Outburst in OH17.7-2.0

Details Outburst in OH17.7-2.0 Outburst in OH17.7-2.0

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..242..346s&link_type=abstract

Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p.

Astronomy and Astrophysics

Astrophysics

Masers, Stars: Flare, Stars: Agb And Post-Agb, Stars: Individual: Oh17.7-2.0, Radio Lines: Stars

Scientific paper

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.

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