Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..130....1n&link_type=abstract
Astronomy and Astrophysics Supplement, v.130, p.1-64
Astronomy and Astrophysics
Astrophysics
100
Atlases, Stars: Agb, Post-Agb, Stars: Circumstellar Matter, Stars: Mass-Loss, Stars: Evolution, Radio Lines: Stars
Scientific paper
We present the results of a (12) CO (J=1-> 0) and (J=2-> 1) survey on a sample of 46 objects classified as AGB and post-AGB stars. We have obtained fully sampled high resolution maps of their (12) CO (J=1-> 0) emission by combining visibilities from the IRAM interferometer with short spacing observations from the IRAM 30 m telescope. Properties of their circumstellar envelopes like fluxes, radii, and positions are derived from model fits to the visibilities and compared to the results obtained from (12) CO (J=2-> 1) maps observed at the IRAM 30 m telescope. From the (12) CO (J=1-> 0) observations we have derived mass loss rates for 38 stars and established an empirical relation between the CO photodissociation radius of an envelope and the measured radius in the (J=1-> 0) emission.
Bujarrabal Valentin
Kahane Claudine
Loup Caroline
Lucas Robert
Neri Roberto.
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