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[vsnet-campaign 890] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
HD172468 = NSV24534 (RA = 18h37m41s, Dec = +51d56'45")
According to Astron. Astrophys. 364, 706 (2000), Messima et al.
reports that the 7-th mag star HD172468 showed temporary 1-4 mag
fadings, and sometimes undetectable by their APT observations.
T. Kato reported that the object is not (very) hydrogen-deficient,
and looks different from a classical R CrB-type star. The GSC
magnitude 11.16 is more than three magnitudes fainter than usual.
However, Hipparcos didn't pick up this star as a variable star
(vsnet-campaign 886).
QW Ser (RA = 15h26m13s.99, Dec = +08d18'03".8)
The SU UMa-type dwarf nova QW Ser is undergoing an outburst at
14.7mag as reported by R. Stubbings on April 29. The last superoutburst
was observed in 2001 Feb. which followed a rather atypical course
associated with a likely precursor well before the supermaximum
(vsnet-campaign 887). The Kyoto team confirmed the outburst and
performed time-series observations on April 30. The current
magnitude is about 13.3mag (vsnet-campaign-dn 724).
V359 Cen (RA = 11h58m15s.29, Dec = -41d46'07".9)
R. Stubbings reported that the dwarf nova V359 Cen experienced
an outburst at 14.0mag on April 25. The object had been regarded
as a possible nova until the discovery of an outburst in 1999 July.
The next outburst (the third historical outburst = the last outburst)
was detected by R. Stubbings on 2000 May 15 (vsnet-campaign 882).
The observation of 15.0mag by R. Stubbings on April 28 seems to
indicate that the outburst was terminated (vsnet-campaign-dn 706, 715),
but the same magnitude was observed on the next day, which implies
the outburst continues (vsnet-campaign-dn 720).
DV UMa (RA = 09h46m36s.67, Dec = +44d46'45".1)
As reported by C. P. Jones on April 24, the eclipsing SU UMa
type dwarf nova DV UMa experienced an outburst at 14.5mag
(vsnet-campaign-dn 691). Previously reported outbursts are
1995 Feb. (normal outburst), 1997 Apr. (superoutburst) and
1999 Dec. (superoutburst) (vsnet-campaign 874). The Kyoto team
performed time-series observations on April 25 at Kyoto, April 26
and 27 at Ouda (vsnet-campaign 880, 883, vsnet-campaign-dn 710).
R. Ishioka, the Kyoto team, reported rather rapid fading from
the outburst on April 26 and 27 (vsnet-campaign 883, vsnet-campaign-dn 710).
Reported observations have supported the rapid fading, and
the outburst is a normal one (vsnet-campaign-dn 704, 714).
SN 2001bb (RA = 13h43m25s.31, Dec = -29d48'13".1)
M. Schwartz, on behalf of LOTOSS collaboration (Mike and KAIT),
discovered SN 2001bb on Apr 29.3 (mag about 16.5) and confirmed one
day later when SN became mag 0.2 brighter. The position is about
16".8 west and 1".4 south of the nucleus of the tilted spiral galaxy
IC 4319. The expected maximum of the typical SN Ia on this galaxy
is about 15.6, and it seems that SN 2001bb is in the rising phase
(vsnet-campaign-sn 172).
EP Car (RA = 10h28m23s.21, Dec = -58d57'58".6)
The dwarf nova EP Car experienced a relatively rare outburst
as reported by R. Stubbings on April 26 (14.8mag). The last outburst
was observed in 2000 Feb. (mv=14.3). Time-resolved photometry was
conducted by G. Garradd during this outburst, and modulations similar
to superhumps were observed (vsnet-campaign 884). Reported observations
indicate that the outburst was terminated within a few days
(vsnet-campaign-dn 716).
LMCV3804 (RA = 05h38m42s.4, Dec = -69d06'02")
As reported by M. Mattiazzo, the WR-type star in the LMC,
LMC V3804 is noticeably brighter (9.0mag April 28) than usual
(vsnet-campaign-be 114).
Two dwarf novae on Moscow Plates
T. Kinnunen has advised that IBVS 5058 issues two newly discovered
dwarf novae TK4 and TK5.
TK4 191358.47 +404409.1 14.9-(17.2p UGSU:
TK5 191726.5 +371041 14.3-(17.1p UG P=60:
No ROSAT identifications have been found.
Further monitoring for outbursts is strongly encouraged.
(continuous targets)
WR104 = HadV82 (RA = 18h02m04s.0, Dec = -23d37'41")
S. Kiyota reported magnitudes of Ic=10.14, V=12.70, and B=14.7:
on April 22 (vsnet-campaign 873). K. Takamizawa reported
photographic magnitude since 1994 March (vsnet-campaign 877,
vsnet-campaign-data 62, vsnet-campaign-data 63). T. Kato performed
period analysis using the reported data to VSNET and yield
220+/-30d periodicity which may be identical with the binary period
(vsnet-campaign 888). On the contrary, C. Lloyd reported the best
period at 2180+/-130 days, corresponding to the clear variation
in the data (vsnet-campaign 889).
AK Cnc (RA = 08h55m18s.49, Dec = +11d18'06".2)
The object has been faded (vsnet-campaign-dn 698).
GK Per (RA = 03h31m12s.50, Dec = +43d54'17".8)
The slightly bright state still continues. It is now about
12.9mag (vsnet-campaign-ip 54).
DI UMa (RA = 09h12m22s.16, Dec = +50d49'39".1)
The superoutburst still continues (vsnet-campaign-dn 692, 700, 708).
