Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..359z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 359-364. Research supported by the Matsumae Interna
Astronomy and Astrophysics
Astrophysics
11
Interstellar Masers, Mathematical Models, Silicon Oxides, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Geometry, Radial Velocity, Stellar Models
Scientific paper
A new geometrical model of VY CMa is proposed to explain the three-peaked spectra of transitions υ = 1,2 J = 1-0 of SiO maser emission. In this model the circumstellar envelope of VY CMa is a rotating disk of gas and dust seen nearly edge-on. The disk consists of two regions: a decelerated steady stream near the photosphere of the star and an accelerated one further away. Other geometries are discussed and eliminated. Calculated profiles of SiO maser lines fit well the observations. It is possible to explain the three-peaked profiles of SiO maser lines emitted by NML Cyg, RR Aql, NML Tau, etc.
Kaifu Norio
Zhou Zhen-Pu
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