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A complete survey of mm line emission from CO and 13CO in water fountain stars

Published online by Cambridge University Press:  30 August 2012

J. Ricardo Rizzo ,
José F. Gómez ,
Luis F. Miranda ,
Mayra Osorio  and
Olga Suárez
J. Ricardo Rizzo
Affiliation:
Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, Spain email: [email protected]
José F. Gómez
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain email: [email protected], [email protected]
Luis F. Miranda
Affiliation:
Departamento de Física Aplicada, Universidad de Vigo, Vigo, Spain email: [email protected]
Mayra Osorio
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain email: [email protected], [email protected]
Olga Suárez
Affiliation:
Laboratoire Fizeau, Université de Nice Sophia Antipolis, Nice, France email: [email protected]
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Abstract

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“Water fountains” (WF) are post-AGB stars characterized by very fast and often bipolar jets in the water maser line at 22 GHz. We conducted a survey of the CO and 13CO line emission using the IRAM 30m radio telescope of all the sources visible from the observatory. Over a total of 10 WFs observed, we identified CO and 13CO associated to IRAS 18460-0151 and IRAS 18596+0315. As the CO line emission is ubiquitous in the Galactic plane, the confirmed detections have met strict criteria to consider these cases as confirmed detections. The velocity components associated to the WFs are ~ 40 km s−1 wide, centered at the star velocity, present only at the star position, and detected in the four observed transitions, the CO and 13CO J=1→0 and 2→1 lines. A preliminary study, based on line ratios, indicates that this molecular component has a high opacity, and a very low 12C/13C isotopic ratio.

Keywords

circumstellar matterstars: evolutionISM: moleculesmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 484 - 485
Copyright
Copyright © International Astronomical Union 2012

References

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