[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]
[vsnet-campaign-news 143] News from VSNET
*** News from VSNET ***
GK Per is still brightening.
A new X-ray transient was discovered. It may be a black hole
candidate.
For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.
---------------------------------------------------------------------------
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
----------------------------------------------------------------------------
The following was issued on March 25, 2002, as VSNET campaign circulation 1299
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
XTE J1908+094 (RA = 19h08m50s, Dec = +09d22'.5)
According to IAUC 7856, Woods et al. reported a new X-ray
transient on Feb. 21. The analysis of the X-ray properties
suggests that the object is a new blackhole candidate
(vsnet-campaign-xray 126). To search its optical and infrared
counterpart is encouraged.
QW Ser (RA = 15h26m13s.99, Dec = +08d18'03".8)
As reported by R. Stubbings on March 21, the SU UMa-type dwarf
nova QW Ser experienced an outburst. The reported magnitude
(13.1mag) is slightly fainter than those of past superoutburst
maxima (vsnet-campaign-dn 2196). The object faded rapidly, which
indicates the outburst was a normal one (vsnet-campaign-dn 2201,
2206).
MKN 421 (RA = 11h04m27s, Dec = +38d12'32")
As reported by M. Simonsen on March 23, the object experienced
an outburst of 12.5mag (vsnet-campaign-blazar 255).
IR Gem (RA = 06h47m34s.58, Dec = +28d06'22".7)
The object was reported to be in a possible superoutburst
reaching 11.6mag on March 20 (vsnet-campaign-dn 2198).
U Mon (RA = 07h30m47s.45, Dec = -09d46'36".9)
This RV Tau-type star was in an interchanged primary minimum
(~7mag) on March 16 (vsnet-campaign-rvtau 1). On interchanged
minima I and II in RV Tau stars, T. Kato commented that R Sct
frequently shows consecutive minima II (vsnet-campaign-rvtau 2).
T. Ishida commented that deterministic system with unpredictable
behavior (so-called "Chaos") is one of the possible cause of such
an irregularity (vsnet-campaign-rvtau 3).
KS UMa (RA = 10h20m26s.54, Dec = +53d04'33".5)
An outburst of 14.4mag was detected on March 13 by P. A.
Dubovsky and G. Poyner. It seems to be a normal outburst
(vsnet-campaign-dn 2186).
V818 Sco (RA = 16h19m55s.07, Dec = -15d38'24".5)
The object is now bright. B. Monard reported 12.0mag on
March 18 (vsnet-campaign-xray 125).
AM Cas (RA = 02h26m23s.40, Dec = +71d18'32".3)
The object experienced an outburst and reached 13.8mag on
March 17. This star shows rather irregular variations during
the past few months (vsnet-campaign-dn 2190).
DY Per (RA = 02h35m17s.12, Dec = +56d08'44".7)
The object further faded to 12th mag (vsnet-campaign-rcb 20, 21).
NY Ser (RA = 15h13m02s.39, Dec = +23d15'07".1)
NY Ser, a long period SU UMa star, experienced an outburst
which was reported by M. Simonsen on March 22 at 14.6mag
(vsnet-campaign-dn 2202). The object was reported to remain the
same magnitude on March 23 (vsnet-campaign-dn 2205).
CI UMa (RA = 10h18m13s.01, Dec = +71d55'42".8)
As reported by M. Simonsen on March 23, the SU UMa-type dwarf
nova CI UMa is in outburst. The last superoutburst was in 2001
November (vsnet-campaign-dn 2203). The outburst is now ongoing
and it is now about 13.8-13.9mag (vsnet-campaign-dn 2209).
(continuous targets)
OJ287 (RA = 08h51m57s, Dec = 20d17'59")
The object is now brightening and has reached 14.5mag
(vsnet-campaign-blazar 256).
GZ Cnc (RA = 09h15m51s.70, Dec = +09d00'50".2)
The object faded from the last normal outburst
(vsnet-campaign-dn 2191).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The last outburst faded around March 13 (vsnet-campaign-dn 2188).
A new outburst, reported by M. Simonsen on March 22, still
continues (vsnet-campaign-dn 2207).
1RXP J113123+4322.5 (RA = 11h31m22s.426, Dec = +43d22'38".51)
The object entered a rapid fading on March 15-16. M. Uemura
reported that the average superhump period during the plateau
phase is 0.065069(4)d. The rapid fading stopped when the object
became ~2mag fainter and still above the quiescent level.
