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[vsnet-campaign-news 142] News from VSNET
*** News from VSNET ***
The new SU UMa star (J1131...) showed a period increase of superhumps.
SN 2002bj, having some peculiar features, experienced atypically
rapid fading.
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 March 18, 2002, as VSNET campaign circulation 1298
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V504 Cen (RA = 14h12m49s.36, Dec = -40d21'02".2)
As reported by R. Stubbings on March 12, the VY Scl-type star
V504 Cen is now in a faint state (<14.8mag), for the first time
in recent years (vsnet-campaign-nl 76).
SN 2002bq (RA = 09h30m50s.92, Dec = -35d42'06".0)
In IAUC 7848, L. A. G. Monard reported his discovery of an
apparent supernova (mag about 16.1) on CCD images taken on March
9. The host galaxy of SN 2002bq is a face-on spiral galaxy
MCG -06-21-010 = ESO 373-G005. The expected maximum for typical
SN Ia is mag about 14.9. It superimposed on a dense star region,
which suggest that it is possibly reddened (vsnet-campaign-sn 375).
SN 2002bm (RA = 12h30m16s.90, Dec = -08d23'34".8)
SN 2002bm was discovered by T. Puckett and A. Sehgal in an
image taken on March 6 at a magnitude of 17.0mag. MCG -01-32-19,
the host galaxy of SN 2002bm, is a face-on barred-spiral galaxy.
The expected maximum for typical SN Ia is mag about 16.1.
This SN turned out to be of type Ic (vsnet-campaign-sn 376).
SN 2002bn (RA = 11h32m39s.04, Dec = +52d56'54".2)
SN 2002bn was discovered by M. Armstrong in an image taken on
March 8 at a magnitude of 17.0. UGC 6527, the referred host of
SN 2002bn, is a name for the compact group of galaxies constructed
by three members. This group is a part of Arp 322 = HCG (Hickson)
56, which include 5 or more galaxies. The apparent host is
UGC 6527 NED03 = HCG 56B, a edge-on SB0 galaxy. The expected
maximum for typical SN Ia is mag about 16.8, which is not too far
from the observed value. This SN turned out to be a type Ia, four
weeks after maximum on Mar. 9.28 (vsnet-campaign-sn 377).
GZ Cnc (RA = 09h15m51s.70, Dec = +09d00'50".2)
As reported by P. A. Dubovsky on March 11, GZ Cnc = TmzV34
experienced a relatively rare outburst (13.3mag). The last
outburst was reported in 2000 December (vsnet-campaign-dn 2176).
The outburst was confirmed on March 12 (vsnet-campaign-dn 2178,
2184).
W Ori (RA = 05h05m23s.71, Dec = +01d10'39".0)
The star is exceptionally faint as reported to be 6.9-7.6mag
by some observers (vsnet-campaign-mira 21).
(continuous targets)
1RXP J113123+4322.5 (RA = 11h31m22s.426, Dec = +43d22'38".51)
The superoutburst continued until 17 when a sudden fading was
reported by M. Simonsen (vsnet-campaign-dn 2177, 2179, 2182, 2185).
M. Uemura reported the results of preliminary analysis of data
sets until March 11, which shows further increasing superhump
period. The gradual fading almost stopped on March 11
(vsnet-campaign-dn 2183).
SN 2002bo (RA = 10h18m06s.51, Dec = +21d49'41".7)
The CfA group notes about the narrow Na I D absorption at the
velocity of the host galaxy, which indicates the large reddening.
They also quote about the Ti absorption features, which suggest
that it may be a subluminous SN Ia (vsnet-campaign-sn 375).
The UCB group also observed this SN, but reports a lack of Ti
features. They comments on the strong Si II 585 nm feature, which
is also typical for subluminous SN Ia (vsnet-campaign-sn 377).
In an image taken by T. Hynek on March 10, this supernova did not
appear (vsnet-campaign-sn 378).
SAX J1805.5-2031 (RA = 18h05m34s, Dec = -20d30'.8)
M. Rupen reported that VLA 4.86 GHz observations on March 9
show no radio source to a limit of 5sigma (vsnet-campaign-xray 123).
Nova LMC 2002
(RA = 05h36m46s.4, Dec = -71d35'35".34)
The object is gradually fading (vsnet-campaign-nova 877, 878, 879).
SN 2002bj (RA = 05h11m46s.37, Dec = -15d08'10".7)
This supernova showed relatively rapid fading to 15.7mag as
reported on March 17 (vsnet-campaign-sn 380, 381).
GK Per (RA = 03h31m12s.50, Dec = +43d54'17".8)
The object continues gradual rising. The current magnitude
is about 11.5mag (vsnet-campaign-gkper 51, 56, 57, 58).
The strong modulations were still evident in the data on
March 11 taken by the Kyoto team. M. Uemura reported that
the phase of the peak of the long-term QPO shows no shift,
which indicates its coherence time is, at least, 4 days
(vsnet-campaign-gkper 55).
SN 2002ap (RA = 01h36m23s.85, Dec = +15d45'13".0)
The object is gradually fading (vsnet-campaign-sn2002ap 195, 196).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
A new outburst of 13.9mag was reported by R. Stubbings
on March 12 (vsnet-campaign-dn 2180).
V2540 Oph (RA = 17h37m34s.36 Dec = -16d23'18".4)
The object again began fading since March 10-11
(vsnet-campaign-nova 875).
V838 Mon (RA = 07h04m04s.816, Dec = -03d50'50".94)
The last brightening finished around March 11 and the object
is now gradually fading (vsnet-campaign-v838mon 275, 276, 277,
278, 279, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291).
C. Buil reported that the spectrum now become very complex with
the fading H-alpha emission (vsnet-campaign-v838mon 280).
V4740 Sgr (RA = 18h11m45s.82, Dec = -30d30'49".9)
B. Tregaskis reported a brightening of this nova since
March 4 (vsnet-campaign-nova 876). B. Skiff commented that the
color of V-Ic<0, which was reported by some observers and is quite
atypical for novae, is probably caused by color problems in
Tycho-1 catalogue (vsnet-campaign-nova 880, 881, 882).
UX Ori (RA = 05h04m30s.39, Dec = -03d47'18".3)
The object further fading (11.3mag on March 10 by E. Muyllaert)
(vsnet-campaign-orion 29).
AT Cnc (RA = 08h28m36s.92, Dec = +25d20'02".6)
A possible outburst of 13.4mag was reported by R. Stubbings
on March 12 (vsnet-campaign-dn 2181).
FS Aur (RA = 05h47m48s.34, Dec = +28d35'11".1)
A new outburst of 14.4mag was reported by P. A. Dubovsky on
March 11 (vsnet-campaign-dn 2175).
*** 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]
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 ***
GK Per
Information about comparison stars,
see [vsnet-campaign-gkper 52, 53, 54]
Time-series photometry provided by L. Kral,
see [vsnet-campaign-data 92]
V838 Mon
Spectrum taken by C. Buil:
http://vsnet.astrosurf.com/buil/us/nmon/nmon.htm
[vsnet-campaign-v838mon 280]
SN 2002bo
Images provided by T. Hynek and L. Kral:
http://vsnet.sin.cvut.cz/~lkral/ruzne/SN2002bo_n.jpg
[vsnet-campaign-sn 378]
Comparison stars, see [vsnet-campaign-sn 379]
J-band chart presented by K. Krisciunas:
http://vsnet.ctio.noao.edu/pub/nick/yalo/sn2002bo.jpg
[vsnet-campaign-sn 379]
(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