[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]
[vsnet-campaign 1317] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V877 Ara (RA = 17h16m58s.80, Dec = -65d32'58".6)
R. Stubbings reported on June 7 that this dwarf nova experienced a
bright outburst (13.8-13.9mag)(vsnet-campaign-dn 2526). The data
taken by R. Santallo on June 9 show fully developed superhumps
(amplitude 0.25-0.30 mag), establishing that V877 Ara is a new
member of SU UMa-type dwarf novae. The system seems to have a
relatively long (around 0.08 d) superhump period (vsnet-campaign-dn
2538). T. Kato noticed that the position of the object may be
different from previous identifications (vsnet-campaign-dn 2540).
H. Yamaoka reported the object is identified with a USNO_A2.0 star
of r=17.8mag (vsnet-campaign-dn 2543).
V729 Sgr (RA = 19h16m49s.15, Dec = -26d14'33".2)
R. Stubbings reported on June 7 that V729 Sgr experienced an
outburst (13.2mag). This is the first visual outburst detection
of an outburst reported to VSNET. The brightness surpasses the
cataloged range (vsnet-campaign-dn 2534). According to Cieslinski
et al. (2000) PASP 112, 349, this object is known to show shallow
eclipses (in quiescence). The object is also suspected to be a Z
Cam-type dwarf nova (vsnet-campaign-dn 2535). The Kyoto team
performed time-series observations on June 9 (vsnet-campaign-dn
2542).
IP Peg (RA = 23h23m08s.7, Dec = +18d24'59".1)
An outburst (14.3mag) was reported on June 5 by M. Reszelski
(vsnet-campaign-dn 2515).
SN 2002df (RA = 20h45m39s.33, Dec = -04d57'04".7)
MCG -01-53-6, the host galaxy of SN 2002df, is a spiral galaxy
(vsnet-campaign-sn 434). It turned out to be type Ia a week after
maximum on June 4. The recession velocity of the SN is about 7000
km/s (vsnet-campaign-sn 435).
SN 2002dg (RA = 14h57m16s.29, Dec = +05d54'00".6)
This SN was discovered during the course of the NEAT survey. The
apparent host galaxy is quite dim and unnamed (vsnet-campaign-sn 434).
X-ray transient in M31 (RA = 00h41m54s.64, Dec = +40d56'48".0)
According to ATEL #97, a bright X-ray transient was discovered in
M31 (vsnet-campaign-xray 143).
UY Cen (RA = 13h16m31s.90, Dec = -44d42'14".9)
According to BAA VSS Circular 112, 3 (J. Toone), UY Cen is
reported to have undergone a deep minimum (mag 10) in 2002 February
to March. Such a deep fading may have been compared to a RCB-type
fading. T. Kato reported that VSNET observations may suggest that
the fading already started in 2001, but the depth may be
inconsistent with the report in BAA VSS Circular (vsnet-campaign-rcb
38, 39).
SN 2002dh (RA = 15h24m49s.35, Dec = -22d45'57".7)
SN 2002dh was discovered in the anonymous faint spiral galaxy.
The position is about 7" north and 3" east of the apparent host
galaxy (vsnet-campaign-sn 436).
(continuous targets)
V359 Cen (RA = 11h58m15s.29, Dec = -41d46'07".9)
T. Kato reported that the period analysis using data between May
31 and June 3 indicated that the period shortening had stopped. The
average superhump period was calculated to be 0.08112 d. This
strongly suggests that there was a rapid evolution of superhumps
around May 29. This interpretation is strengthened by the likely
presence of "super-QPOs" in the May 29 observation
(vsnet-campaign-dn 2508, 2509). Combined data sets until June 5
show a slight shortening of the superhump period, although the
entire set of data may not be expressed by a single Pdot. There is
also some suggestion of the beat phenomenon (vsnet-campaign-dn
2521). H. Yamaoka performed astrometry using images taken by
R. Santallo. He proposed identifications with a GSC-2.2 star of
r=18.46 or USNO-A2.0 star of R=17.7 (vsnet-campaign-dn 2522, 2524).
The superoutburst was terminated by a rapid decline started on June
7 (vsnet-campaign-dn 2512, 2529).
TV Crv (RA = 12h20m23s.56, Dec = -18d27'02".7)
The superoutburst is ongoing (vsnet-campaign-dn 2513, 2533, 2536,
2541).
QW Ser (RA = 15h26m13s.99, Dec = +08d18'03".8)
The data on June 3 still show prominent, sharp superhumps
(0.20-0.25 mag)(vsnet-campaign-dn 2517). On June 7, T. Kato
reported the decrease of amplitude of superhumps to 0.15 mag. There
was also a hint of secondary superhump (phase ~0.4)
(vsnet-campaign-dn 2525). The superoutburst still continues
(vsnet-campaign-dn 2520, 2532, 2537, 2539).
