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OH masers in semiregular variables: Insights from long-term monitoring

Published online by Cambridge University Press:  03 August 2017

Leszek Błaszkiewicz
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, PL-87100 Toruń, Poland
Marian Szymczak
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, PL-87100 Toruń, Poland
Sandra Etoka
Affiliation:
University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, UK
A.M. Le Squeren
Affiliation:
GRAAL, Université de Montpellier II, F-34095 Montpellier Cedex, France

Abstract

Drifts in radial velocities of OH maser features of the three semiregular variable stars R Crt, RT Vir and W Hya have been analyzed. The radial velocities of the extreme blue- and red-shifted features drifted by about 0.2 kms−1 to 1 km s−1 on time-scales of few months to several years. In the case of W Hya a blending effect of spectral features can account for those drifts. In the two other sources the velocity drifts are likely to be intrinsic to the clumps for which the velocities of peak emission vary due to appearance or disappearance of maser emission in the regions where circumstellar matter is still accelerated.

Type
Part 2. Stellar Masers
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Etoka, S., Blaszkiewicz, L., Szymczak, M., & Le Squeren, A. M. 2001, A&A, (submitted) Google Scholar
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Szymczak, M., Cohen, R. J., & Richards, A. M. S. 1999, MNRAS, 304, 877 CrossRefGoogle Scholar
Szymczak, M., Le Squeren, A. M., Sivagnanam, P., Tran Minh, F., & Fournier, A. 1995, A&A, 297, 494 Google Scholar
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