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[vsnet-campaign-news 182] News from VSNET
*** News from VSNET ***
SW UMa entered a rapid fading phase from a rare superoutburst.
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 11, 2002, as VSNET campaign
circulation 1348
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
KV And (RA = 02h17m13s.85, Dec = +40d41'30".6)
As detected by M. Simonsen on November 5, the SU UMa-type dwarf
nova, KV And experienced an outburst of 14.3mag. The last reported
outburst was in 2001 August (vsnet-campaign-dn 2977). The Kyoto
team detected fully grown superhumps of 0.4mag on November 5, which
implies the current outburst is a superoutburst (vsnet-campaign-dn
2978). All data up to November 8 show clear persistence of
superhumps (vsnet-campaign-dn 3005). The superoutburst still
continues (vsnet-campaign-dn 2995, 3011).
SN 2002hl (RA = 11h24m40s.12, Dec = +38d46'03".0)
NGC 3665, a host galaxy of SN 2002hl is a nearly lenticular
galaxy, which likely produce only SN Ia, whose expected maximum is
mag about 13.9. The object was reported to be 16.3C on Nov. 4 and
16.5C on Nov. 5 (vsnet-campaign-sn 494). According to IAUC 8011,
the ESO team and the UCB team has revealed that it is type Ia SN
about one or two months after the maximum light on Nov. 5-6
(vsnet-campaign-sn 499).
BL Tel (RA = 19h06m37s.99, Dec = -51d25'01".0)
S. Otero reported that the symbiotic eclipsing system BL Tel has
entered a new primary minimum. According to Hipparcos observations
and his data of the two most recent eclipses, the period is more
than a day shorter than the GCVS value of 778.6 days, and he
reported a preliminary results of his period analysis which shows
the period is 776.9+/-0.5 d (vsnet-campaign-symbio 41).
V1343 Aql (RA = 19h11m49s.60, Dec = +04d58'57".9)
V1343 Aql (=SS 433) is reported to be brightening. It reached
14.2 - 14.4mag on November 5 (vsnet-campaign-xray 163).
SN 2002hm (RA = 11h58m29s.58, Dec = +27d31'45".1)
NGC 4016, a host galaxy of SN 2002hm, is a open barred-spiral or
an irregular galaxy. The ESO team (spectrum taken on Nov. 6.19) has
revealed that it is type II SN about a month after maximum
(vsnet-campaign-sn 496).
SN 2002hn (RA = 08h10m14s.95, Dec = +33d57'19".4)
NGC 2532, a host galaxy of SN 2002hn, is a face-on open spiral
galaxy. It also produced SN IIn 1999gb, caught at mag about 15.9
(as bright as SN Ia). The UCB team (spectrum taken with Lick 3-m on
Nov. 6) revealed that SN 2002hn is type Ic SN within a week of
maximum light (vsnet-campaign-sn 496).
SN 2002ho (RA = 12h15m17s.97, Dec = +65d58'55".1)
NGC 4210, a host galaxy of SN 2002ho, is a barred-spiral galaxy.
The SN is superimposed on the southern arm. Typical SN Ia in this
galaxy would have a maximum of mag about 14.5, but it seems not the
case for this SN (vsnet-campaign-sn 498). It turned out to be type
Ic SN within a few weeks after maximum (vsnet-campaign-sn 502).
SN 2002hu (RA = 02h18m20s.06, Dec = +37d27'58".8)
MCG +06-6-12 = KUG 0215+372, a host galaxy of SN 2002hu, is a
small spiral galaxy with ultraviolet excess (vsnet-campaign-sn
498). The CfA team (with Mt. Hopkins 1.5-m on Nov. 8.80) and the
UCB team (with Keck I 10-m on Nov. 9) revealed that it is of SN Ia a
few days before maximum. The recession velocity of the host galay
is about 11000 km/s, so the discovery magnitude is roughly
consistent with the expected maximum brightness (vsnet-campaign-sn
500).
SN 2002hv (RA = 09h22m10s.91, Dec = +33d50'10".8)
UGC 4974, a host galaxy of SN 2002hv, is a lenticular galaxy
making a pair with KUG 0919+340. Such early galaxies produce
SN Ia only, whose expected maximum is mag about 16.5
(vsnet-campaign-sn 498). The CfA team and the UCB team revealed
that it is indeed SN Ia some weeks after maximum
(vsnet-campaign-sn 500).
V2209 Cyg (RA = 21h44m03s.64, Dec = +44d39'02".6)
M. Moriyama reported on November 4 that V2209 Cyg = Var66 Cyg may
be in outburst (15.5C mag). This dwarf nova was discovered by
Antipin. Antipin reported that two types of outbursts (long and
short) exist. The duration of short outbursts as 6 d, suggesting
that the object is an SS Cyg-type dwarf nova, rather than an SU
UMa-type dwarf nova. Nevertheless, further confirmatory and
follow-up observations would be meaningful (vsnet-campaign-dn 3008).
