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[vsnet-campaign-news 32] News from VSNET 32
*** News from VSNET ***
TV Col experienced a relatively rare and very rapidly declining
outburst. Because of its short duration, it is difficult to study
the outburst nature.
For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.
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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.
The "News from VSNET", mainly focusing on recent remarkable activities of
CVs and related systems, is issued on a weekly basis, except on occasions
of extremely urgent or transient events.
Please refer to the VSNET Home Page for more details of events and
objects listed.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
VSNET provides a number of mailing lists, on which various news and topics
are discussed. Subscriptions to the VSNET mailing lists are free of charge;
please refer to the instruction on the above page if a reader needs more
information of the list structure.
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."
(VSNET campaign members are strongly recommended to subscribe to vsnet-alert
at the same time).
Regards,
Taichi Kato
On behalf of the VSNET administrator team
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The following was issued on Dec. 12, 2000, as VSNET campaign circulation 581.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2000fb (RA = 05h57m41s.95, Dec = -51d57'48".0)
According to IAUC 7536, R. Chassagne discovered a supernova (mag 15.8)
on November 29 (vsnet-campaign-sn 123). H. Yamaoka wrote in
[vsnet-campaign-sn 124] that the offset from the nucleus of the host
barred-spiral galaxy ESO 205-G11 is about 5" east and 25" north
(because of the poor cataloged position of the galaxy, the offset reported
on IAUC is somewhat erroneous). According to the NED, the recession
velocity of the host galaxy is 8600 km/s, from which the expected maximum
of normal SN Ia is about mag 17.
TV Col (RA = 05h29m25s.5, Dec = -32d49'05".2)
As reported by R. Stubbings (vsnet-alert 5419) and B. Monard
(vsnet-alert 5420) on December 5, the intermediate polar TV Col experienced
an outburst (or in bright state). The last reported brightening was
observed on 2000 Apr. 25 (reaching mv=12.1; vsnet-alert 4677, 4746), which
experienced very rapid fading (vsnet-campaign 572; vsnet-campaign-ip 10).
A rapid fading from the outburst was reported on December 6 (13.9mag by
R. Stubbings)(vsnet-campaign-ip 12, 14). K. Mukai and his collaborators
observed TV Col with RXTE on Dec 7 (vsnet-campaign-ip 13).
A. Retter announced TV Col campaign on 2001 January 2-15
(vsnet-campaign-ip 15, vsnet-campaign 579). It returned quiescence now
(~14mag; vsnet-campaign-ip 16).
VZ Pyx (RA = 08h59m20s.0, Dec = -24d28'56".1)
The outburst of VZ Pyx, which was detected by R. Stubbings on December 1,
reached a supermaximum on December 5 (vsnet-campaign 573).
The superoutburst is still continues, and the current magnitude is
about 11.9 (vsnet-campaign-dn 292, 301).
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
P. Dubovsky reported an outburst of IY UMa at 14.6mag on December 7
(vsnet-campaign 576, vsnet-campaign-dn 291). M. Uemura and Kyoto team
confirmed the outburst on December 8 (vsnet-campaign 578).
The observation yields four eclipses and no humps. The depth of eclipse
was about 2.5mag (vsnet-campaign-dn 296). He also reported the mean
magnitude on December 7.75 was Rc=14.7 (vsnet-campaign-dn 297) and
on December 8.71 was Rc=15.6, which indicates this outburst seems to be
a normal one (vsnet-campaign-dn 298).
RX J1155.4-5641 (RA = 11h55m27s.03, Dec = -56d41'53".3)
As reported by R. Stubbings on December 9, the ROSAT-selected dwarf
nova RX J1155.4-5641 is undergoing an outburst(12.0mag). The last outburst
was observed in 2000 July (vsnet-campaign 580).
SN 2000fe (RA = 09h14m55s.15, Dec = +46d54'02".0)
IAUC 7540 informed SN 2000fe was discovered by the collaboration team
of M. Schwaltz and the KAIT and it can evolve to mag 15 order.
