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[vsnet-campaign-news 115] News from VSNET 85
*** News from VSNET ***
The bright supernova SN 2001ib shows some features which are typical
for a somewhat subluminous event.
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 17, 2001, as VSNET campaign circulation 1238
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2001ie (RA = 10h16m50s.70, Dec = +60d16'44".5)
A. Dimai reported the discovery by A. Bincoletto of an apparent
supernova (mag about 16.5) in the image on Dec. 9 in IAUC 7771.
H. Yamaoka reported that the recession velocity of UGC 5542
(the host elliptical galaxy of SN 2001ie) is 9215 km/s, from which
the expected maximum for the normal SN Ia is about 1 mag dimmer than
reported (vsnet-campaign-sn 293). The CfA team (IAUC 7774) and
the Asiago team (IAUC 7776) took a spectrum of this object, which
revealed that it is of type Ia a few days after maximum on Dec. 13
(vsnet-campaign-sn 298).
SN 2001if (RA = 02h28m54s.93, Dec = +38d05'52".7)
G. M. Hurst reports the discovery by T. Boles of an apparent
supernova (mag 17.2) in the image taken on Dec. 9 in IAUC 7771.
H. Yamaoka reported that the expected maximum of the typical
SN Ia on this galaxy is mag about 17.5 (vsnet-campaign-sn 293).
SN 2001ig (RA = 22h57m30s.69, Dec = -41d02'25".9)
R. Evans discovered SN 2001ig (14.5mag) visually on Dec. 10.43,
and confirmed by C. Bembrick with CCD on Dec. 10.55. The position
is about 139" east and 109" north of the big face-on open-spiral
galaxy NGC 7424. The spectrum taken at Las Campanas Observatory
shows it is in the very early phase. The CfA team reports the
provisional classification as type II/IIb, but further spectroscopy
is needed to confirm (vsnet-campaign-sn 295, 296).
V632 Cyg (RA = 21h36m04s.268, Dec = +40o26'19".63)
M. Simonsen reported an outburst (13.7mag) of V632 Cyg on
December 11. This outburst is the first one reported in this
year (vsnet-campaign-dn 1966, 1967). The object started gradual
fading from December 12 (vsnet-campaign-dn 1972, 1974, 1977).
The time-series photometry on December 12 at Kyoto showed
relatively flat, but some hints of 0.1mag, 2-hr period modulations
(vsnet-campaign-dn 1975, 1979). A rapid fading was observed
on December 14 by the Kyoto team (vsnet-campaign-dn 1981).
The fading still continues (vsnet-campaign-dn 1984, 1985).
H. Yamaoka performed astrometry using CCD images taken by the
Kyoto team. A counterpart in USNO-A2.0 catalogue is a star with
r=16.4 and b=16.6 (vsnet-campaign-dn 1986, 1987).
V1028 Cyg (RA = 20h00m52.13s, Dec = +56d56'22.3")
M. Simonsen detected a possible superoutburst of the short-period
SU UMa-type dwarf nova V1028 Cyg at 13.3mag on December 12.
The last superoutburst was observed in early Novevmber, 2000
(vsnet-campaign-dn 1971). J. Pietz reported 0.25mag humps in
the light curve on December 13 (vsnet-campaign-dn 1976).
The superoutburst continues (vsnet-campaign-dn 1978, 1982).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
This new variable star is now brightening. The object reached
12.34mag on 2001 October 3 from about 13.4mag on 2000 October
(vsnet-campaign-unknown 1). Follow-up observations are encouraged.
(continuous targets)
IW And (RA = 01h01m08s.82, Dec = +43d23'27".3)
The object remains the bright outburst state
(vsnet-campaign-dn 1968, 1969, 1983). Observations by the Kyoto
team showed slow fading of the object. The maximum was on
December 7 (vsnet-campaign-dn 1980).
SN 2001ib (RA = 22h15m38s.72, Dec = +37d17'56".0)
IAUC 7773 informed that this SN is of type Ia near maximum
light on Dec. 10, and the spectrum shows some features which are
typical for a somewhat subluminous event. The shifts of
absorption lines are consistent that this SN has the same
recession velocity as NGC 7242. Thus, this galaxy should be
nearer (factor ~ 2) than estimated from v_r (vsnet-campaign-sn 294).
1RXS J232953.9+062814 (RA = 23h29m54s.30, Dec = +06d28'10".9)
Both observations by the Kyoto team and T. Krajci detected
a small rebrightening started on December 2. The rising rate
is relatively slow, and the object became 0.15mag brighter on
the monotonous gradual decline trend on December 2 - 3. After
this peak, its fading rate returned to the monotonous gradual
trend before the rebrightening. Its amplitude and rising/fading
rates are somewhat different from those of the last rebrightening
of this object and those typically observed after superoutbursts
(vsnet-campaign 1237).
BL Lac (RA = 22h02m42.86s, Dec = +42d16'37.6")
Reported observations on December 10 and 11 indicate that the
object became slightly brighter (about 14.4mag)
(vsnet-campaign-blazar 233).
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
The slow fading still continues (vsnet-campaign-dn 1970).
SDSSp J173008.38+624754.7 (RA = 17h30m08s.38, Dec = +62d47'54".7)
The Kyoto team detected a minor brightening of an amplitude of
1.4mag on December 11 (vsnet-campaign-dn 1973).
*** 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 ***
X-ray transients in M31
M. Garcia et al. reported some X-ray transients detected by the Chandra
X-ray observatory in ATEL #79 (vsnet-campaign-xray 99).
MCQC J162847-4152
Reports by G. S. Tsarevsky et al. in ATEL #80, see
[vsnet-campaign-xray 100, 101]
V1028 Cyg
Light curve presented by J. Pietz:
http://home.t-online.de/home/Jochen.Pietz/v1028_01.gif
[vsnet-campaign-dn 1976]
SN 2001ib
Spectrum and image presented by M. Gavin:
http://home.freeuk.com/m.gavin/sn2001ib.gif
http://home.freeuk.com/m.gavin/snspec.htm
[vsnet-campaign-sn 297]
(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