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- Title
A Profile-based Approach to Finding New Water Fountain Candidates using Databases of Circumstellar Maser Sources.
- Authors
Nakashima, J.; Fan, H.; Engels, D.; Zhang, Y.; Qiu, J.-J.; Feng, H.-X.; Xie, J.-Y.; Imai, H.; Hsia, C.-H.
- Abstract
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.
- Subjects
FOUNTAINS; MASERS; PLANETARY nebulae; ASYMPTOTIC giant branch stars; DATABASES
- Publication
Proceedings of the International Astronomical Union, 2022, Vol 18, Issue S380, p377
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921323002065