SIMBAD references

2005A&A...433L..29S - Astronomy and Astrophysics, volume 433, L29-32 (2005/4-2)

Burst of strongly polarized maser emission at 1612MHz in the proto-planetary nebula OH17.7-2.0.


Abstract (from CDS):

We report the discovery of a burst of highly polarized OH maser emission at 1612MHz in the proto-planetary nebula candidate OH17.7-2.0. The total flux density of two red-shifted features at 72.8 and 73.3km/s increased nearly threefold over a period of ∼430days. This burst was not associated with any systematic changes of the other 1612MHz maser features as well as of the 1665 and 1667MHz masers. The burst was characterized by a linear growth of left-hand circularly polarized emission accompanied by considerable linearly polarized emission. During the burst, the degrees of circular and linear polarization increased up to -80% and 15% respectively. A relation found between the line width and the peak flux density of the two bursting features implies a saturated amplification. Among several possible causes of the burst, a local propagation effect due to Zeeman overlap initiated by evolutionary changes in the shell appears most plausible.

Abstract Copyright:

Journal keyword(s): polarization - masers - stars: AGB and post-AGB - circumstellar matter - stars: individual: OH17.7-2.0 - radio lines: stars

Simbad objects: 5

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