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Outburst in OH17.7-2.0

Published online by Cambridge University Press:  01 March 2007

M. Szymczak ,
E. Gérard  and
P. Wolak
M. Szymczak
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Poland email: smsz@astro.uni.torun.pl
E. Gérard
Affiliation:
GEPI, Observatoire de Paris, France email: Eric.Gerard@obspm.fr
P. Wolak
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Poland email: smsz@astro.uni.torun.pl
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Abstract

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We present OH 1612 MHz maser observations towards the pre-planetary nebula OH17.7–2.0 taken with the Nançay radio telescope in 2002–2007. A bursting feature at 73 kms−1 grew by a factor of 11 in 740 days in left-hand circular polarization intensity, reaching a maximum in mid-2005. The OH flux density of features at neighbouring velocities exhibited a rise by a factor of 5–7. During the burst, the degree of circular polarization increased from 7 to 83%. The blue-shifted emission showed weak variations of 7–10% in amplitude with the exception of the bluest feature for which the OH flux decreased with the rate of ~4.4 Jy year−1. Very unusual OH outbursts of individual features and remarkable changes in the shape of the maser profile appear to be linked with recent evolutionary changes in the detached shell.

Keywords

masersstars: flarestars: AGB and post-AGBstars: individual: OH17.7-2.0radio lines: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 346 - 347
Copyright
Copyright © International Astronomical Union 2008

References

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Szymczak, M. & Gérard, E. 2005, A&A 433, L29Google Scholar