SN 2002hw (RA = 00h06m49s.06, Dec = +08d37'48".5)
UGC 52, a host galaxy of SN 2002hw is a spiral galaxy. The
expected maximum for typical SN Ia is mag about 16.2
(vsnet-campaign-sn 501).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
A bright outburst (13.4mag) was reported by R. Stubbings on
November 10 (vsnet-campaign-dn 3018).
AT Cnc (RA = 08h28m36s.92, Dec = +25d20'02".6)
Reported observations imply that AT Cnc entered a standstill
(vsnet-campaign-dn 3019).
(continuous targets)
AW Sge (RA = 19h58m37s.11, Dec = +16d41'28".7)
The object was clearly detected in outburst on Nov. 1 data by
K. Tanabe (vsnet-campaign-dn 2980). No major rebrightening was
observed (vsnet-campaign-dn 2975).
SN 2002fh (RA = 00h57m47s.74, Dec = -27d30'21".5)
Spectrum taken with the Lick 3-m telescope by The UCB team on
Nov. 2 showed that it is of type Ic within a week past maximum
(vsnet-campaign-sn 493).
SN 2002gx (RA = 02h31m44s.69, Dec = +40d16'39".5)
The UCB team (with Keck I 10-m) has revealed that it is SN Ia
about 2 months after maximum on Nov. 8. The recession velocity of
the host galaxy is about 24000 km/s (vsnet-campaign-sn 500).
PU Per (RA = 02h42m16s.1, Dec = 35d40'46")
The object has faded. The outburst was a normal one
(vsnet-campaign-dn 2976, 2979).
SN 2002hk (RA = 07h07m14s.05, Dec = +44d48'46".2)
According to IAUC 8010, the UCB team revealed (spectrum taken with
Keck II 10-m on Nov. 6) that it is of type II SN with some
peculiarity (vsnet-campaign-sn 497).
SN 2002hj (RA = 02h58m09s.34, Dec = +04d41'03".8)
The UCB team (with Keck II 10-m) revealed that it is type II SN.
The recession velocity is measured as 7090 km/s (vsnet-campaign-sn
495).
SN 2002hg (RA = 10h37m10s.60, Dec = +12d39'13".2)
The UCB team (with Keck II 10-m on Nov. 1.6) and the ESO team
(with Calar Alto 2.2-m on Nov. 2.22) reported that SN 2002hg is a
typical type II SN after maximum light (vsnet-campaign-sn 493).
SN 2002hh (RA = 20h34m44s.29, Dec = +60d07'19".0)
Spectra taken by The UCB team revealed that SN 2002hh is a very
young and highly reddened type II SN (vsnet-campaign-sn 493).
V344 Ori (RA = 06h15m18.94, Dec = +15d30'59".9)
The object faded from the bright outburst (vsnet-campaign-dn 2982,
2991, 3012).
DM Lyr (RA = 18h58m45s.02, Dec = +30d15'39".9)
In the light curve taken on Noveber 1 by K. Torii, there was no
prominent superhumps (vsnet-campaign-dn 2983). On Nov. 4, fully
grown superhumps with amplitudes of 0.3-0.4 mag have been observed
(vsnet-campaign-dn 3000). The superoutburst entered a rapid fading
phase on November 10. The present superoutburst has been somewhat
unusual in its short duration (~10 d or slightly less)
(vsnet-campaign-dn 2972, 2996, 3003, 3013).
CW Mon (RA = 06h36m54s.5, Dec = +00d02'16")
An eclipse-like fading (depth 0.2 mag in V, duration ~40 min) was
clearly recorded in Nov. 3 long observation by S. Kiyota. Although
the feature became less sharp, a similar fading was observed on
Nov. 4. These observations, together with the suggested large
inclination, suggest that these fadings correspond to grazing
eclipses as seen in U Gem (vsnet-campaign-dn 2971). T. Vanmunster
reported some small amplitude (~0.1mag) irregularities in the light
curve on November 5/6 (vsnet-campaign-dn 2987, 2998). S. Kiyota's
data on November 5 showed a further brightening of the object
compared to November 4 (vsnet-campaign-dn 2988). The object still
kept its maximum magnitude on Nov. 6. The light curve on Nov. 6 is
dominated by (rather coherent) QPOs with a time-scale of ~30 min
(vsnet-campaign-dn 2993). The object started fading on November 9.
At this time, shallow (~0.05 mag) eclipses seem to have appeared
again. The QPO-like variations have become milder
(vsnet-campaign-dn 2973, 2985, 2994, 3004, 3010, 3016, 3017).
V4744 Sgr = Nova in Sgr No. 4 (RA = 17h47m21s.724, Dec = -23d28'22".79)
M. Fujii obtained a spectrum on November 4, in which stronger
H-alpha (FWHM 950 km/s), H-beta emission lines, and stronger P
Cyg-type profile of the Na D line were seen. The spectrum clearly
shows Fe II series emission, indicating that the object is most
likely an Fe II-class nova caught in an early stage of its evolution
(vsnet-campaign-nova 1143). This nova has almost remained at the
bright state, which implies a slow nova (vsnet-campaign-nova 1140).
