H I and CO in the circumstellar environment of the oxygen-rich AGB star RX Leporis
Abstract
Context: Circumstellar shells around AGB stars are built over long periods of time that may reach several million years. They may therefore be extended over large sizes ( 1 pc, possibly more), and different complementary tracers are needed to describe their global properties.
Aims: We set up a program to explore the properties of matter in the external parts of circumstellar shells around AGB stars and to relate them to those of the central sources (inner shells and stellar atmospheres).
Methods: In the present work, we combined 21-cm H I and CO rotational line data obtained on an oxygen-rich semi-regular variable,
Results: With the SEST, we detected the CO(2-1) rotational line from
Conclusions: A detached shell, similar to the one around
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 2008
- DOI:
- 10.1051/0004-6361:200810089
- arXiv:
- arXiv:0809.3265
- Bibcode:
- 2008A&A...491..789L
- Keywords:
-
- stars: individual: RX Lep;
- stars: mass-loss;
- stars: AGB and post-AGB;
- stars: winds;
- outflows;
- radio lines: stars;
- stars: circumstellar matter;
- Astrophysics
- E-Print:
- 15 pages, 9 figures, accepted for publication in A&