A search for water and mainline masers in OH/IR star mimics with strong silicate emission features

Details A search for water and mainline masers in OH/IR star mimics with strong silicate emission features A search for water and mainline masers in OH/IR star mimics with strong silicate emission features

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..439l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 2, pp. 439-446.

Astronomy and Astrophysics

Astronomy

9

Masers, Stars: Agb And Post-Agb, Circumstellar Matter, Stars: Late-Type, Infrared: Stars, Radio Lines: Stars

Scientific paper

IRAS sources with a strong 9.7-μm silicate emission feature have a low-resolution spectral type of 28 or 29, and appear to be associated with oxygen-rich circumstellar shells. Yet ~=40 per cent of those searched at Arecibo for 1612-MHz emission have none, despite red IR colours, (25-12) mu>-0.55, that point to a thick shell. We report on a water and mainline OH maser search of a complete sample of these OH/IR star colour mimics, where we find seven new water and five new mainline masers. In aggregate, just 10/60 (17 per cent) of this sample are without any kind of detected maser. The frequency of water and mainline masers in these mimics is about half that in OH/IR stars with the same colour, a result that independently confirms that the shells of mimics are in some way different from those of OH/IR stars. Combining these results with other work on the incidence of masers in O-rich shells, we suggest that the percentage of maserless shells increases from ~=11 to ~=25 per cent at (25-12) mum=-0.5.

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