[vsnet-chat 7310] (ATEL) jets in Z And

[Taichi Kato]

   Just for your interest.  High-speed jets in symbiotic stars
have been recorded, notably, in V694 Mon (MWC 560) and CH Cyg.
The best studied these "jet sources" are known to exhibit
short-term variations (sometimes quasiperiodic).  Time-resolved
photometry of Z And during the current outburst might provide
insight into the structure of the outbursting accretion disk,
although the observed velocity in Z And is much smaller than
those in the prototypical two objects.

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The Astronomer's Telegram                   http://www.astronomerstelegram.org 
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Posted: Sat Sep  9 01:30:01 EDT 2006 -- Fri Sep 15 01:30:01 EDT 2006
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ATEL #882                                                            ATEL #882

Title:          The first detection of the bipolar jets from the symbiotic
                prototype Z And
Author: A. Skopal, T. Pribulla (Astronomical Institute of the Slovak
                Academy of Sciences, Tatranska Lomnica)
Queries:        skopal at ta3.sk
Posted: 14 Sep 2006;  13:56  UT
Subjects:       Optical, Binaries, Cataclysmic Variables

We report on the current major outburst of the symbiotic prototype   Z
And and the discovery of spectral signatures of collimated bipolar   jets
observed at/after its optical maximum.   

Our UBVRc photometry taken at the Observatories of the Astronomical
Institute of the Slovak Academy of Sciences showed a gradual increase
in the star's brightness from 2006 April 07 (9.86, 10.94, 10.29   and
9.27) to 2006 July 19, when Z And peaked at 8.06, 8.94, 8.58   and 8.10
in the U, B, V and Rc passband, respectively. This was   the highest maximum
that has ever been recorded by the multicolor   photometry (from 1983)
to date.   

On 2006 August 30.19 UT we obtained high-resolution spectra of Z And
(R = 11000) at the David Dunlop Observatory, University of Toronto, 
with 1.88-m telescope in the ranges of 6430-6700A and 4620-4915A.   The
hydrogen H-alpha and H-beta lines showed a strong central emission   component
located around the reference wavelengths, which were   accompanied by weaker
satellite emission components at -1260(11) and   +1210(11) km/s in both
the lines. Integrated fluxes of these jet   emissions were 5.4(0.6) and
2.3(0.5) x 1.0E-12 erg sE-1 cmE-2 in   H-alpha and H-beta, respectively.
FWHM of the violet jet's emission   was 183(10) km/s and that of the red
one was 204(10) km/s.   In addition, a strong absorption component in the
H-beta and HeI 4713A   profiles was measured at about -150 and -90 km/s,
respectively.   Radial velocities are heliocentric. Signatures of the bipolar
jets   in the Z And optical spectrum were the first ever recorded for this
system.  

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Password Certification:  Augustin Skopal (skopal at ta3.sk)
http://www.astronomerstelegram.org/?read=882