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*** News from VSNET ***
The nova nature of a variable in LMC was confirmed.
V699 Oph experienced a rebrightening, and entered a 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 July 6, 2003, as VSNET campaign
circulation 1403
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V1141 Aql (RA = 19h37m10s.01, Dec = +02d35'59".2)
An outburst of the SU UMa-type dwarf nova V1141 Aql was detected
by D. Taylor and R. Stubbings on July 1. The last confirmed
superoutburst was in 2002 July. The mean superhump period was
reported to be 0.05930 d (relatively short Psh system resembling SW
UMa) (vsnet-campaign-dn 3822). D. Nogami confirmed the outburst
(vsnet-campaign-dn 3827), and detected fully developed superhumps
with an amplitude of ~0.35 mag (vsnet-campaign-dn 3828,
vsnet-campaign 1402). During the first night, the superhump period
was appreciably longer (0.062 d), and then stabilized to a shorter
period (mean period 0.05942 d). The evolution of the superhump
period looked like rather discontinuous (vsnet-campaign-dn 3842).
The superoutburst is now ongoing (vsnet-campaign-dn 3829).
DM Lyr (RA = 18h58m45s.02, Dec = +30d15'39".9)
As reported by C. Gualdoni on July 4, the SU UMa-type dwarf nova
DM Lyr is undergoing an outburst. There has been a report that this
star is recently displaying an anomalous outburst pattern
(vsnet-campaign-dn 3848).
V1363 Cyg (RA = 20h06m11s.58, Dec = +33d42'37".7)
This unusual CV is reported to be active recently
(vsnet-campaign-dn 3849).
SN 2003gh (RA = 07h45m17s.93, Dec = -71d24'37".3)
SN 2003gh is hosted by NGC 2466, a face-on spiral galaxy. The
magnitude at discovery (15.6-15.7mag) is consistent with (or
slightly brighter than) the expected maximum of typical SN Ia.
Additionally, on the DSS I-band image (taken on 1989 Dec. 17), the
central region of NGC 2466 appeared to elongated to the east, as if
an apparent supernova existed at the position end figures 16s.73,
38".0. This region is overexposed on the DSS images on other bands,
so it is not certain that it is a transient or a permanent
(vsnet-campaign-sn 652).
SN 2003gi (RA = 00h38m32s.67, Dec = -24d20'33".5)
SN 2003gi is hosted by IC 1561, a barred-spiral galaxy which is a
member of a IC 1562 group = KTS 05. The expected maximum for
typical SN Ia is mag about 15.3 (vsnet-campaign-sn 653).
SN 2003gj (RA = 21h07m19s.18, Dec = -25d29'23".6)
SN 2003gj is hosted by NGC 7017, an interacting pair galaxy near
the center of the cluster ABELL 3744. The discovery magnitude
(17.7-17.6mag) is consistent with the expected maximum for typical
SN Ia (vsnet-campaign-sn 653).
SN 2003gk (RA = 23h01m42s.99, Dec = +02d16'08".7)
SN 2003gk is hosted by NGC 7460, an apparently disturbed
barred-spiral galaxy. The expected maximum of typical SN Ia is mag
about 15.0 (vsnet-campaign-sn 654).
GT Ori (RA = 05h43m29s.2, Dec = +00d04'59")
Based on observations by ASAS-3, J. Greaves proposed that GT Ori
may be some sort of YSO, specifically the sort prone to occasional
eclipse-like dips in magnitude (vsnet-campaign-orion 44).
T. Watanabe (VSOLJ) obtained extensive observations during the last
(nearly a) decade. T. Kato reported that the light curve is
consistent with a "fader"-type YSO, but would be also consistent
with an SRD star with sharp minima (vsnet-campaign-orion 45, and
also see articles on V351 Ori in vsnet-campaign-orion 46, 47, 48).
(continuous targets)
NSV 09923 (RA = 17h59m17s.1, Dec = -42d35'04")
The light curve on July 1-2 is dominated with relatively
long-period QPOs; there are seen as wiggles on the superhump profile
(vsnet-campaign-dn 3823). The superhump amplitude slightly
decreased on July 3. T. Kato reported a refined superhump period of
0.08235(2) d on July 4 (vsnet-campaign-dn 3836, 3821). I. Andronov
reported a superhump period of 0.08341(8) d (vsnet-campaign-dn 3844,
3845). The superoutburst is now ongoing (vsnet-campaign-dn 3824,
3830, 3834, 3837).
RX Cha (RA = 10h36m26s.33, Dec = -80d02'48".2)
The superoutburst continues (vsnet-campaign-dn 3826, 3831).
V589 Her (RA = 16h22m07s.19, Dec = +19d22'36".3)
As reported by C. Gualdoni and P. Schmeer on July 4 and 5, the
suspected SU UMa-type dwarf nova V589 Her is undergoing an outburst.
Although there has been a claim of superhump detection, this needs
to be confirmed by more systematic observations (vsnet-campaign-dn 3847).
Nova in LMC 2003 (=Variable (possible nova?) in LMC 2003)
(RA = 05h08m25s.71, Dec = -68d26'23".3)
H. Bond performed spectroscopic observation at Cerro Tololo, and
reported very broad Balmer emission lines, which revealed the nova
nature of this variable (vsnet-campaign-nova 1319, 1320). The
object is now gradually fading (vsnet-campaign-nova 1321).
V699 Oph (RA = 16h25m14s.8, Dec = -04d40'25")
A rebrightening was reported by R. Stubbings on July 3
(vsnet-campaign-dn 3832). T. Krajci confirmed the rebrightening,
and detected 0.25-mag superhumps. This finally confirmed the
long-suspected SU UMa-type nature of this dwarf nova
(vsnet-campaign-dn 3835). From the combined data set, T. Kato
reported a refined meansuperhump period of 0.07009(8) d on July 6
(vsnet-campaign-dn 3846, 3839). With the superhump period, there
seems to be a weak (about 0.05 mag) superhump signal during June
22-25 (vsnet-campaign-dn 3841). The superoutburst is now ongoing
(vsnet-campaign-dn 3838).
KK Tel (RA = 20h28m38s.46, Dec = -52d18'45".6)
The object is fading from the superoutburst (vsnet-campaign-dn 3825).
*** Future schedule ***
WEBT Campaign for AO 0235+16 with XMM-Newton
January-February 2004
please contact to Claudia M. Raiteri,
see [vsnet-campaign-blazar 301]
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 ***
V699 Oph
VSNET page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/v699oph.html
[vsnet-campaign-dn 3840]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Powerful Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
