Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..292w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 292-299.
Astronomy and Astrophysics
Astrophysics
16
Radial Velocity, Semiregular Variable Stars, Stellar Radiation, Water Masers, Hydrogen, Microwave Emission, Thermal Emission
Scientific paper
High-resolution infrared (2-micron region) and optical spectra of semiregular variables found to show H2O masers were compiled. A comparison of the optical and 2-micron velocities with the maser velocities shows that the masers are emitted by a circumstellar envelope that is expanding at about 6/km from the photosphere. Since usually only the near-side masers are seen, the emitting gas must be located roughly within one stellar radius of the photosphere. The maser stars show much redder (2.2)-(11) colors than similar nonmaser stars confirming the close association of maser emission with the presence of a dusty envelope. It appears that the dust also forms within one stellar radius of the photosphere. New optical velocities of long-period variables, most of which are maser stars, are presented and discussed.
Dominy James F.
Wallerstein George
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