Other
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..451c&link_type=abstract
Astronomical Journal, vol. 85, Apr. 1980, p. 451-453.
Other
28
Companion Stars, Hot Stars, Interstellar Masers, Line Spectra, Molecular Spectra, Radio Emission, Stellar Spectra, Water Masers, Absorption Spectra, Emission Spectra, Oxygen Spectra, Spectrum Analysis, Variable Stars
Scientific paper
A sample of symbiotic stars has been searched for maser emission from the 1665 and 1667 MHz OH mainlines, the 22-GHz H2O line, and the 43-GHz SiO line. R Aqr remains the sole symbiotic for which maser emission has been detected. Its SiO spectrum reveals a pedestal of emission with a narrow superposed peak at V(LSR) -26.4 plus or minus 0.7 km/s. The line's existence and the pedestal feature are both characteristic of SiO lines found in late-type variables by Snyder et al. (1978). For the other symbiotic stars, it is possible that conditions favorable for maser emission have been suppressed by the presence of a hot companion. Alternatively these findings may argue against the presence of late-type variables in symbiotic stars. In either case, R Aqr seems to be in a class by itself. The suggestion that R Aqr is a binary cannot be confirmed, since the spectral feature has not shifted noticeably in the two years since the observations by Lepine, LeSqueren, and Scalise (1978).
Cohen Norman L.
Ghigo Frank D.
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