Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..536b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 536-548. Research supported by CICYT.
Astronomy and Astrophysics
Astrophysics
40
Electron Transitions, Radio Spectra, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Variable Stars, Carbon Isotopes, Carbon Monoxide, Line Spectra, Millimeter Waves, Silicon Isotopes, Silicon Oxides
Scientific paper
Observations are presented of envelopes around 10 evolved stars in the molecular transitions (C-12)O J = 2-1 and J = 1-0, (C-13)O J = 2-1 and J = 1-0, (Si-28)O J = 3-2, and (Si-29)O J = 3-2. Maps in these transitions, mainly for (C-12)O and (Si-28)O, are presented. In none of the studied envelopes is the SiO line emission clearly resolved. The envelope shape is nearly circular in all the cases, except for the carbon-rich star V Cyg, which presents an elongated envelope. Accurate profiles in R Cas and Chi Cyg suggest the existence of several independent winds. The presence of secondary peaks in several spectra is interpreted as being due to the existence of condensations in the inner regions of the envelope. It is inferred from the expected (Si-28)O/(Si-29)O isotopic abundance ratio and the J = 3-2 line ratio that the (Si-28)O J - 3-2 opacity must be larger than about 4 in the present envelopes.
Alcolea Javier
Bujarrabal Valentin
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