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A Profile-based Approach to Finding New Water Fountain Candidates using Databases of Circumstellar Maser Sources

Published online by Cambridge University Press:  07 February 2024

J. Nakashima Open the ORCID record for J. Nakashima [Opens in a new window] ,
H. Fan ,
D. Engels Open the ORCID record for D. Engels [Opens in a new window] ,
Y. Zhang ,
J.-J. Qiu ,
H.-X. Feng ,
J.-Y. Xie ,
H. Imai Open the ORCID record for H. Imai [Opens in a new window]  and
C.-H. Hsia
J. Nakashima*
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Tang Jia Wan, Zhuhai, 519082, P. R. China. CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Sun Yat-Sen University, 2 Duxue Road, Zhuhai 519082, Guangdong Province, PR China
H. Fan
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Tang Jia Wan, Zhuhai, 519082, P. R. China.
D. Engels
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany
Y. Zhang
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Tang Jia Wan, Zhuhai, 519082, P. R. China. CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Sun Yat-Sen University, 2 Duxue Road, Zhuhai 519082, Guangdong Province, PR China
J.-J. Qiu
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Tang Jia Wan, Zhuhai, 519082, P. R. China. CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Sun Yat-Sen University, 2 Duxue Road, Zhuhai 519082, Guangdong Province, PR China
H.-X. Feng
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Tang Jia Wan, Zhuhai, 519082, P. R. China.
J.-Y. Xie
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Tang Jia Wan, Zhuhai, 519082, P. R. China.
H. Imai
Affiliation:
Center for General Education, Institute for Comprehensive Education, Kagoshima University 1-21-30 Korimoto, Kagoshima 890-0065, Japan Amanogawa Galaxy Astronomy Research Center (AGARC), Faculty of Science, Kagoshima University 1-21-30 Korimoto, Kagoshima 890-0065, Japan
C.-H. Hsia
Affiliation:
The Laboratory for Space Research, Faculty of Science, The University of Hong Kong, Cyberport 4, Hong Kong SAR, China
*
email: nakashima.junichi@gmail.com
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Abstract

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Water fountains (WFs) are thought to represent an early stage in the morphological evolution of circumstellar envelopes surrounding low- and intermediate-mass evolved stars. These objects are considered to transition from spherical to asymmetric shapes. Despite their potential importance in this transformation process of evolved stars, there are only a few known examples. To identify new WF candidates, we used databases of circumstellar OH (1612 MHz) and H2O (22.235 GHz) maser sources, and compared the velocity ranges of the two maser lines. Finally, 41 sources were found to have a velocity range for the H2O maser line that exceeded that of the OH maser line. Excluding known planetary nebulae and after reviewing the maser spectra in the original literature, we found for 11 sources the exceedance as significant, qualifying them as new WF candidates.

Keywords

Evolved starsmaserspost-AGB starsAGB stars
Type
Poster 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. 377 - 379
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

Engels, D., & Bunzel, F. 2015, A&A, 582, A68 Google Scholar
Imai, H. 2009, in AGB Stars and Related Phenomena, ed. Ueta, T., Matsunaga, N., & Ita, Y., 62Google Scholar
Yung, B. H. K., Nakashima, J., Imai, H., et al. 2013, ApJ, 769, 20 10.1088/0004-637X/769/1/20CrossRefGoogle Scholar