Circumstellar envelope structure of late-type stars

Details Circumstellar envelope structure of late-type stars Circumstellar envelope structure of late-type stars

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..733b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 733-754.

Astronomy and Astrophysics

Astrophysics

169

Interstellar Masers, Late Stars, Stellar Envelopes, Stellar Mass Ejection, Variable Stars, Astronomical Maps, Density Distribution, Interferometry, Mira Variables, Position (Location), Radial Velocity, Radii, Supergiant Stars

Scientific paper

The arcsecond structure of OH maser clouds surrounding 20 Mira variables and late-type supergiants has been measured using the VLA in a spectral line mode at 1612 MHz. Angular radii of the maser clouds range from <0arcsec.5 to 4arcsec and have been combined with phase lag measurements of the shell size to estimate distances for some of the stars. The outer radii range from 100 AU to 104AU, and the authors estimate a ratio of outer to inner radii ⪉4 for the maser regions. The previously discovered correlation between the mass loss rate and the outer radius of the maser region is confirmed and used to determine the mass loss rates for eight stars. The results of this work are compared with current theoretical models of circumstellar shells and the implications for mass loss mechanisms and the evolutionary fate of these stars are considered. It is suggested that the rare cases of nonspherical shells are indicating the presence of close binary companions.

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