Astronomy and Astrophysics, volume 505, 217-225 (2009/10-1)
Water maser detections in southern candidate post-AGB stars and planetary nebulae.
SUAREZ O., GOMEZ J.F., MIRANDA L.F., TORRELLES J.M., GOMEZ Y., ANGLADA G. and MORATA O.
Abstract (from CDS):
We study the incidence and characteristics of water masers in the envelopes of stars in the post-AGB and PN evolutionary stages. We used the 64-m antenna in Parkes (Australia) to search for water maser emission at 22GHz, towards a sample of 74 sources with IRAS colours characteristic of post-AGB stars and PNe, at declination ←32°. In our sample, 39% of the sources are PNe or PNe candidates, and 50% are post-AGB stars or post-AGB candidates. We detected four new water masers, all of them in optically obscured sources: three are in PNe candidates (IRAS 12405-6219, IRAS 15103-5754, and IRAS 16333-4807) and one is in a post-AGB candidate (IRAS 13500-6106). The PN candidate IRAS 15103-5754 has water fountain characteristics and could be the first PN of this class found. We confirm the trend suggested in Paper I that water maser emission during the post-AGB phase is more likely to be present in obscured sources with massive envelopes than in objects with optical counterpart. We propose an evolutionary scenario for water masers in the post-AGB and PNe stages, in which ``water fountain'' masers could develop during the post-AGB and early PN stages. Later PNe would exhibit lower velocity maser emission, both along jets and close to the central objects, with only the central masers remaining in more evolved PNe.
masers - surveys - stars: AGB and post-AGB - stars: mass-loss - planetary nebulae: general
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