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[vsnet-campaign-news 108] News from VSNET 79
*** News from VSNET ***
A superoutburst of CI UMa is now ongoing. 1RXS J232953.9+062814
is in outburst and large humps are detected.
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 November 5, 2001, as VSNET campaign circulation 1210
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
CI UMa (RA = 10h18m13s.01, Dec = +71d55'42".8)
As reported by T. Kinnunen on October 29, the SU UMa-type dwarf
nova CI UMa is undergoing a superoutburst. It was 13.8mag on
October 29. The supercycle of this system has not been yet firmly
established; there is even a possibility that the system does not
have a firm supercycle what could be unexpected (vsnet-campaign-dn 1202).
The Kyoto team performed time-series observations on October 30
and 31 (vsnet-campaign-dn 1817), and detected 0.3mag superhumps
with a period about 0.0630(9) d. This observation confirmed the
short-period nature of CI UMa (vsnet-campaign-dn 1820).
The superoutburst is still ongoing (vsnet-campaign-dn 1840).
1RXS J232953.9+062814 (RA = 23h29m54s.30, Dec = +06d28'10".9)
P. Schmeer reported an outburst of 12.5mag on November 3
(vsnet-campaign 1205). The Kyoto team performed time-series
observation on November 4 (vsnet-campaign 1206), and detected
strong humps with a short period of 0.043 day
(vsnet-campaign 1208, 1209).
SN 2001fc (RA = 21h08m26s.69, Dec = +18d11'17".0)
IAUC 7741 reported the discovery of SN 2001fc on October 28.
H. Yamaoka reported that the host galaxy UGC 11683 is a eastern
component of a pair KPG 553. The expected maximum for typical
SN Ia is about mag 15.8 (vsnet-campaign-sn 270).
SN 2001fd (RA = 22h14m29s.64, Dec = +05d01'37".6)
IAUC 7742 reported the discovery of SN 2001fd in UGC 11957
on November 1 and 2. H. Yamaoka reported that the expected
maximum for typical SN Ia in UGC 11957 is about 17mag
(vsnet-campaign-sn 271).
SN 2001fe (RA = 09h37m57s.10, Dec = +25d29'41".3)
IAUC 7742 reported the discovery of SN 2001fe in UGC 5129 on
November 2 and 3. H. Yamaoka reported that the expected maximum
for typical SN Ia in UGC 5129 is mag about 15.3 (vsnet-campaign-sn 271).
SN 2001ff (RA = 08h57m00s.97, Dec = +13d11'59".5)
IAUC 7743 reported the discovery of SN 2001ff in UGC 4685 on
November 2 and 3. H. Yamaoka reported that the expected maximum
for typical SN Ia in UGC 4685 is about 15.3mag (vsnet-campaign-sn 271).
T Leo (RA = 11h38m26s.96, Dec = +03d22'08".1)
As reported by J. Gunther on October 30, this dwarf nova
experienced an outburst. The bright magnitude of 10mag and
the duration indicate that it is a superoutburst
(vsnet-campaign-dn 1799, 1813). The possible superoutburst
continues. It is now about 10.5mag (vsnet-campaign-dn 1822, 1828).
SU UMa (RA = 08h12m28s.20, Dec = +62d36'22".6)
An outburst was reported on October 23 by T. Kinnunen at 13.7mag.
The object further brightened to 11.3mag as reported by J. Gunther
on October 30 (vsnet-campaign-dn 1800).
TK4 (RA = 19h13m58s.47, Dec = +40d44'09".1)
An outburst of 14mag was reported on October 31 (vsnet-campaign
1203, vsnet-campaign-dn 1814, 1827), however it seems to be
mis-identified (vsnet-campaign-dn 1830, 1832, 1833, 1836).
(continuous targets)
AM Cas (RA = 02h26m23s.40, Dec = +71d18'32".3)
The strong activity is still ongoing (vsnet-campaign-dn
1798, 1835).