SN 2002gz (RA = 02h34m10s.36, Dec = -00d53'18".2)
It is a SN with a blue continuum and very broad undulations, but
the classification is uncertain. It can be of type IIb because of
possible H-alpha emission and He I absorption. The recession
velocity is measured as about 25000 km/s (vsnet-campaign-sn 502).
SW UMa (RA = 08h36m42s.80, Dec = +53d28'38".2)
Secondary superhumps appeared on Nov. 1 (vsnet-campaign-dn 2984).
On November 3, the amplitude of the superhumps once reached a
minimum (vsnet-campaign-dn 2999). On Nov. 4, the superhumps had
double maxima with complex substructures. There was an indication
of high-amplitude QPOs of ~5 min (vsnet-campaign-dn 2986, 2999).
The Nov. 5 observation by K. Tanabe and K. Torii clearly showed the
regrowth of the superhumps. The profile showed nightly changes, --
from doubly peaked to sharp triangular shape -- which even looks
like a "miniature WZ Sge" (vsnet-campaign-dn 2990, 2999). On
Nov. 6, the waveform became slightly unstable (vsnet-campaign-dn
2999). The object entered a rapid fading stage from the
superoutburst on November 9 (vsnet-campaign-dn 2974, 2981, 2992,
3001, 3006, 3007, 3014). The data on November 9 taken by K. Tanabe
shows a precipitous fading (1.9 mag/d) and superimposed very complex
variations, some of which can be superhumps and late superhumps,
QPOs (vsnet-campaign-dn 3009).
V4742 Sgr (RA = 18h02m21s.864, Dec = -25d20'32".22)
The object is now gradually fading (vsnet-campaign-nova 1142).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
The object started brightening from a deep minimum
(vsnet-campaign-unknown 123).
Z UMi (RA = 15h02m01s.35, Dec = +83d03'48".7)
The object further faded. It was reported to be 13.4-13.6mag on
November 9 (vsnet-campaign-rcb 83, 84, 85).
V4743 Sgr (RA = 19h01m09s.38, Dec = -22d00'06".2)
The object keeps smooth fading (vsnet-campaign-nova 1141).
BL Lac (RA = 22h02m42s.86, Dec = +42d16'37".6)
The object remained active (vsnet-campaign-blazar 284, 285).
OJ287 (RA = 08h51m57s, Dec = 20d17'59")
An outburst of 14.0mag was observed by H. Itoh on November 9
(vsnet-campaign-blazar 286).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object is now brightening. H. Itoh reported it to be 13.6mag
on November 9 (vsnet-campaign-nl 98).
*** Future schedule ***
MINE OBSERVATIONS OF CYG X-1
F. Mirabel announced that the INTEGRAL satellite will point to
Cygnus X-1 for 1 million seconds between November 24 and December
6. In the context of the "MINE" collaboration
(http://elbereth.obspm.fr/~fuchs/mine.html), monitoring programs are
recommended for this period.
[vsnet-campaign-xray 166]
For further information, please, be in contact with Yael Fuchs
(yfuchs@discovery.saclay.cea.fr).
IAU Colloquium 194
"Compact Binaries in the Galaxy and Beyond"
17-22 November 2003, La Paz, Mexico
Contact Details
Web page: http://bufadora.astrosen.unam.mx/~iau194
Email: iau194@astrosen.unam.mx
[vsnet-campaign-sn 467]
[vsnet-campaign-xray 154]
Texas in Tuscany
XXI Symposium on Relativistic Astrophysics
Florence, Italy, December 9-13, 2002
For more information:
http://vsnet.arcetri.astro.it/~texaflor/
[vsnet-campaign-xray 142]
SUPERNOVAE (10 YEARS OF SN1993J)
22-26 April 2003, Valencia, Spain
Web site: http://vsnet.uv.es/2003supernovae/
[vsnet-campaign-sn 342]
[vsnet-campaign-sn 452]
*** General information ***
SN 2002hh
The discovery image:
http://astron.berkeley.edu/~bait/2002/sn2002hh.gif
[vsnet-campaign-sn 493]
V4744 Sgr
Spectrum on November 4 by M. Fujii:
http://vsnet1.harenet.ne.jp/~aikow/v4744sgr_20021104.gif
[vsnet-campaign-nova 1143]
RX J2309.8+2135
Preprint by T. Kato et al.:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/J2309/
[vsnet-campaign-dn 2989]
CW Mon
Time-series observations by T. Vanmunster:
http://vsnet.cbabelgium.com
[vsnet-campaign-dn 2997]
V838 Mon
B,V,and Rc images taken by D. West:
http://members.aol.com/dwest61506/page37.html
[vsnet-campaign-nova 1144]
[vsnet-campaign-v838mon 400]
and combined image provided by B. Hassforther:
http://vsnet.bela1996.de/astronomy/mon-v838.html
[vsnet-campaign-v838mon 401]
z'-band image taken by A. Henden
http://ftp.nofs.navy.mil/pub/outgoing/aah/temp/v838monz.jpg
[vsnet-campaign-v838mon 402]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page