[vsnet-campaign-symbio 123] (ATEL) jets in Z And
Taichi Kato
tkato at kusastro.kyoto-u.ac.jp
Mon Sep 18 13:48:12 JST 2006
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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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
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