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[vsnet-campaign-news 119] News from VSNET
*** News from VSNET ***
HT Cam experienced a very bright, short 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 January 1, 2002, as VSNET campaign circulation 1258
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
HT Cam (RA = 07h57m01s.2 Dec = +63d06'00")
H. Itoh reported on December 29 that HT Cam (a ultra
short-period CV; also renowned for its infrequent very brief
outbursts) experienced an unprecedentedly bright outburst
reaching 12.2mag (vsnet-campaign 1250, 1251, vsnet-campaign-dn
2006). J. Kemp confirmed the outburst at 13.1mag on
December 30 (vsnet-campaign-dn 2008). As also indicated by
this obesrvation, A. Oksanen reported a rapid decline in late
December 30 (vsnet-campaign 1256, vsnet-campaign-ip 67, 68
vsnet-campaign-dn 2009,2010). T. Kato reported strong modulations
on the decline trend (vsnet-campaign-dn 2011, vsnet-campaign-ip 69).
There are 0.063 d periodicity which is longer than the reported
orbital period and ~8 min period which is close to the quiescence
periodicity. These modulations have the other possibility to be
interpreted by QPOs (vsnet-campaign-ip 70, 71, vsnet-campaign-dn
2013, 2014). The object almose returned to quiescence level
(vsnet-campaign-ip 72, vsnet-campaign-dn 2015).
SN 2001iq (RA = 22h25m10s.42, Dec = +42d43'04".2)
SN 2001iq is located on a faint galaxy LEDA 214831, which is
near from (and possibly interacting with) UGC 12032 . If the
host galaxy is same distance as UGC 12032, the expected maximum
for a typical SN Ia is mag about 16.4 (vsnet-campaign-sn 303).
SN 2001ir (RA = 08h36m28s.12, Dec = -11d50'03".5)
SN 2001ir appeared in MCG -02-22-22, in which the expected
maximum for a typical SN Ia is mag about 16.3
(vsnet-campaign-sn 303).
SN 2001is (RA = 05h42m09s.07, Dec = +69d21'54".8)
NGC 1961 = the host galaxy of SN 2001is also produced SN Ia
1998eb. The recession velocity of NGC 1961 is 3934 km/s, from
which the expected maximum for SN Ia is mag about 15.6
(vsnet-campaign-sn 304).
SN 2001it (RA = 15h06m09s.40, Dec = +53d24'41".6)
MCG +09-25-15 = the host galaxy of SN 2001it is rather distant,
whose expected maximum if it is of type Ia is mag about 17.4
(vsnet-campaign-sn 304).
RZ LMi (RA = 09h51m50s.10, Dec = +34d07'29".8)
On December 28, T. Krajci reported that the object faded 1.5 mag
since last imaged 3 days ago (vsnet-campaign-dn 2004).
V644 Cen (RA = 11h43m06s.5, Dec = -60d44'02")
T. Kato reported a long-period EB candidate, V644 Cen.
This object was formerly considered as a ultra long-period
(>200 yr?) eclipsing binary (vsnet-campaign 1245).
V381 Sco (RA = 17h47m03s.3, Dec = -35d47'07")
T. Kato reported a long-period EB candidate, V381 Sco.
This object was considered as a long-period (P=6545 d) eclipsing
binary. The star is detected as a MSX5C source, and has a
moderate IR excess. Some of the literature gave a classification
of an OH/IR object (vsnet-campaign 1246).
V383 Sco (RA = 17h53m34s.3, Dec = -38d05'00")
T. Kato reported a long-period EB candidate, V383 Sco.
The period was considered to be 4900 days (vsnet-campaign 1247).
V532 Oph (RA = 17h32m42s.6, Dec = -21d51'40")
T. Kato reported a long-period EB candidate, V532 Oph.
The period was considered to be over 6000 days
(vsnet-campaign 1248).
OW Gem (RA = 06h31m41s.78, Dec = +17d04'56".0)
A primary eclipse of the long-period eclipsing binary
OW Gem is predicted to occur in early January. The observing
campaign is undertaken by several variable star organizations
(vsnet-campaign-ecl 1). The fading seems to be started on
December 30 when the object faded to 8.8mag
(vsnet-campaign-ecl 3).
RZ Cas (RA = 02h48m55s.5, Dec = +69d38'03")
P. Ferenc reported a flare with its duration over 1500s and
amplitude over 0.6mag (vsnet-campaign-ecl 4).
(continuous targets)
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
The object is still at very faint state (<14.5mag)
(vsnet-campaign-nova 665).
1RXS J232953.9+062814 (RA = 23h29m54s.3, Dec = +06d28'10".9)
M. Uemura reported an outburst at 14.3mag of this ultrashort
period SU UMa star on December 26 (vsnet-campaign 1242).
The object was then rapidly rising from 14.0mag to 13.4mag
(vsnet-campaign 1243). Follow-up observations by T. Krajci and
S. Kiyota revealed the object passed a maximum between Decemer
26.5 and 27 (UT) and began rapid fading. Some hints of short-term
modulations possibly appeared (vsnet-campaign 1244).
The fading continued through December 27 (vsnet-campaign-dn 2001,
2002, 2003).
SU Tau (RA = 05h49m03s.7, Dec = +19d04'21")
The object seems to be near maximum at 9th mag
(vsnet-campaign-rcb 7).
DY Per (RA = 02h35m17s.12, Dec = +56d08'44".7)
DY Per is further fading slowly (vsnet-campaign-rcb 6).
V407 Cyg (RA = 21h02m09s.87, Dec = +45d46'32".5)
The intermediate state still continues (vsnet-campaign-symbio 2).
SN 2001ig (RA = 22h57m30s.69, Dec = -41d02'25".9)
SN 2001ig goes quite bright (now mag 13). Its spectrum (on Dec.
16.1) resembles to SN IIb 1993J but much bluer and more rapidly
expanding (vsnet-campaign-sn 303).
V1028 Cyg (RA = 20h00m52.13s, Dec = +56d56'22.3")
The superoutburst entered a rapid decline phase
(vsnet-campaign-dn 2012).
V1413 Aql (RA = 19h03m46s.84, Dec = +16d26'17".1)
An eclipse will occur soon. It has remained calm
(vsnet-campaign-symbio 3).
V1039 Cen (RA = 13h55m41s.27, Dec = -64d15'57".9)
The object is still fainter than 12.1mag (vsnet-campaign-nova
664).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
MisV1147 = HBHA 65-53 is also found on Nobuo Ohkura's new
images taken on 2001 Sept. 17. To be surprised, it was fainter
than 14 mag in 2001 September. Then it brightened rapidly to
12.5 mag within two weeks, and it keeps slow brightening since
2001 October (vsnet-campaign-unknown 4).
*** Future schedule ***
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]
[vsnet-campaign-nova 666]
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 ***
HT Cam
sequence presented by B. Skiff, see [vsnet-campaign 1252],
(also see [vsnet-campaign-dn 2007], [vsnet-campaign 1254])
finding chart provided by Tovmassian:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/CVs/RXJ0757/rxj0757p63_fchart.jpg
[vsnet-campaign 1253]
photometry by G. Billings:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/CVs/RXJ0757/HTCam_29.gif
[vsnet-campaign 1257]
pulse light curve:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/CVs/RXK0757/pulse.gif
[vsnet-campaign-dn 2014]
V644 Cen
sequence presented by M. Morel, see [vsnet-campaign-be 149],
[vsnet-campaign-ecl 2]
VSNET 2001
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Summary/vsnet2001/vsnet2001.html
[vsnet-campaign 1255]
(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