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*** News from VSNET ***
The SU UMa-type dwarf nova 1RXP J113123+4322.5 is now in
superoutburst, showing the period increase of superhumps.
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 March 17, 2003, as VSNET campaign
circulation 1376
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
1RXP J113123+4322.5 (RA = 11h31m22s.426, Dec = +43d22'38".51)
P. Schmeer reported an outburst (12.9mag) of this SU UMa-type
dwarf nova on March 13 (vsnet-campaign-dn 3533, 3535, 3536). The
Kyoto observation on March 13 revealed the presence of superhumps
(amplitude 0.22 mag). The outburst was thus confirmed to be a
genuine superoutburst. The object may have been on its final rising
stage. The superhump period based on this single night observation
is 0.0643(4) d, which may be slightly shorter than the one (0.06495
d) obtained in 2002 (vsnet-campaign-dn 3540). Combined with light
curves on March 14, superhumps showed a slightly decrease of
amplitude and a refined period of 0.06487(5) d (vsnet-campaign-dn
3541). T. Kato reported on March 17 that the superhump period
increased to 0.06499(1) d (vsnet-campaign-dn 3545, 3546). The
superoutburst continues (vsnet-campaign-dn 3543).
SN 2003bt (RA = 10h55m22s.48, Dec = -07d39'12".3)
SN 2003bt is hosted by MCG -01-28-006, a face-on barred-spiral
galaxy. The new object is superimposed on the western arm. The
expected maximum for typical SN Ia is consistent with the discovery
magnitude (16.7mag)(vsnet-campaign-sn 578). The CfA team revealed
that it was a type Ia SN about 2 weeks after maximum on Mar. 11.25
(vsnet-campaign-sn 580).
BR Lup (RA = 15h35m51s.61, Dec = -40d34'25".4)
R. Stubbings reported that BR Lup was in outburst (14.4mag) on
March 10 (vsnet-campaign-dn 3528).
V1333 Aql (RA = 19h11m16s.09, Dec = +00d35'06".0)
S. A. Ilovaisky et al. reported that V1333 Aql = Aql X-1 was very
bright at a maximum brightness V=16.2 on March 4-10. This is
typical of the maximum levels reached during the large 1995 and 1998
outbursts (vsnet-campaign-xray 199).
V568 Cyg (RA = 20h42m22s.3, Dec = +35d27'22")
According to Y. Watanabe, the Be-star V568 Cyg is gradually
brightening (vsnet-campaign-be 226).
SN 2003bu (RA = 14h00m31s.45, Dec = -28d52'32".7)
SN 2003bu is hosted by NGC 5393, a face-on barred spiral galaxy
with ring structure. The SN is superimposed on the west end of
the bar. The expected maximum for typical SN Ia is mag about 16.3
(vsnet-campaign-sn 581).
4U 1608-522 = QX Nor (RA = 16h12m42s.6, Dec = -52d25'21")
According to ATEL #126 (Miller et al.), this X-ray transient
(neutron star transient) is in outburst, based on RXTE/ASM
observations (vsnet-campaign-xray 200).
SN 2003bv (RA = 07h22m11s.92, Dec = +40d28'01".5)
SN 2003bv is hosted by MCG +07-15-15, a barred-spiral galaxy with
a ring structure. The expected maximum (derived from NED
recession velocity) of typical SN Ia is well below (more than 1
mag) of the reported magnitude on Mar. 13.918 (16.8mag), so the
timely follow-up observations (spectroscopy, photometry) are
extremely encouraged (vsnet-campaign-sn 582).
SN 2003bw (RA = 14h57m22s.44, Dec = -19d12'45".9)
SN 2003bw is hosted by IC 1077, a face-on spiral galaxy. The new
object is superimposed on the western arm. The expected maximum
of typical SN Ia is mag about 15.2, though it seems not a case
(vsnet-campaign-sn 583).
SN 2003cb (RA = 13h00m33s.25, Dec = -06d51'09".3)
SN 2003cb is hosted by NGC 4885, apparently disk type galaxy. The
expected maximum for typical SN Ia is mag about 15.0, though it
seems not to of this case (vsnet-campaign-sn 584).
(continuous targets)
V982 Oph (RA = 17h52m37s.86, Dec = +07d33'04".4)
The outburst was confirmed by K. Torii on March 11
(vsnet-campaign-dn 3530). T. Kato reported that the light curve on
March 11 seems to suggest the presence of ~0.2 mag variation, which
looks like superhumps with a period of ~0.075 d. There was no
rapidly fading trend. Owing to the short visibility and the
faintness of the object, the identification of this period is not
yet clear (vsnet-campaign-dn 3537). M. Linnolt reported that it was
fainter than 15.4 mag on March 12 (vsnet-campaign-dn 3532).
