Strong asymmetries in the neutral envelope of Mira observations. CO and K I

Details Strong asymmetries in the neutral envelope of Mira observations. CO and K I Strong asymmetries in the neutral envelope of Mira observations. CO and K I

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...362..255j&link_type=abstract

Astronomy and Astrophysics, v.362, p.255-262 (2000)

Astronomy and Astrophysics

Astrophysics

33

Stars: Agb And Post-Agb, Stars: Circumstellar Matter, Stars: Individual: O Ceti

Scientific paper

We present high-resolution observations of the neutral envelope of o Ceti. The molecular component has been mapped in the CO(2-1) radio line and the atomic component is studied through long-slit spectroscopy of the optical Ki line. These observations reveal strong asymmetries in the gas distribution, which can be interpreted as a spherical envelope disrupted by a bipolar outflow. These data, combined with other observations of this object as well as similar observations of other AGB stars, suggest that asymmetrical mass loss processes occur early during the AGB stage, well before the proto-planetary nebula phase. Based on observations carried out with the IRAM Plateau de Bure Interferometer, the Canada-France-Hawaii Telescope, and at the Haute-Provence Observatory. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).

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