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[vsnet-campaign-news 130] Rare, bright outburst of QZ Ser
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Rare, bright outburst of QZ Ser = HadV04
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Patrick Schmeer (Germany) reports the detection of the second historical
outburst of the dwarf nova QZ Ser = HadV04. The present outburst is the
brightest recorded outburst in the history. The object was originally
discovered by Katsumi Haseda (Aichi, Japan) as a possible dwarf nova.
No further bright outburst has been observed except Haseda's original
discovery photograph. This lack of outbursts have made exact classification
of the object difficult, and the true nature of the object is still
a mystery. QZ Ser may be a dwarf nova resembling WZ Sge, HV Vir, and
other similar objects with very rare outbursts.
Please try all with your efforts! The object is most likely an SU UMa
star in superoutburst, and must be superhumping! Please join the VSNET
Collaboration team in order to reveal the long-standing mystery of this
object! Try to take as many CCD exposures (exposure time 30s or so)
from the object's rise until dawn. Good luck with your observations!
Date: Mon, 4 Feb 2002 07:50:50 +0100
From: Patrick Schmeer <extpasc@rz.uni-sb.de>
Subject: [vsnet-alert 7156] QZ Ser very rare and bright outburst
Visual magnitude estimates by P. Schmeer, Bischmisheim, Germany:
QZ Ser = HadV04 (UG:)
Feb. 3.23 UT, [13.8 ; 4.228, 11.9 ; 4.237, 11.8
Sequence: GSC
Instrument: 203-mm SCT
QZ Ser in
USNO-A2.0: 155655.032 +210712.11 (2000.0) 15.1 16.3
GSC2.2: 155654.989 +210711.37 (2000.0) 15.54 16.41
This likely dwarf nova is undergoing a bright outburst - its first ever visually
observed one. Before today only one single (photographic) observation was made
of QZ Ser in its bright state (see [vsnet-obs 18349] below).
Time-resolved photometry of QZ Ser during this (possible super)outburst is very
urgently required.
Regards,
Patrick
P.S.:
SERQZ 20020203.23 <138 Scp
SERQZ 20020204.228 119 Scp
SERQZ 20020204.237 118 Scp
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* Date: Sat, 12 Dec 1998 15:20:07 +0900 (JST)
* To: samus@sai.msu.su, vsnet-obs
* From: Taichi Kato <tkato>
* Subject: [vsnet-obs 18349] New Haseda variable (HadV04)
* Cc: vsolj-obs@ooruri.kusastro.kyoto-u.ac.jp
* Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
New Haseda variable (HadV04)
Katsumi Haseda (Aichi, Japan) reports the discovery of a new variable
star (HadV04).
HadV04
= USNO1050.07813998 155655.060 +210712.20 (2000.0) 15.3 16.8
Photographic magnitude estimates by VSOLJ members
object YYMMDD(UT) mag code
HadV04 980105.826 <148p Had.VSOLJ
HadV04 980303.809 148p Had.VSOLJ
HadV04 980328.753 <142p Had.VSOLJ
HadV04 980504.708 <145p Had.VSOLJ
HadV04 980617.547 127p Had.VSOLJ
This object may be identical with the following ROSAT WGA source.
155656.6 +210818 (2000.0) 1WGAJ1556.9+2108 0.0254 2.43 0.70 1.82 0.56
obs=1992.032
The object was invisible on 15 exposures by Takamizawa. The small fraction
of bright states, the apparent lack of variablility between three DSS exposures
at different epochs (research by H. Yamaoka) may suggest the dwarf nova nature.
Further monitoring of the object is strongly encouraged.
object YYMMDD(UT) mag code
HadV04 940505.643 <149p Tmz.VSOLJ
HadV04 940627.510 <149p Tmz.VSOLJ
HadV04 940925.446 <147p Tmz.VSOLJ
HadV04 950101.835 <149p Tmz.VSOLJ
HadV04 950110.774 <149p Tmz.VSOLJ
HadV04 950423.615 <149p Tmz.VSOLJ
HadV04 951217.824 <145p Tmz.VSOLJ
HadV04 951227.823 <149p Tmz.VSOLJ
HadV04 970509.588 <149p Tmz.VSOLJ
HadV04 970704.544 <149p Tmz.VSOLJ
HadV04 970824.502 <149p Tmz.VSOLJ
HadV04 971020.423 <140p Tmz.VSOLJ
HadV04 980419.616 <149p Tmz.VSOLJ
HadV04 980912.461 <145p Tmz.VSOLJ
HadV04 981010.407 <149p Tmz.VSOLJ
Observer's code:
Had: K. Haseda (Aichi, Japan)
Instruments: 10cm F4.0 twin patrol camera +T-Max400(120)
Tmz: K.Takamizawa (Saku-machi,Nagano,Japan)
Inst.: 10cmR F4 twin patrol cameras T-Max400 120
Comparison stars mag.:GSC
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Regards,
Taichi Kato
On behalf of the VSNET Collaboration team
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VSNET (Variable Star Network) is an international variable star observing
network, covering various areas of novae, supernovae, cataclysmic variables
(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables. VSNET is one of invited contributing organizations
to the SkyPub AstroAlert system.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night. The only requirements are
the weather and your patience! If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.
We would sincerely appreciate volunteers who would join the VSNET
Collaboration team to study the wonders of these exotic variable stars.
To join the VSNET campaign collaborative list, send an e-mail to
vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator)
with a line "SUBSCRIBE vsnet-campaign." or your comment to join the
collaboration team.
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