[2022SKA0110203] ; National Key R&D Intergovernmental Cooperation Program of China[2023YFE0102300] ; Leverhulme Trust ; STFC[ST/T000198/1] ; STFC[2023] ; Leading Innovation and Entrepreneurship Team of Zhejiang Province of China[2023R01008] ; [2022D01B221]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001362682600001
出版者IOP Publishing Ltd
资助机构Natural Science Foundation of Xinjiang Uygur Autonomous Region ; Korea Astronomy and Space Science Institute ; National Key R&D Program of China ; Science and Technology Facilities Council of the United Kingdom ; JCMT ; National Science Foundation of China ; National SKA Program of China ; National Key R&D Intergovernmental Cooperation Program of China ; Leverhulme Trust ; STFC ; Leading Innovation and Entrepreneurship Team of Zhejiang Province of China
源URL[http://ir.xao.ac.cn/handle/45760611-7/7162]  
专题天体化学研究团组
射电天文研究室_理论天体物理研究团组
通讯作者Li, Xiaohu; Yang, Xiaofeng
作者单位1.Yunnan Univ, Dept Astron, Kunming 650091, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China
3.Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Belfast BT7 1NN, North Ireland
4.Xinjiang Key Lab Radio Astrophys, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
7.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Rabianska 8, PL-87100 Torun, Poland
8.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sect 4,Roosevelt Rd, Taipei, Taiwan
9.Res Ctr Astron Comp, Zhejiang Lab, Hangzhou 311121, Peoples R China
推荐引用方式
GB/T 7714		 Feng, Yanan,Li, Xiaohu,Yang, Xiaofeng,et al. Observations of Molecular CN toward S-type Asymptotic Giant Branch Stars[J]. ASTRONOMICAL JOURNAL,2024,168(6):285.
APA Feng, Yanan.,Li, Xiaohu.,Yang, Xiaofeng.,Millar, Tom J..,Szczerba, Ryszard.,...&Liu, Xiang.(2024).Observations of Molecular CN toward S-type Asymptotic Giant Branch Stars.ASTRONOMICAL JOURNAL,168(6),285.
MLA Feng, Yanan,et al."Observations of Molecular CN toward S-type Asymptotic Giant Branch Stars".ASTRONOMICAL JOURNAL 168.6(2024):285.

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