Mathematics – Probability
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ycat..33220159s&link_type=abstract
VizieR On-line Data Catalog: J/A+A/322/159. Originally published in: 1997A&A...322..159S
Mathematics
Probability
Stars: Variable, Stars: Masers
Scientific paper
We have performed a search for the 22 GHz water maser line among 72 optically identified irregular and semiregular red variables. New detections were made of five stars, while only four of nine objects previously known as maser sources were redetected. The probability for the detection of H2O maser emission increases with V light amplitude, and with H-K and K-[12] colours just as in regular Mira and semiregular variables of SRa- and SRb-types. The detection rate of water masers is about 25% for nearby Lb objects (D<400pc) in the sample, comparable to that observed in the SRa and SRb stars. No masers were detected in objects with mass loss rates <=4x10-8M&sun;/yr. Maser luminosities are 1041-1043photons/s similar to that of the bluest Miras and typical SRa and SRb stars showing water maser emission. A comparison of our data on irregular stars with those previously obtained on SRa and SRb variables suggests that most radio and infrared properties are indistinguishable among both classes of objects. (1 data file).
Engels Dieter
Szymczak Marian
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