Kashima 34-m Water Maser Survey of Late-Type Stars

Details Kashima 34-m Water Maser Survey of Late-Type Stars Kashima 34-m Water Maser Survey of Late-Type Stars

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..517t&link_type=abstract

Publications of the Astronomical Society of Japan, vol.53, no. 3, p. 517-533

Astronomy and Astrophysics

Astronomy

12

Masers, Radio Lines: Stars, Stars: Circumstellar Shells, Stars: Late-Type, Stars: Mass-Loss

Scientific paper

This paper presents new results of a water maser survey of late-type stellar objects at 22.235GHz with the Kashima 34-m radio telescope. We have detected 179 out of 643 observed sources, including 32 new detections. The sources were selected in terms of the IRAS flux density and colors of late-type stars, involving optically observable Mira/semiregular variables, IRC objects, OH/IR sources and protoplanetary nebulae. We found the highest H2O detection rate for the type of stars with a thin dust envelope (Mira/semiregular variables) among other types of sources. This is attributed to the smaller distances to such stars in the sample. The velocity spread of the H2O maser profile has an increasing tendency with the IRAS color, though it becomes more difficult to access this color dependence beyond an edge of the transition of the (oxygen-rich) Asymptotic Giant Branch stars to protoplanetary nebulae in the two-color diagram.

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