Z Cha (RA = 08h07m16s.29, Dec = -76d32'20".9)
The superoutburst is still ongoing (vsnet-campaign-dn 2514, 2531).
SN 2002de (RA = 16h16m30s.38, Dec = +35d42'30".2)
It turned out to be of type Ia, about 4 days before maximum light
on June 2.23 UT. The Si II 615nm line, characteristic for SN Ia, is
slightly weak. These features may suggest that they are somewhat
overluminous SN Ia (vsnet-campaign-sn 435).
SN 2002db (RA = 14h34m51s.63, Dec = +48d39'52".9)
This SN has more brightened than expected. It turned out to be of
type Ia, about 2 days before maximum on June 1.29 (vsnet-campaign-sn
435).
NSV 10934 (RA = 18h40m52s.26, Dec = -83d43'10".24)
The object faded from the outburst on June 4, as reported by
R. Stubbings (vsnet-campaign-dn 2510). T. Kato reported a possible
quiescent counterpart with an USNO star (r=16.4) (vsnet-campaign-dn
2518).
V4641 Sgr (RA = 18h19m21s.6, Dec = -25d24'25")
The object is still active (vsnet-campaign-v4641sgr 81, 85, 89,
90). G. Masi reported that observations by F. Mallia on May 31-June
1 show an evident modulation, with a full amplitude around 0.1 mag
(vsnet-campaign 1316, vsnet-campaign-v4641sgr 80). M. Uemura
reported a 0.4mag-hump around June 2.66 (vsnet-campaign-v4641sgr
74). The short-term modulations became more prominent on June 3,
while the average magnitude has been at the quiescent level
(vsnet-campaign-v4641sgr 75, 76, 77). A large hump to Rc=12.6 was
reported on June 4 (vsnet-campaign-v4641sgr 78). The large hump has
a peak at about June 4.65 and a duration of ~3 hr. The small flares
(0.2mag) were also observed around the hump. They have a weak, but
characteristic periodicity (50-100s). After the object experienced
the hump, it returned at quiescent level (vsnet-campaign-v4641sgr
79, 84). The ~0.1mag modulations still appeared on May 5, and the
object was relatively calm on June 6 (vsnet-campaign-v4641sgr 88,
91). The activity was also reported on June 9
(vsnet-campaign-v4641sgr 92).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
S. Otero reported 1.75 and 1.71 mag on June 1 and 3, respectively
(vsnet-campaign-be 186).
OY Car (RA = 10h06m22s.46, Dec = -70d14'04".4)
The object experienced a post-outburst rebrightening on June 7, as
reported by R. Stubbings (vsnet-campaign-dn 2527).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
As reported by R. Stubbings on June 4, the object faded from the
bright outburst (vsnet-campaign-dn 2511). It again brightened to
13.4mag on June 7 (vsnet-campaign-dn 2530).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The object was reported to be still active (vsnet-campaign-dn
2523).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
A rebrightening to 14.6mag was reported on June 7 by R. Stubbings
(vsnet-campaign-v2051oph 21).
V4741 Sgr (RA = 17h59m59s.38, Dec = -30d53'21".9)
G. Sostero reported four-color photometry on May 31 (V=13.82)
(vsnet-campaign-nova 936).
V2540 Oph (RA = 17h37m34s.36, Dec = -16d23'18".4)
G. Sostero reported four-color photometry on May 30 (V=10.40)
(vsnet-campaign-nova 936). A possible minor brightening was
reported on June 8 (vsnet-campaign-nova 937).
*** Future schedule ***
Texas in Tuscany
XXI Symposium on Relativistic Astrophysics
Florence, Italy, December 9-13, 2002
For more information:
http://vsnet.arcetri.astro.it/~texaflor/
[vsnet-campaign-xray 142]
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]
Blazar meeting at Tuorla: June 17-21, 2002
for more information, see http://vsnet.astro.utu.fi/blazar02
[vsnet-campaign-blazar 232]
*** General information ***
V4641 Sgr
Predicted conjunction time, see [vsnet-campaign-v4641sgr 82, 87]
Light curve on June 4 observed at Ouda:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/v4641sgr02.html
[vsnet-campaign-v4641sgr 83]
New epehemeris reported by J. A. Orosz, see
[vsnet-campaign-v4641sgr 86, 87]
IP Peg
Eclipse ephemeris, see [vsnet-campaign-dn 2516]
NSV10934
Image taken by P. Nelson:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/NSV10934/nelson.gif
[vsnet-campaign-dn 2519]
OY Car
Eclipse ephemeris, see [vsnet-campaign-dn 2528]
V877 Ara
Images taken by R. Santallo:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/V877_Ara/san1.jpg
[vsnet-campaign-dn 2540]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page