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[vsnet-campaign-news 151] News from VSNET
*** News from VSNET ***
The deeply eclipsing SU UMa-type dwarf nova IY UMa is now
in superoutburst.
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 May 13, 2002, as VSNET campaign circulation 1312
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
On May 7, a superoutburst of the deeply eclipsing SU UMa-type
dwarf nova IY UMa was detected (vsnet-campaign-dn 2362, 2364,
2366). The light curve taken by L. Cook on May 8 shows superhumps
with a complex structure. T. Kato noticed that the overall light
curve resembles that of DV UMa on the first night of the 1999
superoutburst (vsnet-campaign-dn 2379). Superhumps were observed
to increase in amplitude in the early May 11, when their amplitude
reached to 0.8mag (vsnet-campaign-dn 2390). During the very early
phase of the superoutburst, the period of superhump was relatively
short (0.07500 d), and then the superhump period increased.
The data on May 10-11 shows a superhump period of 0.07643 d
(vsnet-campaign-dn 2391, 2396). The VSNET collaboration team has
received CCD time-series observations which were kindly sent from
L. Cook, D. Starkey, J. Pietz, G. Masi, and the Nyrola team
(vsnet-campaign-dn 2398). The superoutburst is still ongoing
(vsnet-campaign-dn 2371, 2372, 2373, 2377, 2381, 2382, 2383, 2384,
2386, 2387, 2393, 2394).
SN 2002cs (RA = 18h46m59s.96, Dec = +45d42'19".7)
SN 2002cs was independently discovered on May 5 by the LOTOSS
team and by M. Armstrong. The object was 16.3mag (Armstrong) and
15.9mag (KAIT) at its discovery. It is located about 25" due east
of the nucleus of NGC 6702 (vsnet-campaign-sn 421). IAUC 7894
informed that the spectrum, taken by the Padova team, the CfA team,
and the Lick team on May 7, revealed that it is of type Ia near
maximum. They all noted that the expansion velocity is somewhat
larger than that for a normal one, which suggests that it can be
intrinsically brighter (vsnet-campaign-sn 424).
GP Com (RA = 13h05m42s.85, Dec = +18d01'02".6)
A possible outburst of this helium cataclysmic variable was
indicated on May 7 (14.9mag; vsnet-campaign 1310), but then
confirmed that it was not in a major outburst (vsnet-campaign
1311, vsnet-campaign-dn 2365, 2367, 2368, 2370, 2374, 2389, 2392).
EG Cnc (RA = 08h43m04s.04, Dec = +27d51'49".9)
According to AAVSO News Flash No. 962, a positive observation
of EG Cnc has been reported without a special comment
(vsnet-campaign-dn 2385), but the Kyoto team confirmed that it
was faint on May 12 (vsnet-campaign-dn 2397).
(continuous targets)
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
WZ Sge was reported to be still slightly brighter than its
quiescent level (vsnet-campaign-dn 2399).
SN 2002cr (RA = 14h06m37s.59, Dec = -05d26'21".9)
The object remains around the maximum (vsnet-campaign-sn 422).
UV Per (RA = 02h10m13s.58, Dec = +57d11'26".8)
The short outburst has faded (vsnet-campaign-dn 2380).
MKN 421 (RA = 11h04m27s, Dec = +38d12'32")
The object is now again in a bright state (vsnet-campaign-blazar
262).
V503 Cyg (RA = 20h27m15s.61, Dec = +43d41'45".5)
The superoutburst is still ongoing. T. Kato commented that
the well-known regular pattern of superoutbursts has been disturbed
since the end of 2001 (vsnet-campaign-dn 2400).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
It is still bright at about 14.0-14.1mag (vsnet-campaign-dn 2401).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
Recent observations have indicated that the object slightly
faded (vsnet-campaign-be 183).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
The faint state was terminated by an outburst (14.4mag)
occurred on May 7 (vsnet-campaign-dn 2361, 2369, 2378).
