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*** News from VSNET ***
A new mysterious variable was reported by W. Liller in LMC.
Tha nature of this object is still unknown.
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 June 23, 2003, as VSNET campaign
circulation 1399
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
Variable (possible nova?) in LMC 2003
(RA = 05h08.4m, Dec = -68d26')
W. Liller reported his discovery of a possible nova in LMC on
images taken on June 17. The object was recorded at 11.0mag, and no
bright object was seen on his images taken on June 2
(vsnet-campaign-nova 1280). B. Monard confirmed the bright object
at 11.4CR mag on June 20, and reported a possible quiescent
counterpart (r=14.6, b=16.9, USNO A2.0)(vsnet-campaign-nova 1281).
Based on its infrared colors, B. Skiff reported that it may be a
G-supergiant in LMC, now showing a something unusual brightening
(vsnet-campaign-nova 1282, 1285, 1286, 1287, 1288). The ASAS3
observations show that it may be a variable of V=13.95 to 14.6, but
no large outburst has been recorded (vsnet-campaign-nova 1284,
1283). A. Pearce performed astrometry, and reported the above
position of the object (vsnet-campaign-nova 1289). W. Liller
performed multi-color photometry, and reported that it is too red to
be a nova (vsnet-campaign-nova 1291). M. Friedjung commented that
the color of the object is too red to be interpreted by a brightening
symbiotic binary (vsnet-campaign-nova 1293). The object is
gradually fading (vsnet-campaign-nova 1292).
SN2003-UGC10700 (RA = 17h06m06s.12, Dec = +25d51'53".3)
A new object was found in UGC 10700 on KAIT images taken on June
17 at about 16.5mag. UGC 10700 is an apparent spiral galaxy, nearly
edge on. The recession velocity of the galaxy is not entried in
the NED, but the apparent size of it suggests that the new object is
somewhat far as the associated object to the galaxy
(vsnet-campaign-dn 3793, vsnet-campaign-sn 644).
KV Dra (RA = 14h50m38.4s, Dec = +64d03m29s)
According to E. Muyllaert, the SU UMa-type dwarf nova KV Dra is in
outburst. Although the reported magnitude (14.3mag) is fainter than
those of past superoutbursts, the object may deserve further
observations because of its unusual outburst properties. The last
superoutburst was in 2002 September (vsnet-campaign-dn 3795).
SN 2003ge (RA = 16h20m08s.75, Dec = +37d47'53".7)
SN 2003ge is hosted by NGC 6122, apparently spiral galaxy. The
expected maximum for typical SN Ia is around mag 17
(vsnet-campaign-sn 645).
V699 Oph (RA = 16h25m14s.8, Dec = -04d40'25")
M. Simonsen reported an outburst (14.4-14.5mag) of V699 Oph on
June 22. The 2000 January outburst faded rather rapidly, as in a
normal outburst of an SU UMa-type dwarf nova. The 1999 April
outburst (reaching mv=13.9) looked like a superoutburst
(vsnet-campaign-dn 3796). The data observed by T. Krajci on June 22
indicate that the object was rather rapidly fading at a rate of 0.7
mag/d. Although this may suggest that the outburst would be a
normal outburst, the outburst may also be precursor outburst
(vsnet-campaign-dn 3798).
KK Tel (RA = 20h28m38s.46, Dec = -52d18'45".6)
As reported by R. Stubbings on June 22, the SU UMa-type dwarf
nova, KK Tel is undergoing an outburst, whose brightness and
outburst interval suggest a superoutburst. KK Tel is known as a
long-period SU UMa star with an unusual superhump period change
(vsnet-campaign-dn 3797).
(continuous targets)
SN 2003gd (RA = 01h36m42s.65, Dec = +15d44'19".9)
Optical spectra taken by W. Herschel Telescope and Baade telescope
on June 14 indicate that it was really a type II SN about 1-2
month after explosion. The archived images taken by HST and Gemini
North show the probable progenitor of SN 2003gd. Its magnitudes
are: V=26.1 +/- 0.15, I ~23.8, which suggest that it is a red
(spectral type M) supergiant (M_V = -3.5, log L/Lsun ~ 4). It seems
to be a relatively low mass star (about 8-10 M_sun)
(vsnet-campaign-sn 642, 640, 641, 643).