M. Uemura reported that it is about 15.6mag on April 30
(vsnet-campaign-dn 724).
TU Crt (RA = 11h03m36s.50, Dec = -21d37'45".6)
S. Kiyota's time-series photometry on April 13 and 15 is available
in [vsnet-campaign-data 60] and [vsnet-campaign-data 61], respectively.
The superoutburst was terminated (vsnet-campaign-dn 719).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
The oscillating is still observed during the last week
(vsnet-campaign-dn 693, 699, 713).
3C 279 (RA = 12h56m11s.1, Dec = -05d47'20")
The activity of this blazar still continues (vsnet-campaign-blazar 187).
M. Villata reported a rapidly fading from R=13.56 on April
23 to R=13.97 and 14.37 on April 24 and 26, respectively
(vsnet-campaign-blazar 188). S. O'Connor reported it has significantly
brightened in the V-band (V=13.8) on April 29 (vsnet-campaign-blazar 189,
vsnet-campaign-blazar 190).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The outburst continues. The current magnitude is about 13.9mag
(vsnet-campaign-dn 696, 709, 723).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
B. Monard reported that V445 Pup has undergone further fading.
The object was observed at mag 11.0 on Apr. 24. This is the faintest
magnitude ever reported since the eruption (vsnet-campaign-nova 286).
The fading trend continued until April 26 (vsnet-campaign-nova 287,
288, 289), and then, seems to stop (vsnet-campaign-nova 292).
OJ287 (RA = 08h51m57s, Dec = 20d17'59")
The activity still continues (vsnet-campaign-blazar 186).
BZ Cam (RA = 06h29m34s.49, Dec = +71d04'39".5)
After the gradual recovering, the object became bright to 12.2mag
on April 24 as reported by M. Reszelski (vsnet-campaign-nl 15).
EI UMa (RA = 08h38m22s.1, Dec = +48d38'01")
The object is still active (vsnet-campaign-nl 14, 16).
CI Aql (RA = 18h52m03.6s, Dec = -01d28m38.9s)
The object is still bright. The current magnitude is about
14.7 (vsnet-campaign-nova 285). I. Hachisu reported that their
paper has been accepted for publication in ApJ Letters
(astro-ph/0104461) (vsnet-campaign-nova 290).
Delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
S. Otero reported that the star is brightened again and
the activity is always in agreement with a 72 - 77 day period
(vsnet-campaign-be 107). He also reported the brightest magnitude
of 1.79 on April 27 (vsnet-campaign-be 113). The bright state
continues (vsnet-campaign-be 112).
U Gem (RA = 07h55m05s.55, Dec = +22d00'09".2)
The slightly bright state continues until April 25 when
J. Gunther reported possible outburst at 13.2mag (vsnet-campaign-dn 695,
701). On April 26, the object finally showed an outburst
(vsnet-campaign-dn 703), and reached full maximum on April 27 and 28
(vsnet-campaign-dn 711, 717). The outburst still continues
(vsnet-campaign-dn 707, 717, 722).
V893 Sco (RA = 16h14m45.26s, Dec = -28d39m30.3s)
B. Monard reported that the eclipsing dwarf nova V893 Sco is
undergoing an outburst. The object was caught in outburst on
Apr. 24, at mag 12.8 (vsnet-campaign 879). The outburst continues
until April 26 when B. Monard report a rapid fading
(vsnet-campaign-dn 697, 702, 705, 712).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
MV Lyr is fading from the recent bright state (vsnet-campaign-nl 17).
TV Col (RA = 05h29m25s.5, Dec = -32d49'05".2)
No clear outburst has been reported since the end of March
(vsnet-campaign-ip 55).
V4643 Sgr (RA = 17h54m40s.43, Dec = -26d14'15".7)
The object is now in a fading stage. The current magnitude is
about 15.0mag (vsnet-campaign-nova 291).
BV Cen (RA = 13h31m19s.6, Dec = -54d58'34")
A small outburst to 12.0mag was finished. It is in quiescent state
at about 13.0mag (vsnet-campaign-dn 721).
*** Future schedule ***
CR Boo and V803 Cen campaign conducted by J. Patterson
For more information, see [vsnet-campaign-dn 640 and vsnet-campaign 852]
Elizabeth and Frederick White Workshop
AGN variability across the Electromagnetic Spectrum
25 - 29 June 2001 Sydney, Australia
For more information, see [vsnet-campaign-blazar 168].
Two Years of Science with Chandra *
* This meeting will also be the 12th Annual Maryland Astrophysics
Conference
September 5-7, 2001
For more information, see [vsnet-campaign-xray 66]
*** General information ***
DV UMa
eclipse ephemeris, see [vsnet-campaign 875]
V893 Sco
eclipse ephemeris, see [vsnet-campaign 879]
U Gem
eclipse ephemeris, see [vsnet-campaign 718]
VIIth catalogue of galactic WR stars
for more information, see [vsnet-campaign 876] or:
http://saturn.sron.nl/pub/karelh/UPLOADS/VIIWRCAT.pdf
Corrigendum
In the last Summary,
"DI UMa (RA = 09h12m22s.16, Dec = +50d49'39".1)
G. Poyner reported that .....
... with an amplitude of 1.5mag (vsnet-campaign-dn 690)."
should be read
"... with an amplitude of 0.15mag (vsnet-campaign-dn 690)."
[vsnet-campaign 871, 872]
(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
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