2008/03/11 by Jose F. Gomez, José F. Gómez, Olga Suarez +10 · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1088/0004-6256/135/6/2074
33 pages, 10 figures. Accepted by The Astronomical Journal
arxiv created 2008/03/11 · openalex publication_date 2008/05/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We present Very Large Array observations of H 2 O and OH masers as well as radio continuum emission at 1.3 and 18 cm toward three sources previously cataloged as planetary nebulae (PNe) and in which single-dish detections of H 2 O masers have been reported: IRAS 17443−2949, IRAS 17580−3111, and IRAS 18061−2505. Our goal was to unambiguously confirm their nature as water-maser-emitting PNe, a class of objects of which only two bona fide members were previously known. We detected and mapped H 2 O maser emission toward all three sources, while OH maser emission is detected in IRAS 17443−2949 and IRAS 17580−3111 as well as in other two objects within the observed fields: IRAS 17442−2942 (unknown nature) and IRAS 17579−3121 (also cataloged as a possible PN). We found radio continuum emission associated only with IRAS 18061−2505. Our results confirm IRAS 18061−2505 as the third known case of a PN associated with H 2 O maser emission. The rest of the studied sources are not likely to trace PNe. The three known water-maser-emitting PNe have clear bipolar morphologies, which suggests that water maser emission in these objects is related to non-spherical mass-loss episodes. We speculate that these bipolar water-maser-emitting PNe would have "water-fountain" asymptotic giant branch (AGB) and post-AGB stars as their precursors. A note of caution is given for other objects that have been classified as OHPNe (objects with both OH maser and radio continuum emission that could be extremely young PNe) based on single-dish observations, since interferometric data of both OH masers and continuum are necessary for a proper identification as members of this class.