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[vsnet-campaign-news 147] News from VSNET
*** News from VSNET ***
W. Liller discovered a nova in Sagittarius.
The X-ray satellite RXTE detected a new fast X-ray transient.
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 22, 2002, as VSNET campaign circulation 1303
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
Nova Sgr 2002 (RA = 17h59m59s.38, Dec = -30d53'21".9)
On April 15, W. Liller reported his discovery of a possible
nova of 9.2mag. The object is not seen on images taken before
April 13 (vsnet-campaign-nova 902, 903, 910, 911, 916, 918, 920).
P. Cacella confirmed this object at V=10.1 (vsnet-campaign-nova 904,
905). H. Yamaoka reported the nearest star is a USNO star of
r=16.9, which is a candidate of the progenitor of this nova
(vsnet-campaign-nova 908). M. Fujii performed spectroscopy on
April 18. The spectrum revealed that it is an Fe II-class nova
(vsnet-campaign-nova 922). The object is now fading.
(vsnet-campaign-nova 909, 912, 913, 907, 917, 919, 921, 923, 925, 927).
XTE J1901+014 (RA = 19h01m36s, Dec = +01d26'.4)
R. Remillard reported the discovery of a new fast X-ray
transient, XTE J1901+014 on April 17. The object, detected
with RXTE/ASM, was originally thought to be a gamma-ray
burst (GRB020406). The event began on 2002 April 6.76, lasting
more than 2 min and less than 3.15 hr, with a peak flux of 0.9 Crab.
Archival ASM data show a previous outburst at the same position on
1997 June 21, which was longer than 6 min and less than 8 hr,
with a peak flux of 0.4 Crab. The time scale for these eruptions
are reminiscent of the microquasar and black hole binary V4641 Sgr
(vsnet-campaign-xray 135).
CC Cnc (RA = 08h36m19s.17, Dec = +21d21'05".4)
G. Poyner reported that CC Cnc was 14.4mag on April 16, which
indicated that a new outburst of this SU UMa-type star started.
On April 17, R. Stubbings confirmed the object brightened to
13.8mag. The last superoutburst occurred in 2001 November
(vsnet-campaign-dn 2315).
OQ Car (RA = 09h55m58s.70, Dec = -68d09'41".7)
OQ Car, a recently recognized CV, experienced an outburst
(14.0mag) on April 18 as reported by R. Stubbings
(vsnet-campaign-dn 2320).
SN 2002ch
The host galaxy of SN 2002ch is KUG 1111+340, a small spiral
galaxy probably with a large distance. The UCB team reported that
it is of type II. The recession velocity of host galaxy is
reported as about 10200 km/s (vsnet-campaign-sn 415).
(continuous targets)
DV UMa (RA = 09h46m36s.67, Dec = +44d46'45".1)
The Kyoto team performed time-series photometry and reported
that superhumps decreased in amplitude. The profile of eclipses
was asymmetric, indicating an eccentric disk (vsnet-campaign-dn 2316).
A. Oksanen also performed time-series observations and reported
asymmetric eclipses which had a steep ingress and slower egress
(vsnet-campaign-dn 2330). The superoutburst is still ongoing
(vsnet-campaign-dn 2312, 2323).
V Sge (RA = 20h20m14s.75, Dec = +21d06'09".0)
V Sge was reported to be in a faint state on April 5
(vsnet-campaign-nl 79).
FG Sge (RA = 20h11m56s.14, Dec = +20d20'03".6)
Recent observations imply a possible brightening of FG Sge
(vsnet-campaign-rcb 23).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object remains at the faint state (vsnet-campaign-nl 77).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
The object started fading on April 18 (vsnet-campaign-dn 2325).
V854 Cen (RA = 14h34m49s.8, Dec = -39d33'18")
The object is approaching maximum (7.2mag on April 18)
(vsnet-campaign-rcb 24).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
S. Otero reported V=1.67 on April 19, which is brighter than
ever before in its long outburst (vsnet-campaign-be 181, 182).
FS Aur (RA = 05h47m48s.34, Dec = +28d35'11".1)
An outburst to 14.4mag was reported on April 16 by M. Simonsen
(vsnet-campaign-dn 2310).
V893 Sco (RA = 16h14m45s.26, Dec = -28d39'30".3)
The object is still slightly above mininum (vsnet-campaign-dn 2308).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
According to P. Nelson and R. Stubbings, the eclipsing SU UMa-type
dwarf nova V2051 Oph is undergoing a bright superoutburst.
