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[vsnet-campaign-news 148] News from VSNET
*** News from VSNET ***
V838 Mon suddenly faded to 12th mag. T. Vanmunster discovered
irregular, large-amplitude modulations in the new novalike variable
RX J1643.7+3402.
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 April 29, 2002, as VSNET campaign circulation 1306
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2002cj (RA = 15h21m20s.71, Dec = -19d51'27".3)
The LOTOSS team discovered SN 2002cj on images taken on April 21
(mag about 16.0) and 22 (mag about 15.9). ESO 582-G005, the host
galaxy of SN 2002cj, is a moderate-distant galaxy. The expected
maximum for typical SN Ia is mag about 16.8. The reported magnitude
is somewhat brighter than the expected one (vsnet-campaign-sn 416).
(continuous targets)
V4741 Sgr = Nova Sgr 2002
(RA = 17h59m59s.38, Dec = -30d53'21".9)
This nova has been given the permanent designation V4741 Sgr
(IAUC 7882; vsnet-campaign-nova 928). T. Kato reported the
object was reported to be fading rapidly (t2 ~ 9d)
(vsnet-campaign-nova 929).
RX J1643.7+3402 (RA = 16h43m45s.1, Dec = +34d02'35")
T. Vanmunster performed time-series observations and reported
0.2-0.3mag modulations with irregular periods of 10-15 min.
He also reported that there's a superimposed, much longer term
modulation, likely related (or identical) to the photometric
modulation originally reported by Michaelian (vsnet-campaign 1304,
1305).
DV UMa (RA = 09h46m36s.67, Dec = +44d46'45".1)
A. Oksanen reported that the object was 15.50mag on April 22
and the light curve was rather flatter (vsnet-campaign-dn 2333).
MKN 421 (RA = 11h04m27s, Dec = +38d12'32")
The fading continues. It was reported to be 12.9-13.2mag
during the last week (vsnet-campaign-blazar 259).
DY Per (RA = 02h35m17s.12, Dec = +56d08'44".7)
A. Alksnis reports that the object is further fading.
The fading rate is 0.04mag/d in red light and 0.025mag/d in
blue. The object was reported to be 11.0mag (red) and 14.6mag
(blue) on April 22 (vsnet-campaign-rcb 25). The slow fading
still continues (vsnet-campaign-rcb 26).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
The sudden fading was reported on April 18 and confirmed at
16.3mag on April 20 (vsnet-campaign-dn 2334).
V893 Sco (RA = 16h14m45s.26, Dec = -28d39'30".3)
The object was reported to be brightening on April 23
(vsnet-campaign-dn 2336).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
The object faded from the superoutburst as reported by
R. Stubbings on April 25 (vsnet-campaign-v2051oph 3, 4).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
A bright outburst (14.7mag) was detected by M. Reszelski
on April 22 (vsnet-campaign-dn 2335).
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
A. Oksanen reported that the object was still calm at 17.5mag
on April 21 (vsnet-campaign-dn 2332).
V838 Mon (RA = 07h04m04s.816, Dec = -03d50'50".94)
When the object was about 10.3-10.5mag, the gradual fading was
interrupted by a sudden, dramatic fading to 12.4mag on April 27
(vsnet-campaign-v838mon 345, 347). The rapid fading was confirmed
on April 27 and 28, and it is still in fading
(vsnet-campaign-v838mon 348).
*** 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 ***
V2051 Oph
Eclipse ephemeris, see [vsnet-campaign-v2051oph 5]
DV UMa
Eclipse ephemeris, see [vsnet-campaign-dn 2337]
(This summary can be cited.)
Regards,
Makoto Uemura
vsnet-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page