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[vsnet-campaign 1315] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V359 Cen (RA = 11h58m15s.29, Dec = -41d46'07".9)
On May 28, R. Stubbings reported an outburst of the dwarf nova
V359 Cen. The object had been regarded as a possible nova until the
discovery of an outburst in 1999 July by R. Stubbings. The last
outburst was detected by R. Stubbings on 2001 April 25
(vsnet-campaign-dn 2465). R. Santallo performed time-series
photometry on May 31. His observation detected a fully developed
superhump signal with an amplitude of 0.30 mag. The light curves
indicate that the period is 0.08152(1) d, which makes V359 Cen as
one of below-the-gap SU UMa-type systems with the longest orbital
periods (vsnet-campaign-dn 2491, 2492). The object might belong to
a sub-class including EF Peg and V725 Aql, both of which show
unusually infrequent outbursts for their superhump period
(vsnet-campaign-dn 2494). There may be even a hint of super-QPOs in
the May 29 light curve taken by P. Nelson. T. Kato reported that
the superhump period decreased at least during the early part of
this superoutburst (vsnet-campaign-dn 2502, 2505). The outburst is
now ongoing (vsnet-campaign-dn 2468, 2482, 2499).
TV Crv (RA = 12h20m23s.56, Dec = -18d27'02".7)
R. Stubbings detected an outburst (13.1mag) on May 30. TV Crv is
an SU UMa-type dwarf nova with relatively rare outbursts. The last
outburst (superoutburst) was reported in 2001 February
(vsnet-campaign-dn 2473). The Kyoto team detected superhumps with
amplitudes of 0.15-0.20mag on June 2 (vsnet-campaign-dn 2507). The
superoutburst continues (vsnet-campaign-dn 2486, 2501).
QW Ser (RA = 15h26m13s.99, Dec = +08d18'03".8)
An outburst of 13.2mag was detected on May 29 by R. Stubbings.
The object was then reported to further brighten, which indicates
that the current outburst is a superoutburst (vsnet-campaign-dn
2478). The Kyoto team detected fully developed superhumps with
amplitudes of 0.3-0.35mag on June 2 (vsnet-campaign-dn 2506). The
superoutburst is now ongoing (vsnet-campaign-dn 2485, 2500).
HS Vir (RA = 13h43m38s.5, Dec = -08d14'04".1)
An outburst of 14.2-14.0mag was reported on May 28 by R. Stubbings
(vsnet-campaign-dn 2466).
CL Pup (RA = 07h30m01s92, Dec = -19d28'01".2)
A bright outburst (13.8-13.7mag) was reported on May 29
(vsnet-campaign-dn 2469). The object remained bright on May 30
(vsnet-campaign-dn 2474).
CH Cyg (RA = 19h24m33s.07, Dec = +50d14'29".5)
CH Cyg is rather rapidly fading. Similar systematic fadings were
observed in 1999 June and 2000 May (vsnet-campaign-symbio 16).
Z Cha (RA = 08h07m16s.29, Dec = -76d32'20".9)
An outburst (12.3-12.4mag) of the eclipsing SU UMa star, Z Cha was
reported on May 31 by R. Stubbings (vsnet-campaign-dn 2476). The
outburst still continues, which indicates that the current outburst
must be a superoutburst (vsnet-campaign-dn 2504).
SN 2002de (RA = 16h16m30s.38, Dec = +35d42'30".2)
This SN appeared in NGC 6104, whose recession velocity is about
8400 km/s. The observed magnitude is somewhat brighter than
expected maximum of normal SN Ia (vsnet-campaign-sn 433).
TK5 (RA = 19h17m26s.5, Dec = +37d10'41")
An outburst of 14.8mag was reported on June 1 by C. P. Jones
(vsnet-campaign-dn 2480). T. Vanmunster performed time-series
photometry and reported a flat light curve with no relevant
modulations (vsnet-campaign-dn 2487, 2493).
RY Ser (RA = 17h23m07s54, Dec = -12d47'44".0)
R. Stubbings detected an outburst (13.4mag) of this possible UGSS
type star on May 31 (vsnet-campaign-dn 2481). The object was still
in outburst on June 1 without significant fading (vsnet-campaign-dn
2488).
NSV 10934 (RA = 18h40m52s.26, Dec = -83d43'10".24)
An outburst (12.9mag) of this NSV/ROSAT dwarf nova was reported on
June 2 by R. Stubbings. The last outburst was seen in 2002 April
(vsnet-campaign-dn 2495).
V1830 Sgr (RA = 18h13m51s, Dec = -27d42'23")
R. Stubbings detected a 12.7mag outburst on June 2. Although the
object is likely a UGSS star as judged from the outburst pattern,
the large outburst amplitude would make it a potentially interesting
target for further photometric study (vsnet-campaign-dn 2496).
