Time variation of the H2O and SiO masers in late-type stars

Details Time variation of the H2O and SiO masers in late-type stars Time variation of the H2O and SiO masers in late-type stars

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159..166g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 166-174.

Astronomy and Astrophysics

Astrophysics

41

Late Stars, Microwave Emission, Secular Variations, Silicon Oxides, Variable Stars, Water Masers, Microwave Spectra, Molecular Collisions, Shock Waves

Scientific paper

The results of six years of monitoring of the 22-GHz H2O maser, and less extensive monitoring of the 43-GHz SiO line, of ten late-type variables (o Cet, R Dor, L2 Pup, VY CMa, R Crt, W Hya, U Her, AH Sco, VX Sgr, R Aql) are presented. The observations were made with the 13.2 m Itapetinga Radiotelescope, Brazil. The variability curves are compared with visual curves from the Association Francaise des Observateurs d'Etoiles Variables. Aperiodic variability of the H2O maser, spanning several cycles of the stellar pulsation (R Crt), or superperiodic behavior with periods equal to multiples of the fundamental period (R Aql, W Hya) have been noted. These results can be understood in terms of the models of Wood (1979) and Willson and Hill (1979) for shock wave propagation into the envelopes.

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