Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l.199h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 15, 1979, p. L199-L204.
Astronomy and Astrophysics
Astrophysics
34
Interstellar Masers, Variable Stars, Light Curve, Mira Variables, Silicon Oxides
Scientific paper
The paper reports observations of 86 GHz SiO (upsilon = 1, J = 2-1) maser emission from the Mira variables R Leo and Omicron Ceti and from Orion A, performed between 1977 December and 1979 June. The SiO fluxes from R Leo and Omicron Ceti appear to be correlated with their near-infrared intensities, having a distinct phase lag with respect to the visual light curve. An irregular behavior of the R Leo maser, at a time when the star approached an unusually bright maximum, is probably a manifestation of the extreme sensitivity of the maser process to any disturbances. The total integrated flux of the Orion A SiO maser is relatively stable, but there are considerable relative intensity variations between the two main components, and weak emission appears to be present in the entire interval between the latter features.
Hjalmarson Å..
Olofsson Hans
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