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Astron. Astrophys. Suppl. Ser. 130, 1-64

A 12CO($J=1\rightarrow 0$) and ($J=2\rightarrow 1$) atlas of circumstellar envelopes of AGB and post-AGB stars

R. Neri1, C. Kahane2, R. Lucas1, V. Bujarrabal3, and C. Loup4

Send offprint request: R. Neri

1 - IRAM, 300 rue de la Piscine, 38406 S$^{\rm t}$ Martin d'Hères, France
2 - Observatoire de Grenoble, BP. 53, 38041 Grenoble Cedex 9, France
3 - Observatorio Astronómico Nacional (I.G.N), Apartado 1143, 28800 Alcalá de Henares, Madrid, Spain
4 - Institut d'Astrophysique de Paris, CNRS, 98 bis Bd. Arago, 75014 Paris, France

Received June 30; accepted October 28, 1997


We present the results of a 12CO($J=1\rightarrow 0$) and ($J=2\rightarrow 1$) survey on a sample of 46 objects classified as AGB and post-AGB stars. We have obtained fully sampled high resolution maps of their 12CO($J=1\rightarrow 0$) 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 12CO($J=2\rightarrow 1$) maps observed at the IRAM 30 m telescope. From the 12CO($J=1\rightarrow 0$) 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 ($J=1\rightarrow 0$) emission.

Key words: Atlases -- stars: AGB, post-AGB -- stars: circumstellar matter -- stars: mass-loss -- stars: evolution -- radio lines: stars

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