Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206l..17b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 1, Nov. 1988, p. L17-L19. Research supported by CAICYT.
Astronomy and Astrophysics
Astronomy
30
Carbon Monoxide, Late Stars, Microwave Spectra, Molecular Spectra, Variable Stars, Asymptotic Giant Branch Stars, Infrared Sources (Astronomy), Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Stellar Models
Scientific paper
The detection of CO J = 2-1 and J = 1-0 emission in two RV Tau variables, R Sct and AC Her, and upper limits in other two, U Mon and RV Tau is reported. The detected CO lines are relatively strong, implying the presence of thick envelopes and confirming the post-AGB nature of RV Tau stars. The envelope expansion velocities are low, 2.5-5 km/s. For the observed objects, the CO and far-IR intensities seem to be completely independent magnitudes. This surprising result is very difficult to explain, unless it is assumed that the CO molecules in the RV Tau envelopes are being efficiently photodissociated by the interstellar UV. From the necessary conditions for such a phenomenon, it is determined that a typical time of 2000-3000 years has elapsed from the quenching of the AGB mass-loss phase. The possible future evolution is briefly discussed.
Alcolea Javier
Bachiller Rafael
Bujarrabal Valentin
Martín-Pintado Jesús
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