Physical conditions near red giant and supergiant stars - an interpretation of SiO VLBI maps

Details Physical conditions near red giant and supergiant stars - an interpretation of SiO VLBI maps Physical conditions near red giant and supergiant stars - an interpretation of SiO VLBI maps

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..838a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 838-841.

Astronomy and Astrophysics

Astrophysics

39

Red Giant Stars, Silicon Oxides, Stellar Envelopes, Supergiant Stars, Very Long Base Interferometry, Gas Density, Masers, Population Inversion, Radiative Transfer

Scientific paper

Understanding the dynamical structure of circumstellar envelopes around cool giant and supergiant stars depends critically on the knowledge of what happens in the 'near zone' of the envelope, within a few stellar radii of the star. One probe with adequate angular resolution to study the near zone is VLBI observation of the SiO masers. It is shown that VLBI maps of VX Sgr establish that the particle density in the SiO masers is very high (about 10 to the 12th/cu cm), indicating that the masers form in dense cloudlets and not in a spherically expanding wind. The implications of these results for the mechanism of mass loss are discussed.

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