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Astron. Astrophys. 329, 219-228 (1998)

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Simultaneous observations of maser lines of 28SiO in evolved stars *

J.R. Pardo 1, 2, 3, J. Cernicharo 4, 2, E. González-Alfonso 5, 2 and V. Bujarrabal 2

1 DEMIRM/Observatoire de Paris-Meudon, 61 Avenue de l'Observatoire, F-75014 Paris, France
2 Observatorio Astronómico Nacional, Campus Universitario Apartado 1143, E-28800 Alcalá de Henares, Madrid, Spain
3 Present address: NASA-Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
4 CSIC, IEM, Dpto. Fsica Molecular, Serrano 123, E-28006 Madrid, Spain
5 Universidad de Alcalá de Henares, Departamento de Fsica, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain

Received 21 May 1997 / Accepted 7 August 1997

Abstract

We present simultaneous observations of several rotational lines of 28SiO in the v=1, 2, 3, and 4 vibrationally excited states toward O-rich evolved stars. All the data were taken in a relatively short period of 65 days, which allows a comparative study of the 28SiO maser lines intensities and profiles.

The observed differences concerning intensity and line shape among the different maser lines suggest that infrared overlaps deeply affect the pumping of some SiO masers. We qualitatively discuss this effect with consideration to the IR overlaps at 8 [FORMULA] m between the various SiO isotopomers and between 28SiO and water vapor.

Key words: stars: AGB, post-AGB – masers – stars: circumstellar matter – radio-lines: stars

* Tables 5 to 16 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.htlm.

Send offprint requests to: J.R. Pardo

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© European Southern Observatory (ESO) 1998

Online publication: November 24, 1997
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