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The Astrometric Animation of Water Masers toward the Mira Variable BX Cam

Published online by Cambridge University Press:  07 February 2024

Shuangjing Xu Open the ORCID record for Shuangjing Xu [Opens in a new window] ,
Hiroshi Imai Open the ORCID record for Hiroshi Imai [Opens in a new window] ,
Youngjoo Yun Open the ORCID record for Youngjoo Yun [Opens in a new window] ,
Bo Zhang ,
María J. Rioja ,
Richard Dodson Open the ORCID record for Richard Dodson [Opens in a new window] ,
Se-Hyung Cho ,
Jaeheon Kim Open the ORCID record for Jaeheon Kim [Opens in a new window] ,
Lang Cui  and
Andrey M. Sobolev
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Shuangjing Xu*
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Daejeon 34055, Republic of Korea. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China
Hiroshi Imai
Affiliation:
Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan
Youngjoo Yun
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Daejeon 34055, Republic of Korea.
Bo Zhang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China
María J. Rioja
Affiliation:
The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia, 6009, Australia CSIRO Astronomy and Space Science, PO Box 1130, Bentley WA 6102, Australia Observatorio Astronómico Nacional (IGN), Alfonso XII, 3 y 5, 28014 Madrid, Spain
Richard Dodson
Affiliation:
The University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia, 6009, Australia
Se-Hyung Cho
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Daejeon 34055, Republic of Korea. Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
Jaeheon Kim
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Daejeon 34055, Republic of Korea.
Lang Cui
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, People’s Republic of China
Andrey M. Sobolev
Affiliation:
Ural Federal University, 19 Mira Street, 620002 Ekaterinburg, Russia
James O. Chibueze
Affiliation:
Centre for Space Research, North-West University, Potchefstroom 2520, South Africa University of Nigeria, Carver Building, 1 University Road, Nsukka, Nigeria
Dong-Jin Kim
Affiliation:
Massachusetts Institute of Technology Haystack Observatory, Westford, MA 01886, USA Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
Kei Amada
Affiliation:
Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan
Jun-ichi Nakashima
Affiliation:
Sun Yat-sen University, 2 Daxue Road, Tangjia, Zhuhai, People’s Republic of China
Gabor Orosz
Affiliation:
Joint Institute for VLBI ERIC, Oude Hoogeveensedijk 4, 7991PD Dwingeloo, Netherlands
Miyako Oyadomari
Affiliation:
Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan
Sejin Oh
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Daejeon 34055, Republic of Korea.
Yoshinori Yonekura
Affiliation:
Center for Astronomy, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
Yan Sun
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China University of Chinese Academy of Sciences, Shijingshan, Beijing, 100049, People’s Republic of China
Xiaofeng Mai
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China University of Chinese Academy of Sciences, Shijingshan, Beijing, 100049, People’s Republic of China
Jingdong Zhang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China University of Chinese Academy of Sciences, Shijingshan, Beijing, 100049, People’s Republic of China
Shiming Wen
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China
Taehyun Jung
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Daejeon 34055, Republic of Korea.
*
email: sjxuvlbi@gmail.com
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Abstract

We report VLBI monitoring observations of the 22 GHz H2O masers toward the Mira variable BX Cam. Data from 37 epochs spanning ∼3 stellar pulsation periods were obtained between May 2018 and June 2021 with a time interval of 3–4 weeks. In particular, the VERA dual-beam system was used to measure the kinematics and parallaxes of the H2O maser features. The obtained parallax, 1.79±0.08 mas, is consistent with Gaia EDR3 and previous VLBI measurements. The position of the central star was estimated relied on Gaia EDR3 data and the center position of the 43 GHz SiO maser ring imaged with KVN. Analysis of the 3D maser kinematics revealed an expanding circumstellar envelope with a velocity of 13±4 km s−1 and significant spatial and velocity asymmetries. The H2O maser animation achieved by our dense monitoring program manifests the propagation of shock waves in the circumstellar envelope of BX Cam.

Keywords

masersstars: individual (BX Cam)stars:evolvedastrometrykinematics
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 328 - 332
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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