GO Com (RA = 12h56m37s.0, Dec = +26d36'44")
The object faded only by 0.3 mag in one day as shown by
T. Krajci's observation on June 16. There was a considerable
degree of variations, which may be related to late superhumps, but
were not very strictly periodic (vsnet-campaign-dn 3788). In a
global sense, GO Com was linearly fading in its post-superoutburst
state during the last week. The mean fading rate was comparable to
the mean fading rate during the superoutburst plateau phase
(vsnet-campaign-dn 3790, 3792). D. Starkey's data on June 20
indicate that the post-superoutburst fading has apparently stopped.
It rather indicates a brightening, although it may be some sort of a
hump feature (vsnet-campaign-dn 3794).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
Observations by B. Monard revealed a brighter outburst (compared
to the linear fading trend) on June 14-15. The short-period
oscillations (continuing superhumps) were present throughout this
period, but with a reduced amplitude. Following this outburst,
there was a smaller outburst on June 16 (vsnet-campaign-dn 3791).
In the light curve on June 16 by T. Richards, the star was observed
in its brightening phase and around maximum. After reaching the
maximum, the object started to fade immediately. This short
duration of the maximum plateau phase is another characteristic of
this helium dwarf nova (vsnet-campaign-dn 3787). The superoutburst
continues (vsnet-campaign-dn 3789).
V1494 Aql (RA = 19h23m05s.4, Dec = +04d57'20".1)
D. Starkey's observation of V1494 Aql in [vsnet-obs 45541]
apparently signifies the presence of a 0.3-0.4 mag eclipse
(vsnet-campaign-nova 1290).
*** Future schedule ***
Multiwavelength AGN Surveys
a "Guillermo Haro" Astrophysics Conference
organized by INAOE
December 8-12, 2003
Cozumel, Mexico
http://vsnet.inaoep.mx/~agn2003/
[vsnet-campaign-agn 4]
IM Nor Campaign
by I. Hachisu (University of Tokyo) and the VSNET team
For more information, see [vsnet-campaign-nova 1241]
GRB Mini-Symposium in JENAM2003
For more information, http://vsnet.konkoly.hu/jenam03/
[vsnet-campaign-grb 31]
IAU JD17 "ATOMIC DATA FOR X-RAY ASTRONOMY"
ON JULY 22-23, 2003 at the XXVth IAU GENERAL ASSEMBLY
SYDNEY, AUSTRALIA, JULY 13-26, 2003
for more information:
http://vsnet.astronomy.ohio-state.edu/~pradhan/Iau/iau.html
[vsnet-campaign-xray 227]
"X-ray and Radio Emission of Young Stars"
July 28 - 29, 2003, Rikkyo University, Tokyo, Japan
for more information , please contact to kitamoto@rikkyo.ne.jp
[vsnet-campaign-xray 218]
Conference: THE INTERPLAY AMONG BLACK HOLES, STARS AND ISM IN
GALACTIC NUCLEI
in Gramado, south of Brasil, March 1-5, 2004
for more information, please contact to BHSIGN@if.ufrgs.br
[vsnet-campaign-agn 3]
eta Car: The next "shell event"/X-ray eclipse
M. Corcoran reported the event will occur this summer.
Coordinated ground-based observations of eta car along with the
X-ray observations would be really important.
For more information:
Latest X-ray light curve:
http://lheawww.gsfc.nasa.gov/users/corcoran/eta_car/etacar_rxte_lightcurve/
[vsnet-campaign-sdor 23, 24,
25, 26, 28, 29, 46]
[vsnet-campaign-xray 172]
Light curve provided by S. Otero:
http://ar.geocities.com/varsao/Curva_Eta_Carinae.htm
[vsnet-campaign-sdor 22, 32, 33]
The 2003 Gamma Ray Burst conference
Hosted by Los Alamos,
in Santa Fe, New Mexico (USA), between September 8 and 12, 2003
http://grb2003.lanl.gov/
[vsnet-campaign-grb 13]
*** General information ***
GRB030329
Preprint by Uemura et al. see astro-ph/0306396
[vsnet-campaign-grb 32]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
