A high-sensitivity OH 5-cm line survey in late-type stars

Abstract

We have undertaken a comprehensive search for 5-cm excited OH maser emission from evolved stars representative of various stages of late stellar evolution. Observed sources were selected from known 18-cm OH sources. This survey was conducted with the 100-m Effelsberg telescope to achieve high signal to noise ratio observations and a sensitivity limit of about 0.05 to 0.1 Jy. A total of 64 stellar sources were searched for both main line and satellite line emission. We confirm the previous detection of 5 cm OH in Vy 2-2, do not confirm emission from NML-Cyg and do not report any other new detection within the above sensitivity limit. Implications of these results on the pumping mechanism of the OH radical in circumstellar envelopes are briefly discussed.

arXiv comment8 pages, 5 figures, A&A in press

References in corpus (2)

• The Distance Scale of Planetary Nebulae
• 5cm OH masers as diagnostics of physical conditions in star-forming regions

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• Detection of 4765 MHz OH Emission in a Pre-Planetary Nebula -- CRL 618
• Excited Hydroxyl Outflow in the High-Mass Star-Forming Region G34.26+0.15