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A study of the H2O maser emission from R Cas

Published online by Cambridge University Press:  03 August 2017

Jan Brand ,
Lara Baldacci  and
Dieter Engels
Jan Brand
Affiliation:
Istituto di Radioastronomia, CNR, Via Gobetti 101, I-40129 Bologna, Italy
Lara Baldacci
Affiliation:
Istituto di Radioastronomia, CNR, Via Gobetti 101, I-40129 Bologna, Italy Dip. to di Astron., Univ. Bologna, Via Ranzani 1, I-40127 Bologna, Italy
Dieter Engels
Affiliation:
Hamburger Sternwarte, Gojensbergweg 112, D-21029 Hamburg, Germany

Abstract

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Over the past decade we observed a sample of late-type stars (supergiants, semi-regular variables, OH/IR stars, and Mira's) 3-4 times per year in the 1.3-cm line of H2O. The observations were carried out with the Medicina 32-m and the Effelsberg 100-m telescopes. In addition, a sub-sample of these stars was observed at several epochs with the VLA. In our analysis we also use data from the literature, for instance on mass loss and optical variability. The aim is to investigate the properties of the circumstellar outflows and to elucidate the maser-pumping mechanism. In the conference poster we presented some preliminary results of a 4-star sub-set of the data base; in the small space available here, we briefly describe the monitoring program, and discuss the Mira-variable R Cas in some detail.

Type
Part 2. Stellar Masers
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 310 - 313
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

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