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*** News from VSNET ***
VW CrB 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 July 28, 2003, as VSNET campaign
circulation 1406
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
EZ Del (RA = 20h25m22s.5, Dec = +15d46'01")
R. Stubbings reported an outburst of the dwarf nova EZ Del with
14.8mag on July 21. The object has been infrequently seen in
outburst in the past VSNET record (once per year or less). Among
them, the outbursts in 1997 August and 1999 October were long
outbursts. The object in outburst is thus a good candidate for CCD
time-resolved photometry (vsnet-campaign-dn 3874). The object is
now fading from the outburst (vsnet-campaign-dn 3875).
PKS 2155-304 (RA = 21h58m52s, Dec = -30d13'31")
P. Williams reported that the BL Lac object, PKS2155-304 is now
fainter. It was 12.9mag on 2002 November, and 13.7mag on 2003 July
(vsnet-campaign-blazar 304).
SN 2003gn (RA = 22h33m51s.68, Dec = +20d48'08".5)
SN 2003gn is hosted by an apparent spiral galaxy CGCG 452-024.
The expected maximum for typical SN Ia is mag about 17.5
(vsnet-campaign-sn 659).
SN 2003go (RA = 19h52m47s.68, Dec = -19d11'28".2)
SN 2003go is hosted by 2MASX J19524734-1911281, a spiral galaxy
which makes a pair with ESO 595-G001. If the distance of the host
galaxy is same as that of ESO 595-G001, the expected maximum of
typical SN Ia is mag about 17.9 (vsnet-campaign-sn 659).
VW CrB (RA = 16h00m03s.76, Dec = +33d11'14".4)
The object is now in a superoutburst (vsnet-campaign-dn 3876).
I. Andronov et al. performed time-series observation on July 26, and
detected a superhump. The object was reported to be ~14.8 mag. On
July 27, they detected two superhump maxima with the amplitude of
0.21 mag. Using their two-night observations, the superhump period
was calculated to be 0.07267 (16) d. This period is slightly
shorter than that reported in IBVS4489 (vsnet-campaign-dn 3877,
3879). The Kyoto team also detected superhumps with the amplitude
of 0.3-0.4mag on July 26 (vsnet-campaign-dn 3879).
LQ Peg (RA = 21h36m19s.2, Dec = +11d40'54")
P. Schmidtke et al. reported that a fading of LQ Peg has started.
From images taken taken on 2003 July 24.15, the estimated magnitude
is V=17 or fainter. The last recorded fading of this VY Scl type
variable occurred in 1999 (vsnet-campaign-nl 134).
GRB030725 (RA = 20h33m59s.49, Dec = -50d40'56".0)
Accordin to [AAVSO-HEN] messages, B. Monard seems to have caught a
candidate optical afterglow of GRB030725. The object is reported to
have faded from an unfiltered CCD magnitude of 18.8 on 25.788 UT to
19.0 on 25.848 UT, 19.6 on 25.938 UT (vsnet-campaign-grb 33).
SN 2003gp (RA = 16h03m55s.47, Dec = +25d00'24".8)
SN 2003gp is hosted by UGC 10160, a barred-spiral galaxy. The
expected maximum for typical SN Ia is mag about 17.5
(vsnet-campaign-sn 660).
SN 2003gq (RA = 22h53m20s.68, Dec = +32d07'57".6)
SN 2003gq is hosted by NGC 7407, a spiral galaxy. The maximum for
typical SN Ia is mag about 16.5. Odd Trondal's observation (CRmag
= 16.3 on Jul. 27.001) suggests that this SN is of this type
(vsnet-campaign-sn 660).
(continuous targets)
V2573 Oph (= Nova in Oph 2003)
(RA = 17h19m14s.086, Dec = -27d22'35".21)
The nova has been given the permanent designation, V2573 Oph
(vsnet-campaign-nova 1353). The object is now at 11.5-11.8mag
(vsnet-campaign-nova 1350, 1355).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
D. West reported his new H_beta photometry, which showed no change
can be seen from the last observation (vsnet-campaign-be 254).
Z UMi (RA = 15h02m01s.35, Dec = +83d03'48".7)
Recent observations show that Z UMi may be slightly fainter
(vsnet-campaign-rcb 146).
V2540 Oph (RA = 17h37m34s.36, Dec = -16d23'18".4)
D. West reported that the H_alpha emission of this nova is
weakening (vsnet-campaign-nova 1354).
BL Lac (RA = 22h02m42.86s, Dec = +42d16'37.6")
The activity is still observed (vsnet-campaign-blazar 303).
*** Future schedule ***
X-Ray Timing 2003: Rossi and Beyond
November 3-5, 2003
Harvard-Smithsonian Center for Astrophysics
http://hea-www.harvard.edu/xrt2003/
[vsnet-campaign-xray 242]
AR UMa and AM Her campaign with the HST
TOO program conducted by S. Saar and F. Ringwald
see [vsnet-campaign-polar 24]
WEBT Campaign for AO 0235+16 with XMM-Newton
January-February 2004
please contact to Claudia M. Raiteri,
see [vsnet-campaign-blazar 301]
Multiwavelength AGN Surveys
a "Guillermo Haro" Astrophysics Conference
organized by INAOE
December 8-12, 2003
Cozumel, Mexico
http://vsnet.inaoep.mx/~agn2003/
[vsnet-campaign-agn 4]
IM Nor Campaign
by I. Hachisu (University of Tokyo) and the VSNET team
For more information, see [vsnet-campaign-nova 1241]
GRB Mini-Symposium in JENAM2003
For more information, http://vsnet.konkoly.hu/jenam03/
[vsnet-campaign-grb 31]
Conference: THE INTERPLAY AMONG BLACK HOLES, STARS AND ISM IN
GALACTIC NUCLEI
in Gramado, south of Brasil, March 1-5, 2004
for more information, please contact to BHSIGN@if.ufrgs.br
[vsnet-campaign-agn 3]
eta Car: The next "shell event"/X-ray eclipse
M. Corcoran reported the event will occur this summer.
Coordinated ground-based observations of eta car along with the
X-ray observations would be really important.
For more information:
Latest X-ray light curve:
http://lheawww.gsfc.nasa.gov/users/corcoran/eta_car/etacar_rxte_lightcurve/
[vsnet-campaign-sdor 23, 24,
25, 26, 28, 29, 46]
[vsnet-campaign-xray 172]
Light curve provided by S. Otero:
http://ar.geocities.com/varsao/Curva_Eta_Carinae.htm
[vsnet-campaign-sdor 22, 32, 33]
The 2003 Gamma Ray Burst conference
Hosted by Los Alamos,
in Santa Fe, New Mexico (USA), between September 8 and 12, 2003
http://grb2003.lanl.gov/
[vsnet-campaign-grb 13]
*** General information ***
Nova in Oph in 2003
H_alpha photometry by D. West:
http://members.aol.com/dwest61506/page35.html
[vsnet-campaign-nova 1351]
Image taken by B. Monard:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Novae/noph03.html
[vsnet-campaign-nova 1352]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