The location is about 5" west and 10" south of the nucleus of the spiral
galaxy UGC 4870. UGC 4870 had produced another SN 1966A, which was
discovered at pg = 15.5 after maximum. The recession velocity of the host
galaxy is 4218 km/s, from which the expected maximum of the normal SN Ia
is about mag 15.5 (vsnet-campaign-sn 125).
(continuous targets)
BF Eri (RA = 04h39m29s.62, Dec = -04d36'10".0)
R. Ishioka and Kyoto team reported the detection of short-term
modulations which seem to have a periodicity of about three hours
from their observation on November 29 - December 4 (vsnet-campaign-dn 281).
R. Ishioka and Kyoto team reported the magnitude of 14.4 on December 5
(vsnet-campaign-dn 283). The observations by R. Stubbings on December
4 and 5 showed that the fading from the outburst may be stopped at 14.2mag
(vsnet-campaign-dn 288).
CT Hya (RA = 08h51m04s.50, Dec = +03d07'43".5)
S. Kiyota has reported his time-series photometry on December 1,2,4,5
(vsnet-campaign-data 47, 48, 49, 50).
V503 Cyg (RA = 20h27m15s.61, Dec = +43d41'45".5)
C. Kunjaya provided a light curve observed at Gunma
(vsnet-campaign-dn 282). M. Uemura and Kyoto team reported that
the observation on December 7 shows rapidly fading from the superoutburst,
and a possible short-term variation (vsnet-campaign-dn 295).
V591 Cen (RA = 12h42m18s.56, Dec = -33d33'44".2)
R. Stubbings reported the fading (<14.6mag )from the outburst on
December 5 (vsnet-campaign-dn 287).
TY PsA (RA = 22h49m40s.31, Dec = -27d06'54".3)
The superoutburst is still ongoing. The current magnitude is around
12.0 (vsnet-campaign-dn 284, 293, 300).
SN 2000ez (RA = 11h57m45s.75, Dec = +32d17'49".1)
IAUC 7535 tells that SN 2000ez is of type II (vsnet-campaign-sn 123).
SN 2000fa (RA = 07h15m29s.88, Dec = +23d25'42".4)
IAUC 7535 tells that SN 2000fa is of type Ia before maximum. It
can reach mag 16 in these days (vsnet-campaign-sn 123).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
R. Stubbings reported it was brightening again on December 5
(vsnet-campaign-dn 289).
OY Car (RA = 10h06m22s.46, Dec = -70d14'04".4)
The superoutburst is still ongoing. The current magnitude is around
12.9 (vsnet-campaign-dn 285, 290, 294, 299, 302).
BL Lac (RA = 22h02m42.86s, Dec = +42d16'37.6")
The striking activity is still observed. During the last week,
13.9-14.6mag were reported (vsnet-campaign-blazar 106, 108, 110).
PKS 2005-489 (RA = 20h05m47.4s, -48d58'45".0)
The bright state continues (~12.2mag; vsnet-campaign-blazar 107).
*** Future schedule ***
TV Col campaign conducted by A. Retter (2001 January 2 - 15):
"Recently using previously published data, we discovered evidence for
another periodicity in the light curve of TV Col. The 6.4-h period would
be the longest recorded positive superhump. To confirm this period, I'll
carry out continuous photometry on TV Col during two weeks in January
(2-15) using the 0.75-m reflector with the UCT CCD in Sutherland, South
Africa.
I am calling for a campaign on TV Col during these nights. As the
candidate periodicity is relatively long, multi-longitude continuous
monitoring of the object is extremely important to reduce the aliasing
problem. So, if you can observe the object for at least ~4 h (preferably
more than one 6.4-h cycle), please let me know."
for more information, see [vsnet-campaign 579],[vsnet-campaign-ip 15]
*** General information ***
V503 Cyg
Light curve provided by C. Kunjaya:
http://vsnet.astron.pref.gunma.jp/data/001129V503Cyg.html
TV Col
Eclipse ephemeris, see [vsnet-campaign-ip 11]
IY UMa
Eclipse ephemeris, see [vsnet-campaign 577]
MAXI workshop on AGN Variability (Second Circular),
see [vsnet-campaign-blazar 109]
(This summary is reproduction free.)
Regards,
Makoto Uemura
vsnet-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page