2005A&A...433L..29S


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST04:54:39

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.

SZYMCZAK M. and GERARD E.

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

Status at CDS:  

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 692 1
2 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1159 0
3 2C 553 QSO 06 27 10.1 -05 53 06           ~ 148 1
4 OH 17.7 -2.0 pA* 18 30 30.703 -14 28 57.04           ~ 132 1
5 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 450 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-04:54:39

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