Suspected variable (nova?) in M7
J. M. Fernandez observed a ~7mag object, which is possibly
identified with GSC 7386 355 (vsnet-campaign-unknown 70). The 2MASS
color is not red, indicating that the object is not a (late-type)
flare star. Furthermore, the ROSAT hardness ratios are relatively
hard (unlike flare stars), possibly suggesting that something
unusual may be taking place (vsnet-campaign-unknown 69).
(continuous targets)
V4641 Sgr (RA = 18h19m21s.6, Dec = -25d24'25")
Observations by R. Santallo on May 25 detected steadily increasing
activity, which smoothly evolved into the violent state later on May
25 (vsnet-campaign-v4641sgr 67). Short-term fluctuations weakened,
or disappeared on May 27 (vsnet-campaign-v4641sgr 65, 66). On May
29, M. Uemura reported a gradual brightening which was probably a
part of normal elliptical modulations observed at quiescence
(vsnet-campaign-v4641sgr 68, 70). C. Markwardt reported that the
majority of the X-ray violent flaring activity was on May 24-25, but
that there was one large (May 26.65 UT) and several small X-ray
flares on May 26 (vsnet-campaign-v4641sgr 69). Possible
fluctuations were reported on June 2 (vsnet-campaign-v4641sgr73).
The object has remained at quiescence (vsnet-campaign-v4641sgr 71,
72).
SN 2002by (RA = 17h50m18s.58, Dec = -59d33'51".6)
According to IAUC 7910, the spectrum of SN 2002by was taken at
Siding Spring Observatory on May 18.53UT, which revealed that it is
of type Ia, about 2 months after maximum. Thus, the discovery,
which made on Mar. 31 UT, was at around maximum phase
(vsnet-campaign-sn 431).
V504 Cen (RA = 14h12m49s.36, Dec = -40d21'02".2)
The faint state still continues (vsnet-campaign-nl 86).
SN 2002cv (RA = 10h18m03s.68, Dec = +21d50'06".2)
The infrared spectrum of SN 2002cv taken on May 22.3-23.3 at UKIRT
shows it is of type Ia around B maximum. There is some resemblance
with intrinsically brighter SN Ia 1991T, though SN 2002cv is
reddened by A(V) about 6 mag (vsnet-campaign-sn 432).
PU CMa (RA = 06h40m47s.67, Dec = -24d23'14".6)
The outburst is ongoing, but has become slightly fainter
(vsnet-campaign-dn 2463, 2472).
V844 Her (RA = 16h25m01s.69, Dec = +39d09'25".9)
The object entered a rapid fading phase from superoutburst
(vsnet-campaign-dn 2467, 2470, 2479).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object has remained at the faint state (vsnet-campaign-nl 85).
OY Car (RA = 10h06m22s.46, Dec = -70d14'04".4)
The object is fading from the superoutburst (vsnet-campaign-dn
2464, 2483, 2498).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
V803 Cen is undergoing a bright outburst (likely superoutburst),
which was detected on May 29 by R. Stubbings (vsnet-campaign-dn
2471). The last superoutburst started on March 21, making a
supercycle length of ~70 d. This value is quite characteristic to
the "ER UMa-type" outburst pattern of V803 Cen seen in 1998-1999.
After "standstills" in 2000 and 2001 (IBVS 5091), the star has
resumed its ER UMa-type activity. The present observation makes the
similarity between V803 Cen and CR Boo more concrete than ever
(vsnet-campaign-dn 2475). The outburst is now ongoing
(vsnet-campaign-dn 2489, 2503).
V Sge (RA = 20h20m14s.75, Dec = +21d06'09".0)
The object was reported to further brighten since around May 27
(vsnet-campaign-nl 84).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The object again brightened on May 31 (13.7mag) and June 1
(13.5mag)(vsnet-campaign-dn 2490).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
The object is still on the long fading tail at about 15mag
(vsnet-campaign-v2051oph 20).
*** 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
X-ray light curve with RXTE/PCA:
http://lheawww.gsfc.nasa.gov/users/swank/v4641sgr/
[vsnet-campaign-v4641sgr 69]
V359 Cen
Superhump light curve:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/V359_Cen/v359sh.gif
[vsnet-campaign-dn 2492]
Z Cha
Eclipse ephemeris, see [vsnet-campaign-dn 2477]
OY Car
Eclipse ephemeris, see [vsnet-campaign-dn 2484]
Please discard vsnet-campaign-v838mon 371 and 372, because they
contained a virus (W32/Klez).
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
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