SIMBAD references

1997A&A...322..159S - Astronomy and Astrophysics, volume 322, 159-166 (1997/6-1)

H2O maser emission from irregular variables.

SZYMCZAK M. and ENGELS D.

Abstract (from CDS):

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<400 pc) 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/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.

Abstract Copyright:

Journal keyword(s): masers - stars: circumstellar matter - stars: mass-loss - stars: AGB, post-AGB - radio lines: stars

VizieR on-line data: <Available at CDS (J/A+A/322/159): table2>

Simbad objects: 75

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