A Search for Water and Mainline OH Masers from OH / Infrared Star Colour Mimics

Details A Search for Water and Mainline OH Masers from OH / Infrared Star Colour Mimics A Search for Water and Mainline OH Masers from OH / Infrared Star Colour Mimics

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..161l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 1/NOV1, P. 161, 1993

Astronomy and Astrophysics

Astronomy

19

Masers - Circumstellar Matter - Infrared: Interstellar: Continuum - Radio Lines: Stars

Scientific paper

About 40 per cent of colour-selected IRAS sources are without 161 2-MHz masers, despite IR colours that are indicative of thick circumstellar shells, and often despite spectral classifications showing that they are O-rich. We report here on a search for water and mainline OH masers from the 26 OH/IR star colour mimics identified by Lewis with a 2n-3n LRS type. We find water masers in six, and mainline masers in a further five. These 11 sources are indubitably O-rich, and many have a velocity range characteristic of, and appropriate to, masers associated with circumstellar shells. However, 17 per cent of 2n-3n sources appear to have no circumstellar masers; we estimate that 11 per cent may never exhibit a maser.

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