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*** News from VSNET ***
NSV 09923 is now in a superoutburst. Superhumps with period about
0.82 day were discovered during the 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 June 30, 2003, as VSNET campaign
circulation 1401
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
NSV 09923 (RA = 17h59m17s.1, Dec = -42d35'04")
As reported by R. Stubbings in [vsnet-outburst 5689] on June 28,
NSV09923 is now in an outburst (14.0mag). This object was
recognized during the identifications of NSV objects against ROSAT
X-ray source (Kato 2000, vsnet-id-rosat 11). The proximity of the
ROSAT position to the NSV position suggests that the object may be a
dwarf nova (vsnet-campaign-dn 3806). The outburst was
confirmed by B. Monard (vsnet-outburst 5691, vsnet-campaign-dn 3814).
He reported a possible oscillations in the light curve
(vsnet-campaign-dn 3816). Seven hours of unfiltered photometry by
B. Monard showed distinct superhumps. The period was 0.819(4) day.
The hump amplitude was around 0.3 mag. There was also strong
indication of quasi-periodic oscillations (QPOs) with periods of 25
min near the superhump minima (vsnet-campaign-dn 3819).
RX Cha (RA = 10h36m26s.33, Dec = -80d02'48".2)
As reported by R. Stubbings on June 26, the SU UMa-type dwarf nova
RX Cha is undergoing an outburst (14.3mag). The superhump detection
by G. Garradd was reported in IBVS 5117 (2001), but this period
needs to be confirmed by further extensive observations. The last
two outbursts were in 2002 April (superoutburst?) and 2002 December
(normal outburst?) (vsnet-campaign-dn 3803). The outburst appears
to be a superoutburst (vsnet-campaign-dn 3809).
V485 Cen (RA = 12h57m23s.30, Dec = -33d12'06".8)
An outburst (14.4mag) was reported by R. Stubbings on June 23.
The last superoutburst was in 2003 January (vsnet-campaign-dn 3800).
MM Hya (RA = 09h14m13s.97, Dec = -06d47'45".0)
An outburst (13.2mag) was reported by R. Stubbings on June 25
(vsnet-campaign-dn 3802). It appears to be a superoutburst
(vsnet-campaign-dn 3812).
SN 2003gf (RA = 22h13m40s.94, Dec = -21d44'03".3)
SN 2003gf is hosted by MCG -04-52-26, an irregular galaxy. The
expected maximum for typical SN Ia is mag about 14.4
(vsnet-campaign-sn 646). The Las Campanas spectrum taken on June
25.31 UT showed that it was type Ic SN a few weeks after maximum
(vsnet-campaign-sn 647).
SN 2003gg (RA = 20h28m10s.68, Dec = -18d17'32".4)
SN 2003gg is hosted by IC 1321, a barred-spiral galaxy. The
expected maximum for typical SN Ia is mag about 16.6
(vsnet-campaign-sn 648). The UCB team reported that it is a type II
SN, 1-2 months after the explosion (vsnet-campaign-sn 649).
(continuous targets)
Variable (possible nova?) in LMC 2003
(RA = 05h08m25s.71, Dec = -68d26'23".3)
W. Liller reported that the object may be getting bluer
(vsnet-campaign-nova 1317). Accurate astrometry and spectroscopic
observations are encouraged (vsnet-campaign-nova 1294, 1295, 1296,
1304, 1305, 1310, 1311, 1314, 1316, 1318).
NGC6822nova2003 (RA = 19h45m04s.18, Dec = -14d45'46".5)
The UCB team reported that it is a very late M-type star (red
supergiant) in NGC 6822 (vsnet-campaign-sn 649). This object is
probably identical with NGC6822V20 (vsnet-campaign-sn 650).
SN2003-UGC10700 (RA = 17h06m06s.12, Dec = +25d51'53".3)
The UCB team reported that this object is a Galactic cataclysmic
variable (vsnet-campaign-sn 649, 651, vsnet-campaign-dn 3817, 3820).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The object is reported to be brightening again (vsnet-campaign-be 243).
