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[vsnet-campaign-news 117] News from VSNET 86
*** News from VSNET ***
A bright outburst of a peculiar dwarf nova FS Aur was detected.
IW And is now re-brightening after the last outburst.
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 December 24, 2001, as VSNET campaign circulation 1240
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V407 Vul (RA = 19h14m26s.08, Dec = +24d56'43".4)
This object is proposed to be a binary system with a orbital
period of 9.49 min (ref. astro-ph/0111358 and reference therein)
Long monitoring may be important (vsnet-campaign-1239).
FS Aur (RA = 05h47m48s.34, Dec = +28d35'11".1)
T. Krajci reported a 0.4-mag sinusoidal pattern in the 3-hr
light curve obtained on December 18 (vsnet-campaign-dn 1988).
An outburst of 15.5mag was detected by G. Poyner on December 21
(vsnet-campaign-dn 1999).
IR Gem (RA = 06h47m34s.58, Dec = +28d06'22".7)
As reported by E. Muyllaert on December 16, the outburst of
this SU UMa-type dwarf nova was detected at 12.3mag
(vsnet-campaign-dn 1989). On Decemver 19, a rapid fading was
reported, which indicates it was a normal outburst
(vsnet-campaign-dn 1992).
UU Aur (RA = 06h36m32s.70, Dec = +38d26'43".9)
As seen in the recent reported observations, this SR-type carbon
star seems to be experiencing one of the faintest states (~6.6mag)
in recent years (vsnet-campaign-mira 2).
DK Lac (RA = 22h49m46s.86, Dec = +53d17'18".3)
According to IAUC 7777, the old nova DK Lac entered a deep
(V = 19.4) faint state. This fading may be related to VY Scl-type
phenomenon (or may be associated with V446 Her-like outbursts).
Further monitoring is strongly encouraged
(vsnet-campaign-nova 661).
OJ 287 (RA = 08h51m57s, Dec = 20d17'59")
G. Poyner reported that the blazar OJ 287 experienced an
outburst of 14.1mag on December 22 (vsnet-campaign-blazar 236).
The object was reported to be still faint on November 24
(vsnet-campaign-blazar 237). M. Kidger commented that OJ287
is prone to short-lived flares of up to 1 magnitude amplitude which
usually last for only a week (vsnet-campaign-blazar 238).
RR Tau (RA = 05h39m30s.53, Dec = +26d22'26".3)
RR Tau is now very faint reaching to 13.2mag
(vsnet-campaign-orion 1).
V723 Cas (RA = 01h05m05s.40, Dec = +54d00'40".8)
The MISAO team reported a detection of a small brightening to
13.97mag of V723 Cas = Nova Cas 1995 in 2001 October 13 - 14
(vsnet-campaign-nova 663).
SU Tau (RA = 05h49m03s.7, Dec = +19d04'21")
Recent observations imply that the object finally returned
to maximum of about 10.3mag (vsnet-campaign-rcb 5).
3C 66A (RA = 02h22m39s.6, Dec = +43d02'08")
This blazar is now faint at about 14.5mag
(vsnet-campaign-blazar 239).
kappa CMa (RA = 06h49m50s.45, Dec = -32d30'30".2)
The GCAS-type variable kappa CMa is now bright at about 3.6mag
as reported by S. Otero and T. Kato (vsnet-campaign-be 148).
(continuous targets)
DY Per (RA = 02h35m17s.12, Dec = +56d08'44".7)
The very slow fading is still ongoing
(vsnet-campaign-rcb 3, 4).
SN 2001if (RA = 02h28m54s.93, Dec = +38d05'52".7)
The Asiago team was revealed that SN 2001if is of type Ia, about
2 weeks after maximum on Dec. 19.87 (IAUC 7779). Though this SN
apparently locates somewhat distant (about 70" west) from the nearest
galaxy (pair) VV 107, it became certain that SN and this galaxy have
similar recession velocities (around 11,400 km/s) by the SN spectrum
(vsnet-campaign-sn 301).
SN 2001ig (RA = 22h57m30s.69, Dec = -41d02'25".9)
This supernova further brightened to 13.0mag on December 19
as reported by A. Pearce (vsnet-campaign-sn 299). IAUC 7777
informed that the radio emission from this SN was detected.
Type II/IIb SNe are sometimes a strong radio emitter, because of
the interaction of the SN shock with the circumstellar matter
which had outflowed from the progenitor during the supergiant
phase (vsnet-campaign-sn 300).
V1028 Cyg (RA = 20h00m52.13s, Dec = +56d56'22.3")
The superoutburst still continues (vsnet-campaign-dn 1991,
1995, 1998).
V1039 Cen (RA = 13h55m41s.27, Dec = -64d15'57".9)
The object further faded (vsnet-campaign-nova 662).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
S. Yoshida reported the MISAO observations, and reported the
gradual brightening has already started in 2000 October when
the object was faint reaching 13.50mag (vsnet-campaign-unknown 2).
T. Kato commented that if the object is a pre-main sequence
emission-line star, the star may be an object belonging to a small
subclass with occasional fadings like WW Vul, BO Cep etc
(vsnet-campaign-unknown 3).
IW And (RA = 01h01m08s.82, Dec = +43d23'27".3)
The object faded by ~2mag as seen in observations by the Kyoto
team on December 18 (vsnet-campaign-dn 1990). The fading continued
until December 21 when M. Simonsen reported a rebrightening to
14.4mag (vsnet-campaign-dn 1993, 1994). The outburst continues
(vsnet-campaign-dn 1996).
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
The slow fading still continues (vsnet-campaign-dn 1997).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object is reported to be brighter (vsnet-campaign-nl 57).
*** Future schedule ***
Request for observations of Seyfert galaxies
The VSNET team have received a request for photometric
observations of the following (and possibly other) Seyfert galaxies
from Valya Doroshenko. Please observe them and report.
NGC 1275, 3227, 3516, 4051, 4151, 4593, 6814, 7469;
Mkn 6, 335, 509, 530, 1040; Akn 120, 564; Cyg X-1
[vsnet-campaign-blazar 234,235]
[vsnet-campaign-xray 102, 103]
[vsnet-campaign-agn 1]
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]
Blazar meeting at Tuorla: June 17-21, 2002
for more information, see http://vsnet.astro.utu.fi/blazar02
[vsnet-campaign-blazar 232]
International workshop
"XEUS - studying the evolution of the hot universe"
March 11-13, 2002 ; MPE Garching, Germany
for more information, see
http://wave.xray.mpe.mpg.de/conferences/xeus-workshop
[vsnet-campaign-xray 98]
*** General information ***
Light curve of Mira presented by
Nihon Henkousei Kenkyuukai (Japan Variable Stars Study Association)
http://vsnet4.airnet.ne.jp/mira/nhk/mira_campaign/mira2001_lc.html
[vsnet-campaign-mira 1]
(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