AH Her (RA = 16h44m09s.99, Dec = +25d15'02".1)
A possible weak outburst can be seen around March 1-3 during the
standstill (vsnet-campaign-dn 3529).
SN 2003bm (RA = 08h07m22s.87, Dec = +40d23'44".3)
A spectrum taken on Mar. 7 by the CfA team revealed that it is
type Ic supernova (vsnet-campaign-sn 579).
DM Dra (RA = 15h34m12s.13, Dec = +59d48'31".9)
Based on March 7-13 data, the best period of superhumps has been
determined to be 0.07567(2) d (vsnet-campaign-dn 3531, 3534, 3542).
Secondary superhump maxima sometimes appeared on March 10
(vsnet-campaign-dn 3534). The amplitude of the superhumps seems to
have quickly decayed during the observation on March 11. On March
13, the full amplitude is reduced to 0.1 mag (vsnet-campaign-dn
3542). The superoutburst continues (vsnet-campaign-dn 3544).
V603 Aql (RA = 18h48m54s.6, Dec = +00d35'03")
Based on D. West's observations, T. Kato reported that the object
looks indeed systematically fainter than the past years, even taking
the slow general fading since the nova outburst into account
(vsnet-campaign-nova 1171, 1172).
SN 2003bp (RA = 08h27m27s.81, Dec = +17d17'14".5)
A spectrum taken on Mar. 10 by the CfA team revealed that it is
type Ib supernova, but the He line is weaker than normal SN Ib.
They suggest that it would be a transitional object between SN Ib
and Ic (vsnet-campaign-sn 579). The LBNL team also report that a
spectrum taken on Mar 8.22 shows it to be an early SN Ib with
somewhat weaker He lines (vsnet-campaign-sn 580).
SN 2003br (RA = 14h34m34s.98, Dec = -27d59'48".8)
A spectrum taken on Mar 11.47 by the CfA team revealed that it is
a type II SN (vsnet-campaign-sn 580).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
D. West reported a deep fading (>15.3V) of MisV1147 on March 15
(vsnet-campaign-unknown 195).
AM Her (RA = 18h16m13s.4, Dec = +49d52'03".1)
The brightening may have stopped (vsnet-campaign-polar 23).
R CrB (RA = 15h48m34s.40, Dec = +28d09'23".7)
After the object reached at minimum, it may start recovering
(vsnet-campaign-rcb 111, 112, 113, 114, 115, 116, 117, 118).
V2540 Oph (RA = 17h37m34s.36, Dec = -16d23'18".4)
D. West reported that V2540 Oph is gradually getting bluer, but
T. Kato commented that it is because the contribution from H_alpha
emission line has reduced (vsnet-campaign-nova 1169, 1170).
*** Future schedule ***
The 3rd International Workshop for
Comprehensive Study of the High Energy Universe
- Toward Very High Energy Particle Astronomy -
Date: Mar. 20-22, 2003
Location: ICRR, Univ. of Tokyo, Kashiwa, Japan
web site: http://taws300.icrr.u-tokyo.ac.jp/workshop2003/
[vsnet-campaign-blazar 297]
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]
[vsnet-campaign-xray 172]
Light curve provided by S. Otero:
http://ar.geocities.com/varsao/Curva_Eta_Carinae.htm
[vsnet-campaign-sdor 22]
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]
WEBT campaign on Mkn 421
M. Villata announced possible WEBT campaign on Mkn 421, in
December 2002 and February-March 2003, to be carried out during
multifrequency campaigns.
The relevant information on the MW campaign of December 2-16 is at
the VERITAS site <http://veritas.sao.arizona.edu> .
[vsnet-campaign-blazar 287]
[vsnet-campaign-blazar 288]
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]
[vsnet-campaign-sn 512]
*** General information ***
V982 Oph
CCD image taken by K. Torii:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/V982_Oph/torii1.gif
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/v982oph.html
[vsnet-campaign-dn 3530]
GRB 021004
Preprint by M. Uemura et al.
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/GRB/grb021004.html
[vsnet-campaign-grb 14]
1RXP J113123+4322.5
VSNET page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/j1131.html
[vsnet-campaign-dn 3536]
Superhump profile:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/J1131/j1131-0313.gif
[vsnet-campaign-dn 3540]
Needs More Observations (NMO) Campaign:
http://vsnet.aavso.org/bulletin/
[vsnet-campaign-mira 51, 52]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