The object was observed at 12.2 mag on April 18. The last likely
superoutburst was observed in 2000 November (vsnet-campaign-dn 2317,
2319, vsnet-campaign-v2051oph 1). The superoutburst is still
ongoing (vsnet-campaign-v2051oph 2).
SN 2002cf (RA = 12h54m31s.30, Dec = -06d51'24".8)
The CfA team took a spectrum on Apr. 15.29, which revealed
that it is of probably subluminous type Ia some 3 days before
maximum (vsnet-campaign-sn 412).
SN 2002cg (RA = 16h29m00s.48, Dec = +41d17'00".4)
The CfA team reported that it is of type I, but the exact
classification is uncertain. They remark that the spectrum is
resembles that of "hypernova" SN 2002ap about a month after
discovery. The UCB team reported that it seems to be normal
SN Ic (vsnet-campaign-sn 415).
RX J1155.4-5641 (RA = 11h55m27s.0, Dec = -56d41'53")
The superoutburst finished (vsnet-campaign-dn 2309, 2328),
and a normal outburst was reported on April 21 by B. Monard
(13.0mag)(vsnet-campaign-dn 2331).
V504 Cen (RA = 14h12m49s.36, Dec = -40d21'02".2)
V504 Cen remains in the faint state (vsnet-campaign-nl 78).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The object has recently been in a relatively faint state
(vsnet-campaign-dn 2329).
KS UMa (RA = 10h20m26s.54, Dec = +53d04'33".5)
The object has faded from the last superoutburst
(vsnet-campaign-dn 2313, 2321).
GZ Cnc (RA = 09h15m51s.70, Dec = +09d00'50".2)
The object is fading from the last outburst
(vsnet-campaign-dn 2311, 2322).
GK Per (RA = 03h31m12s.50, Dec = +43d54'17".8)
The object is fading (vsnet-campaign-gkper 85). The fading
became rapider since April 17. The long-term and spin modulations
are still evident (vsnet-campaign-gkper 86).
V2540 Oph (RA = 17h37m34s.36 Dec = -16d23'18".4)
A fading from the oscillation peak was observed around
April 15-18 (vsnet-campaign-nova 926).
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
A. Oksanen reported that the object was brighter (17.5mag) on
April 21 than usual (vsnet-campaign-dn 2314, 2326).
IM Nor (RA = 15h39m26s.47, Dec = -52d19'18".2)
The fading continues (vsnet-campaign-nova 924).
V838 Mon (RA = 07h04m04s.816, Dec = -03d50'50".94)
The object is still in the fading phase (vsnet-campaign-v838mon
340, 341, 342, 343, 344).
RR Tau (RA = 05h39m30s.53, Dec = +26d22'26".3)
The fading still continues (vsnet-campaign-orion 32, 33).
RS Oph (RA = 17h50m13s.56, Dec = -06d42'30".6)
The object is now slightly fainter than usual. It was
reported 11.8-11.9mag on April 17-18 (vsnet-campaign-symbio 13).
*** 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 ***
Nova
Images taken by P. Cacella:
http://intermega.globo.com/cacella/NovaSGR.htm
[vsnet-campaign-nova 906]
Sequence presented by M. Morel, see [vsnet-campaign-nova 914]
Spectrum taken by M. Fujii:
http://vsnet1.harenet.ne.jp/~aikow/p_nova_sgr_0418.gif
[vsnet-campaign-nova 922]
New web site about SNe:
http://vsnet.astrosurf.com/snweb/
(replaced from the old version of http://vsnet.astrosurf.com/snaude/)
[vsnet-campaign-sn 411]
V2540 Oph
Image taken by K. Haseda:
http://vsnet.tees.ne.jp/~khaseda/V2540Oph200204122814.jpg
[vsnet-campaign-nova 915]
V2051 Oph
Eclipse ephemeris, see [vsnet-campaign-dn 2318]
delta Sco
Light curve provided by S. Otero:
http://ar.geocities.com/varsao/Curva_delta_Sco.htm
[vsnet-campaign-be 181]
DV UMa
Eclipse ephemeris, see [vsnet-campaign-dn 2324]
IY UMa
Eclipse ephemeris, see [vsnet-campaign-dn 2327]
(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