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[vsnet-campaign-news 153] News from VSNET
*** News from VSNET ***
The microquasar V4641 Sgr brightened!
The superoutburst of IY UMa is still ongoing.
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 May 21, 2002, as VSNET campaign circulation 1313
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V4641 Sgr (RA = 18h19m21s.6, Dec = -25d24'25")
On May 19, R. Stubbings reported that the microquasar
(galactic jet source) V4641 Sgr was brightening to 11.5mag
(vsnet-campaign-xray 140). The object underwent a giant
outburst in 1999 September, preceded by optical brightening
(vsnet-campaign-xray 141, vsnet-campaign-news 152,
vsnet-campaign-v4641sgr 1). The object was then reported to
faded to 12th mag on May 20 (vsnet-campaign-v4641sgr 2, 4, 5, 7).
C. Bailyn reported that the V-band magnitude is 2.1 magnitudes
brighter than quiescence (vsnet-campaign-v4641sgr 6).
M. Linnolt reported on May 21 that the object varied chaotically
from mag 12.5 to 12.8 with a "period" of just a few seconds
(vsnet-campaign-v4641sgr 8).
The duration of the outburst in 1999 was so short (< 1 day
in X-ray) that the close monitoring is encouraged.
V344 Lyr (RA = 18h44m31s.80, Dec = +43d22'10".2)
As reported by M. Simonsen, the SU UMa-type dwarf nova V344 Lyr
experienced an outburst of 14.1mag on May 15 (vsnet-campaign-dn 2407).
The outburst seems to be a superoutburst (vsnet-campaign-dn 2431).
SN 2002ct (RA = 12h47m22s.53, Dec = +28d00'13".9)
SN 2002ct was discovered by the LOTOSS team on images taken
on May 10 and 12. The host galaxy of SN 2002ct is 2MASXi
J1247215+280021 = [KK90] 122, which seems to be located at some
beyond the Coma cluster. The expected maximum for typical SN Ia
is mag about 17 (vsnet-campaign-sn 425).
SN 2002cu (RA = 18h10m50s.40, Dec = +31d06'32".3)
SN 2002cu was discovered by the LOTOSS team on images taken
on May 11 and 12. The host galaxy of SN 2002cu is NGC 6575,
an elliptical galaxy at low Galactic latitude (b=21.7o).
The CfA team has revealed that it is of type Ia near maximum on
May 13.45 (vsnet-campaign-sn 425).
TK5 (RA = 19h17m26s.5, Dec = +37d10'41")
A possible outburst (16.0: mag) was reported on May 14
(vsnet-campaign-dn 2414).
AH Her (RA = 16h44m09s.99, Dec = +25d15'02".1)
The object entered a standstill (vsnet-campaign-dn 2424).
1ES1959+650 (RA = 19h59m59s.8, Dec = +65d08'54")
According to IAUC No. 7903, the BL Lac object 1ES1959+650
is strongly detected in TeV gamma rays (vsnet-campaign-blazar 263).
V844 Her (RA = 16h25m01s.69, Dec = +39d09'25".9)
H. McGee reported on May 18 that this short-period (Psh=0.05592 d)
SU UMa-type dwarf nova is undergoing an outburst (12.5mag). The
last confirmed outburst was in 2001 August, and a possible
unconfirmed sighting in 2002 February at 13.5. T. Kato commented
that the object resembles SW UMa in its outburst pattern, and further
detailed observations are strongly encouraged (vsnet-campaign-dn 2426).
The outburst still continues (vsnet-campaign-dn 2432, 2436).
OY Car (RA = 10h06m22s.46, Dec = -70d14'04".4)
An outburst, which was first detected by R. Stubbings at
12.4mag on May 17, continued on May 18, indicating that it seems
to be a superoutburst (vsnet-campaign-dn 2422, 2427).
The superoutburst is now ongoing (vsnet-campaign-dn 2433).
FH Sct (RA = 18h45m14s.82, Dec = 09d25'35".5)
The object again faded to 14.0V mag, according to the S. O'Connor's
observation on May 4 (vsnet-campaign-rcb 35, 36).
SN 2002cw (RA = 18h46m02s.40, Dec = +32d17'03".2)
SN 2002cw was discovered by the LOTOSS team on an image taken
on May 16. The host galaxy of SN 2002cw is NGC 6700, whose
galactic latitude is somewhat low (b = 15o.1). The expected
maximum for typical SN Ia is mag about 16.0 (vsnet-campaign-sn 427).
The UCB team has revealed that it is of type Ib SN, a few weeks
after the explosion on May 18 UT (IAUC 7905)(vsnet-campaign-sn 429).
SN 2002cx (RA = 13h13m49s.72, Dec = +06d57'31".9)
SN 2002cx was discovered by W. M. Wood-Vasay et al. on May 12.
The host galaxy of SN 2002cx is CGCG 044-035, which is a member
of a group WBL 435. The spectrum taken by the CfA team on May 17
shows that it is a peculiar SN Ia before maximum light. It resembles
that of SN 1991T a week before maximum, which was intrinsically
bright SN Ia (~1 mag than normal one). The expected maximum for
typical SN Ia is mag about 16.5 (vsnet-campaign-sn 427).
