Time variations of the 22-GHz H2O maser emission spectrum of the star S Persei

Details Time variations of the 22-GHz H2O maser emission spectrum of the star S Persei Time variations of the 22-GHz H2O maser emission spectrum of the star S Persei

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..111c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 183, Apr. 1978, p. 111-118.

Astronomy and Astrophysics

Astronomy

11

Emission Spectra, Infrared Spectra, Light Curve, Stellar Spectra, Water Masers, Microwave Emission, Molecular Spectra, Stellar Envelopes, Stellar Models, Superhigh Frequencies, Time Dependence

Scientific paper

Time variations of the 22-GHz water-vapor maser spectrum of the supergiant star S Per are presented for the period from September 1974 to March 1977, together with the light curve for the same period. Some infrared data for 1.2-10 microns are also given. Individual spectral components vary with different phases, and with phase delays between themselves and the optical emission of up to a few hundred days. It is difficult to account for these observations by a simple radiatively pumped maser model, and collisional processes are probably involved. The spectrum is consistent with models in which the H2O molecules are situated in an expanding and/or rotating circumstellar envelope.

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