V4745 Sgr (RA = 18h40m02s.54, Dec = -33d26'55".1)
V4745 Sgr has stared its 3-d major re-brightening since its
nova-outburst on Apr 10 (vsnet-campaign-nova 1297, 1298, 1307, 1312,
1313, 1315). G. Pojmanski reported that low amplitude (0.02-0.05)
modulation with period ~0.2 was clearly visible on the rising branch
(vsnet-campaign-nova 1307, 1308, 1309).
V699 Oph (RA = 16h25m14s.8, Dec = -04d40'25")
The data from D. Starkey and T. Krajci indicated a smooth fading.
According to Ktajci's data, the object faded by 0.6 mag in 1 day
(vsnet-campaign-dn 3799). A rebrightening was reported on June 25,
but not confirmed (vsnet-campaign-dn 3801, 3805).
SN 2003ds (RA = 10h18m58s.35, Dec = +46d27'15".5)
The UCB team reported that this object is type Ic SN
(vsnet-campaign-sn 649).
KK Tel (RA = 20h28m38s.46, Dec = -52d18'45".6)
The light curve taken by T. Richards showed clear presence of
fully developed superhumps with an amplitude of 0.2 mag. The best
superhump period derived from these data is 0.0876(1) d. This
observation has confirmed of the previous detection of the
long-period superhumps. This period is slightly shorter than the
previous determination (vsnet-campaign-dn 3804). The superoutburst
is now ongoing (vsnet-campaign-dn 3810).
SN 2003gd (RA = 01h36m42s.65, Dec = +15d44'19".9)
It was reported to have already bright on June 11
(vsnet-campaign-sn 649).
SN 2003ev (RA = 13h10m31s.80, Dec = -21d39'49".6)
The UCB team reported that it is confirmed to be a type Ic SN
(vsnet-campaign-sn 649).
GO Com (RA = 12h56m37s.0, Dec = +26d36'44")
GO Com, presently in post-superoutburst stage, continues to fade
almost linearly. Such long persistence of post-superoutburst fading
is rather surprising (vsnet-campaign-dn 3808).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
The fading stage from a plateau was reported (vsnet-campaign-dn 3811).
V1494 Aql (RA = 19h23m05s.4, Dec = +04d57'20".1)
Recent observations by D. Starkey and T. Krajci to VSNET detected
eclipses of V1494 Aql (Nova Aql 1999 No. 2). The depths of eclipses
were about 0.4 mag, flat-bottomed and have typical durations of 30
min. The orbital period is 0.1346 d, which is consistent with
previously reported periods (vsnet-campaign-nova 1299, 1301, 1303,
1300, 1302).
IP Peg (RA = 23h23m08s.7, Dec = +18d24'59".1)
An outburst was reported by E. Muyllaert on June 28
(vsnet-campaign-dn 3813).
V Sge (RA = 20h20m14s.75, Dec = +21d06'09".0)
The faint state continues (vsnet-campaign-nl 131).
SN 2003fd (RA = 13h41m43s.70, Dec = +40d52'38".5)
It is turned out to be a type Ia SN, about 2 weeks after the
maximum light. So, the discovery is made when it was near the
maximum (vsnet-campaign-sn 649).
*** 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 ***
Variable (possible nova?) in LMC 2003
VSNET page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Novae/nlmc2003.html
[vsnet-campaign-nova 1306]
Colour - colour and exotic variables
see, [vsnet-campaign-orion 43], or:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/others/JG/
[vsnet-campaign-orion 43]
IP Peg
Eclipse ephemeris, see [vsnet-campaign-dn 3807]
NSV 09923
Image from Berto Monard
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/NSV09923/mon1.gif
[vsnet-campaign-dn 3815]
rho Cas
Low resolution spectrum by D. West:
http://members.aol.com/dwest61506/page74.html
[vsnet-campaign-rhocas 21]
[vsnet-campaign-mira 68]
Call for papers -- PASJ special edition on VSNET
see, [vsnet-campaign 1400]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