During March 16-17, the object gradually faded at a rate of
0.1mag/d. In conjunction with the short period and the period
increase of superhumps, this phenomenon is similar to large-
amplitude SU UMa-type dwarf novae (vsnet-campaign-dn 2192).
During the post-outburst phase, the Kyoto team detected humps
with two peaks: one was probably associated with ordinary
superhumps (amplitude ~0.1mag), and the other was late superhumps
(~0.5mag) (vsnet-campaign-dn 2193). Their period was 0.06448(5) d,
shorter than that observed during the superoutburst
(vsnet-campaign-dn 2195). The gradual fading is still ongoing
(vsnet-campaign-dn 2211, 2212).
SN 2002bo (RA = 10h18m06s.51, Dec = +21d49'41".7)
The brightening continues. It has reached 13.9mag
(vsnet-campaign-sn 382, 383, 384, 385).
Nova LMC 2002
(RA = 05h36m46s.4, Dec = -71d35'35".34)
The object is fading now (vsnet-campaign-nova 885, 889).
AX Per (RA = 01h36m22s.72, Dec = +54d15'02".7)
The object is now in an eclipse (vsnet-campaign-symbio 12).
GK Per (RA = 03h31m12s.50, Dec = +43d54'17".8)
The object is still in rising, and some observations show
that it has entered 10th mag (vsnet-campaign-gkper 59, 61, 63,
64, 65, 66, 67, 68). The observations by the Kyoto team revealed
that the object brightened at a rate of 0.05mag/d since March 16
while it was relatively calm before March 15. The long-term
(P~0.0525d) and short-term (0.005-0.007d) modulations have
continuously appeared (vsnet-campaign-gkper 60, 62, 69).
SN 2002ap (RA = 01h36m23s.85, Dec = +15d45'13".0)
The object is gradually fading (vsnet-campaign-sn 197, 198, 199).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
The object was faint until March 21 when R. Stubbings detected
a bright outburst to 12.6mag (vsnet-campaign-dn 2187, 2197).
The outburst continues (vsnet-campaign-dn 2200, 2204, 2208).
V2540 Oph (RA = 17h37m34s.36 Dec = -16d23'18".4)
The object stated fading after the strong oscillation
(vsnet-campaign-nova 887, 888).
V838 Mon (RA = 07h04m04s.816, Dec = -03d50'50".94)
The slow fading continues (vsnet-campaign-v838mon 292, 293,
294, 295, 296, 297, 298, 299). The fading rate appears to become
more gradual since March 21-22 (vsnet-campaign-v838mon 301, 302,
303, 304). The object is now at about 8mag and the fading almost
stopped (vsnet-campaignv838mon 305).
V4740 Sgr (RA = 18h11m45s.82, Dec = -30d30'49".9)
D. West reported revised photometry using Tycho-2 catalogue
and showed V-Ic <= 0, indicating very blue for a nova
(vsnet-campaign-nova 883).
chi Cyg (RA = 19h50m33s.9, Dec = +32d54'50")
The object is now fading from the bright maximum
(vsnet-campaign-mira 22).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The bright state continues (vsnet-campaign-be 178).
IM Nor (RA = 15h39m26s.47, Dec = -52d19'18".2)
The fading rate appears to become more gradual
(vsnet-campaign-nova 886).
AT Cnc (RA = 08h28m36s.92, Dec = +25d20'02".6)
The object faded from the outburst and then entered a standstill
(vsnet-campaign-dn 2189).
V1039 Cen (RA = 13h55m41s.27, De = -64d15'57".9)
Using on recent observations, A. Retter detected two possible
periodicity: ~1.8 hr, which is presumably the orbital period, and
~20 min, which is probably the spin period. He suggested that
this nova is an intermediate polar (vsnet-campaign-nova 884).
The strong oscillation still continues (vsnet-campaign-nova 890).
RR Tau (RA = 05h39m30s.53, Dec = +26d22'26".3)
The object is gradually brightening and has been reported to
reach 10.6mag on March 24 (vsnet-campaign-orion 30).
HL CMa (RA = 06h45m17s.0, Dec = -16d51'35")
Recent observations indicate HL CMa entered a new starndstill
(vsnet-campaign-dn 2194, 2199), and then, again faded
(vsnet-campaign-dn 2210).
*** 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
Time-series photometry by T. Havlik, see [vsnet-campaign-data 93]
V838 Mon
Spectra since February 2002:
http://perso.wanadoo.fr/sdmorata/V838/V838Mon.html
[vsnet-campaign-v838mon 300]
(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