Outburst in OH17.7-2.0 - Archive ouverte HAL
Communication Dans Un Congrès Année : 2007

Outburst in OH17.7-2.0

Résumé

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.

Dates et versions

hal-03743825 , version 1 (02-08-2022)

Identifiants

Citer

M. Szymczak, Éric Gérard, P. Wolak. Outburst in OH17.7-2.0. Astrophysical Masers and their Environments, IAU Symposium 242, Mar 2007, Alice Springs, Australia, Australia. pp.346-347, ⟨10.1017/S174392130701335X⟩. ⟨hal-03743825⟩
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