FG Sge (RA = 20h11m56s.14, Dec = +20d20'03".6)
The slow brightening continues. The object is now at about
13.4mag (vsnet-campaign-rcb 33).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
R. Stubbings reported that the object is undergoing a very
long outburst at a faint level (vsnet-campaign-v2051 11).
The Kyoto team performed CCD time-series photometry on May 12
and confirmed that it is still in outburst. The light curve
shows double humps, which resemble a combination of superhumps
and late superhumps (vsnet-campaign-v2051oph 13). The outburst
is still ongoing (vsnet-campaign-v2051oph 8, 9, 10, 13).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
An outburst of 15.5mag was reported on May 8 by P. A. Dubovsky
(vsnet-campaign-dn 2388). The next outburst was observed on
May 11 at 15.3mag by M. Reszelski (vsnet-campaign-dn 2395).
V838 Mon (RA = 07h04m04s.816, Dec = -03d50'50".94)
Observations by S. Kiyota shows that the object was Ic=7.72
on May 2 (vsnet-campaign-v838mon 366). A. Henden commented that
CCD observations with V- and Rc-filters are seriously affected
with the contribution from the nebula (vsnet-campaign-v838mon 367).
The object is still faint (vsnet-campaign-v838mon 368, 369).
V4334 Sgr (RA = 17h52m32s.70, Dec = -17d41'07".9)
An observation of 16.4C mag reported by D. West on May 9
implies that the object is possibly recovering (vsnet-campaign-rcb 32).
BL Lac (RA = 22h02m42s.86, Dec = +42d16'37".6)
The object was reported to be slightly brightening
(vsnet-campaign-blazar 261).
*** Future schedule ***
NEW X-RAY RESULTS FROM CLUSTERS OF GALAXIES AND BLACK HOLES
34th COSPAR Scientific Assembly
10th to 12th October 2002 - Houston, Texas
For more information, visit the session website:
www.mssl.ucl.ac.uk/www_astro/cospar
[vsnet-campaign-xray 124]
[vsnet-campaign-agn 2]
[vsnet-campaign-xray 133]
SUPERNOVAE (10 YEARS OF SN1993J)
22-26 April 2003, Valencia, Spain
Web site: http://vsnet.uv.es/2003supernovae/
[vsnet-campaign-sn 342]
34TH COSPAR - GRB AFTERGLOW PHYSICS
HOUSTON, TX, USA, 10-19 OCTOBER 2002
Main Scientific Organizer (MSO):
Elena Pian - INAF, Astronomical Observatory of Trieste, Italy -
pian@ts.astro.it
http://vsnet.ts.astro.it/topics/topix.html
[vsnet-campaign-grb 1]
MASS-LOSING PULSATING STARS AND THEIR CIRCUMSTELLAR MATTER
Sendai, Japan: May 13-16, 2002
contact to: Dr. M. Seki or wsloc@astr.tohoku.ac.jp
http://vsnet.astr.tohoku.ac.jp/ws2002/
[vsnet-campaign-mira 3]
International Conference on Classical Nova Explosions
Sitges (Barcelona), Spain: 20-24 May 2002
For more detailed information, see http://vsnet.ieec.fcr.es/novaconf
[vsnet-campaign-nova 643]
[vsnet-campaign-nova 666]
Blazar meeting at Tuorla: June 17-21, 2002
for more information, see http://vsnet.astro.utu.fi/blazar02
[vsnet-campaign-blazar 232]
*** General information ***
IY UMa
Eclipse ephemeris, see [vsnet-campaign-dn 2376, also see, 2363, 2375]
V2051 Oph
Eclipse ephemeris, see [vsnet-campaign-v2051oph 12]
VSNET-RECENT-SN archive
The archives can be reached from a VSNET top page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
, or directly:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-recent-sn/maillist.html
[vsnet-campaign-sn 423]
New list: vsnet-campaign-flare, see [vsnet-campaign-flare 1]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page