Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 119, Number 3, November I 1996
Page(s) 459 - 481
DOI https://doi.org/10.1051/aas:1996259
Published online 15 November 1996
A search for OH maser emission from post-asymptotic giant branch stars DOI: 10.1051/aas:1996259

Astronomy and Astrophysics Supplement Series, Vol. 119, November I 1996, 459-481

A search for OH maser emission from post-asymptotic giant branch stars

P. te Lintel Hekkert and J.M. Chapman
Send offprint requests to: P. te Lintel Hekkert

Australia Telescope National Facility, Parkes Observatory, P.O. Box 276, N.S.W. 2870, Australia
Anglo Australian Observatory, P.O. Box 296, Epping, N.S.W. 2121, Australia

Received July 26, 1995; accepted March 22, 1996

Abstract:

We present a survey for OH maser emission at 18 cm in the direction of 196 IRAS point sources. The primary aim of the survey was to detect OH maser emission from post-asymptotic giant branch (post-AGB) stars. OH emission and/or absorption was detected in the direction of 77 sources of which 57 OH detections were previously unknown, giving an overall detection rate of 39 per cent. Fourteen maser sources associated with evolved stars or planetary nebulae were found, corresponding to 7 per cent of the total observed. These included three planetary nebulae (two new OH detections), nine post-AGB stars (three new OH detections) and two cold OH/IR stars (both previously known). Two sources were of uncertain identification (both new OH detections). The remainder of the OH sources were identified with young stellar objects and with HII regions. The survey included the detection of OH maser emission from HD 101584, an early-type supergiant at high Galactic latitude. For several of the post-AGB stars, changes have occurred in the OH spectral profiles over a period of several years. This is interpreted as evidence for rapid changes in the stellar winds, due either to interactions with stellar companions, novae-like events or rapid stellar evolution.

Key words: masers --- stars: AGB, post AGB --- planetary nebulae --- radio lines: stars


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