Simultaneous VLBI Astrometry of H2O and SiO Masers toward the Semiregular Variable R Crateris

doi:10.3847/2041-8213/aae58b

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	Simultaneous VLBI Astrometry of H2O and SiO Masers toward the Semiregular Variable R Crateris
	Kim, Dong-Jin 6,7,8; Cho, Se-Hyung 7,8; Yun, Youngjoo 7; Choi, Yoon Kyung 6; Yoon, Dong-Hwan 5,7; Kim, Jaeheon 1; Dodson, Richard 4; Rioja, Maria J.2,3,4; Yang, Haneul 5,7; Yoon, Suk-Jin 8
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2018-10-20
卷号	866 期号:2
关键词	Instrumentation: Interferometers Masers Stars: Individual (r Crateris) Stars: Late-type
ISSN号	2041-8205
DOI	10.3847/2041-8213/aae58b
英文摘要	We obtained, for the first time, astrometrically registered maps of the 22.2 GHz H2O and 42.8, 43.1, and 86.2 GHz SiO maser emission toward the semiregular b-type variable (SRb) R Crateris, at three epochs (2015 May 21, and 2016 January 7 and 26) using the Korean Very-long-baseline Interferometry Network. The SiO masers show a ring-like spatial structure, while the H2O maser shows a very asymmetric one-side outflow structure, which is located at the southern part of the ring-like SiO maser feature. We also found that the 86.2 GHz SiO maser spots are distributed in an inner region, compared to those of the 43.1 GHz SiO maser, which is different from all previously known distributions of the 86.2 GHz SiO masers in variable stars. The different distribution of the 86.2 GHz SiO maser seems to be related to the complex dynamics caused by the overtone pulsation mode of the SRb R Crateris. Furthermore, we estimated the position of the central star based on the ring fitting of the SiO masers, which is essential for interpreting the morphology and kinematics of a circumstellar envelope. The estimated stellar coordinate corresponds well to the position measured by Gaia.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000447583800001
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32225]
专题	中国科学院上海天文台
通讯作者	Cho, Se-Hyung
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.CSIRO Astron & Space Sci, 26 Dick Perry Ave, Kensington, WA 6151, Australia 3.Observ Astron Nacl IGN, Alfonso 12,3 & 5, E-28014 Madrid, Spain 4.Univ Western Australia, Int Ctr Radio Astron Res, M468,35 Stirling Hwy, Crawley, WA 6009, Australia 5.Seoul Natl Univ, Dept Phys & Astron, Astron Program, 1 Gwanakro, Seoul 08826, South Korea 6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 7.Korea Astron & Space Sci Inst, 776 Daedeok Daero, Daejeon 34055, South Korea 8.Yonsei Univ, Dept Astron, 50 Yonsei Ro, Seoul 03722, South Korea
推荐引用方式 GB/T 7714	Kim, Dong-Jin,Cho, Se-Hyung,Yun, Youngjoo,et al. Simultaneous VLBI Astrometry of H2O and SiO Masers toward the Semiregular Variable R Crateris[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,866(2).
APA	Kim, Dong-Jin.,Cho, Se-Hyung.,Yun, Youngjoo.,Choi, Yoon Kyung.,Yoon, Dong-Hwan.,...&Yoon, Suk-Jin.(2018).Simultaneous VLBI Astrometry of H2O and SiO Masers toward the Semiregular Variable R Crateris.ASTROPHYSICAL JOURNAL LETTERS,866(2).
MLA	Kim, Dong-Jin,et al."Simultaneous VLBI Astrometry of H2O and SiO Masers toward the Semiregular Variable R Crateris".ASTROPHYSICAL JOURNAL LETTERS 866.2(2018).