Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21841013w&link_type=abstract
American Astronomical Society, AAS Meeting #218, #410.13; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Over the past few decades, the symbiotic binary CH Cyg, in which a white dwarf accretes from the wind of a red giant companion star, has produced several spacially resolvable jets in radio, X-ray, and optical. Often, this jet production has been associated with changes in the optical brightness. This change may be caused by changes in the state of the accretion disk, as with accretion for young stellar objects or X-ray binaries, and could be evidence for a larger connection between the state of the accretion disk and the presence of a jet. After a major optical decline in late 2006, we carried out a series of VLA multi-band observations for over a year. We obtained multiple images of a developing jet with a large component to the southwest of the unresolved central binary, and tracked the changes in flux density and spectral index. The flux density rose between March and July of 2007, after which there was a steady decline lasting at least until August 2008. While the spectral index remained fairly constant during this period, the jet spectrum rose with frequency and flattened at higher frequencies, and there is some indication that the plasma may be close to optically thin. The timing of the increases in the flux density suggests a connection between the jet event and the optical decline. We discuss the implications of our results regarding the nature of the jet ejection, the velocity of its expansion, and possible constraints for the amount of mass ejected.
Sokoloski Jeno
Weston Jennifer
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