Possible Nova in SMC (RA = 00h46m27s.56, Dec = -73d29'46".21)
B. Liller performed low-resolution spectroscopy and detected
a strong narrow H-alpha emission line whose FWHM is 1525 (75) km/s
(vsnet-campaign-nova 648, 651). B. Liller reported a revised
position of the nova as shown above (vsnet-campaign-nova 652).
TV Col (RA = 05h29m25s.5, Dec = -32d49'05".2)
M. Uemura reported that the object again experienced an outburst
of 13.2mag on October 31. The last outburst was reported eight
days before this outburst (vsnet-campaign-ip 65).
AM Her (RA = 18h16m13s.4, Dec = +49d52'03".1)
The fading continues and the current magnitude is about 14.2mag
(vsnet-campaign 1204).
U Gem (RA = 07h55m05s.55, Dec = +22d00'09".2)
The outburst passed the peak of this outburst, and then,
started gradual fading. The object is now about 9.5mag
(vsnet-campaign-dn 1796, 1802, 1807, 1815, 1824, 1829, 1834).
SDSSp J173008.38+624754.7 (RA = 17h30m08s.38, Dec = +62d47'54".7)
The rapid fading from the outburst was reported on October 29
(vsnet-campaign-dn 1801, 1804, 1806). T. Vanmunster performed
time-series observations on October 28/29 and reported the revised
superhump period to be 0.07933(4)d (vsnet-campaign-dn 1803). His
data showed rapid decline with a rate of 3mag/d. M. Uemura reported
the humps were still visible in the light curve on October 28 and 29.
In October 28 light curve, we can see the sudden growth of a late
superhump. On October 29, the phase of humps was apparently shifted
(vsnet-campaign-dn 1810). The gradual fading continued at least
until October 30 when the Kyoto team detected a possible humps in the
light curve (vsnet-campaign-dn 1819). The light curve on October 31
shows sinusoidal variations (vsnet-campaign-dn 1831).
IP Peg (RA = 23h23m08s.7, Dec = +18d24'59".1)
The outburst finished (vsnet-campaign-dn 1823).
Nova Cen 2001 (RA = 13h55m41s.27, Dec = -64d15'57".9)
It is fading from the second maximum. The object now seems
to be fainter than about 12.0mag (vsnet-campaign-nova 649, 653).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object became slightly fainter (vsnet-campaign-nl 50).
V2275 Cyg (RA = 21h03m02s.00, Dec = +48d45'52".9)
The nova is smoothly fading (vsnet-campaign-nova 650).
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
The slow fading continues (vsnet-campaign-dn 1797, 1805, 1821,
1826, 1837). On October 31, it was noticed that the object
became slightly brighter (vsnet-campaign-dn 1808, 1811, 1812),
but no major rebrightening has been detected (vsnet-campaign-dn
1816, 1818). On October 30, the hump amplitude was 0.35 mag,
with a general profile resembling singly humped superhump-like
one (vsnet-campaign-dn 1816).
*** Future schedule ***
WZ Sge campaign
D. Steeghs wrote:
"Several of us are organizing a campaign on the current outburst
of WZ Sge, using a large variety of ground based facilities as well as
space observatories. A web-page has been setup listing the scheduled
observations so far which we intend to keep up to date at:
http://vsnet.astro.soton.ac.uk/~ds/wzsge.html
"
For more information, see [vsnet-campaign 1039]
Supernova campaign: A great opportunity for amateurs by M. Schwartz.
For more detailed information, see [vsnet-campaign-sn 233]
announce on the HST observations, see [vsnet-campaign-sn 240, 246]
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]
*** General information ***
WZ Sge
eclipse ephemeris, see [vsnet-campaign-dn 1825].
TK4
image by A. Henden:
http://ftp.nofs.navy.mil/pub/outgoing/aah/temp/tk4v.jpg
[vsnet-campaign-dn 1838, 1839,
1841, 1842]
(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