V1363 Cyg (RA = 20h06m11s.58, Dec = +33d42'37".7)
M. Simonsen reported a possible outburst (14.8mag) of an
unknown-type CV on May 21 (vsnet-campaign-dn 2438).
(continuous targets)
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
The superoutburst is still ongoing (vsnet-campaign-dn 2406,
2411, 2415, 2420). The light curve on May 11-13 show superhumps
with the period of 0.07584(4) d. It indicates that the period
was decreasing at that time (vsnet-campaign-dn 2405). On May 17,
the light curve shows "triple" humps which may come from ordinary
superhumps and late superhumps (vsnet-campaign-dn 2418).
On May 19, the superhumps was doubly peaked, but the secondary
maxima seem to occur earlier than what are expected for late
superhumps (vsnet-campaign-dn 2434).
SN 2002cr (RA = 14h06m37s.59, Dec = -05d26'21".9)
The object is now around the maximum (vsnet-campaign-sn 426).
IM Nor (RA = 15h39m26s.47, Dec = -52d19'18".2)
The object is still in the smooth fading (vsnet-campaign-nova 933).
V1039 Cen (RA = 13h55m41s.27, De = -64d15'57".9)
The object still shows oscillations in brightness
(vsnet-campaign-nova 932).
V503 Cyg (RA = 20h27m15s.61, Dec = +43d41'45".5)
The superoutburst continues (vsnet-campaign-dn 2416).
The observation on May 21 by M. Simonsen (14.5mag) may be a
rebrightening (vsnet-campaign-dn 2439).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The object was reported to still remain at the bright state
(vsnet-campaign-dn 2412, 2421).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
S. Otero reported 1.76mag on May 19 (vsnet-campaign-be 184).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
A new outburst (13.6mag) occurred on May 18 (vsnet-campaign-dn 2428).
The object again faded on May 19 (vsnet-campaign-dn 2437).
V893 Sco (RA = 16h14m45s.26, Dec = -28d39'30".3)
A relatively bright outburst (12.4mag) was reported on May 15
(vsnet-campaign-dn 2409), and then the object started fading
on May 16 (vsnet-campaign-dn 2417).
V2540 Oph (RA = 17h37m34s.36 Dec = -16d23'18".4)
The oscillations was likely less prominent (vsnet-campaign-nova 934).
On May 17, a relatively large-amplitude brightening (to 8.9mag)
was reported (vsnet-campaign-nova 935).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
The unusual prolonged outburst still continues
(vsnet-campaign-v2051oph 14, 15, 16, 17, vsnet-campaign-dn 2419).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
An outburst (14.9mag) was reported on May 14 (vsnet-campaign-dn 2408).
The outburst has continues on May 15-18 (vsnet-campaign-dn 2430).
UW Cen (RA = 12h43m16s.6, Dec = -54d31'37")
The object was reported to faded again (<14.5mag) on May 18
(vsnet-campaign-rcb 37).
UX Ant (RA = 10h57m09s.03, Dec = -37d23'55".8)
The object is still in the deep minimum (vsnet-campaign-rcb 34).
OQ Car (RA = 09h55m58s.70, Dec = -68d09'41".7)
As reported by R. Stubbings on May 13, the object experienced
an outburst (14.4mag) again (vsnet-campaign-dn 2403).
ST Cha (RA = 10h47m31s.3, Dec = -79d27'17")
The object is reported to be in a standstill (vsnet-campaign-dn 2429).
BF Ara (RA = 17h38m10s.40, Dec = -47d10'43".4)
The object experienced an outburst (14.1mag) on May 15
(vsnet-campaign-dn 2413). The object is still in outburst
(vsnet-campaign-dn 2425).
*** 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 ***
IY UMa
Light curve observed at Ouda observatory:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/TmzV85/iyuma02.gif
[vsnet-campaign-dn 2402]
Eclipse ephemeris, see [vsnet-campaign-dn 2435]
UX UMa
Observations from M. Koppelman, see [vsnet-campaign-data 95]
V893 Sco
Eclipse ephemeris, see [vsnet-campaign-dn 2410]
OY Car
Eclipse ephemeris, see [vsnet-campaign-dn 2423]
V4641 Sgr
References, see [vsnet-campaign-v4641sgr 3]
V838 Mon
Preprint by U. Munari et al., see [vsnet-campaign-v838mon 370]
LX Ser
Observations from M. Koppelman, see [vsnet-campaign-data 96]
V2051 Oph
Eclipse ephemeris, see [vsnet-campaign-v2051oph 18]
V1363 Cyg
Chart presented by M. Simonsen:
http://joevp.20m.com/cgi-bin/i/charts/sxncharts/Cyg_v1363_sxn.jpg
http://joevp.20m.com/cgi-bin/i/charts/sxncharts/Cyg_v1363_Rsxn.jpg
[vsnet-campaign-dn 2440]
VSNET page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/v1363cyg.html
[vsnet-campaign-dn 2441]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page