Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..499a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. 499-512. CICYT-supported research.
Astronomy and Astrophysics
Astrophysics
57
Late Stars, Radio Stars, Stellar Evolution, Molecular Spectra, Stellar Envelopes, Stellar Mass Ejection, Taurus Constellation
Scientific paper
New molecular observations of RV Tauri variables and of the related object 89 Her are presented, and the already existing data are re-examined. The molecular emission of these objects is analyzed using numerical models for excitation and line formation. The infrared emission of these stars and some low-mass protoplanetary nebulae (PPNe) is also studied. It is deduced that the envelopes around RV Tau stars were formed by mass loss processes at rates of 4 x 10 to the -7th to 7 x 10 to the -6th solar mass/yr. Several low-luminosity PPNe that are probably issued from objects similar to the RV tauri stars were identified. Several observable parameters varying during the postasymptotic-giant-branch (AGB) evolution of low-mass objects are determined. It is found that, during this segment of the stellar evolution, phases of negligible mass loss alternate with others in which mass loss is very important (up to 6 x 10 to the -7th solar mass/yr). It is suggested that these protoplanetary mass loss processes are directly related to the evolution itself.
Alcolea Javier
Bujarrabal Valentin
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