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*** News from VSNET ***
OU Vir is now in a post-superoutburst slowly fading phase.
rho Cas is reported to be active now.
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 May 26, 2003, as VSNET campaign
circulation 1393
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2003ei (RA = 16h28m40s.30, Dec = +12d46'05".8)
SN 2003ei is hosted by UGC 10402, an interacting pair consists of
two disturbed spiral galaxies. The expected maximum of typical SN
Ia is consistent with the reported magnitudes (16.9mag on May 20)
(vsnet-campaign-sn 623). The CfA team revealed that it is of type
IIn (May 21.23 UT spectrum) (vsnet-campaign-sn 624).
V660 Her (RA = 17h42m07s.3, Dec = +23d47'37".3)
An outburst (14.6mag) was reported by M. Simonsen on May 21
(vsnet-campaign-dn 3675). The light curve on May 21 observed by the
Kyoto team showed no prominent superhumps (vsnet-campaign-dn 3676,
3679). A rapid fading was reported, and the outburst seems to be a
normal one (vsnet-campaign-dn 3684, 3685, 3688).
rho Cas (RA = 23h54m22s.99, Dec = +57d29'58".7)
According to AAVSO alert notice No. 301, the hypergiant rho Cas is
reported to show an activity in hydrogen emission line. This
phenomenon may lead to another mass-loss episode, which may lead to
optical fading. The most recent spectacular fading event was
observed in 2000. This object has been reported to be "brighter than
usual" in this year (vsnet-campaign-rhocas 12, 14). A. Lobel performed
high-resolution spectroscopic observations, and reported that the
hypergiant has increased spectral activity (vsnet-campaign-rhocas 13).
SN 2003ej (RA = 12h39m11s.10, Dec = +00d43'30".4)
SN 2003ej is hosted by UGC 7820, a face-on spiral galaxy. The
expected maximum for typical SN Ia is mag about 15.9
(vsnet-campaign-sn 624). It turned out to be a young type II SN by
the spectroscopy by the CfA team on May 22 (vsnet-campaign-sn 626).
SN 2003ek (RA = 17h18m32s.50, Dec = +41d40'00".8)
SN 2003ek is hosted by FGC 2126, an edge-on spiral galaxy. It
lies between a lenticular galaxy NGC 6350 and a spiral galaxy NGC
6348. The relation between the magnitudes and the recession
velocities of these two seems somewhat queer. FGC 2126 itself is
dimmer than these two, and the expected maximum for typical SN Ia is
mag around 17.5 (vsnet-campaign-sn 624). It turned out to be
somewhat reddened SN Ia before maximum (vsnet-campaign-sn 626).
SX LMi (RA = 10h54m29s.93, Dec = +30d06'30".0)
C. Gualdoni reported an outburst (13.4mag) of the SU UMa-type
dwarf nova SX LMi on May 21. The recent behavior of SX LMi has been
rather unusual in that it showed a number of normal outbursts, which
were not very frequently seen in the past (vsnet-campaign-dn 3680).
The object faded to 14.4mag on May 22 (vsnet-campaign-dn 3683).
SN 2003el (RA = 13h09m46s.20, Dec = +28d54'21".6)
SN 2003el is hosted by NGC 5000, a barred-spiral starburst galaxy.
The SN is superimposed on the western end of the bar. The expected
maximum for typical SN Ia is mag about 16.0, though the reported
magnitudes (18.8-18.9 mag) suggest that it would be a
gravitationcal-collapse event (vsnet-campaign-sn 625). The spectrum
by the CfA team taken on May 25 shows that it was type Ic SN near
the maximum light (vsnet-campaign-sn 627).
PU CMa (RA = 06h40m47s.67, Dec = -24d23'14".6)
R. Stubbings reported an outburst of the short-period (candidate)
SU UMa-type dwarf nova PU CMa. It may be a superoutburst
(vsnet-campaign-dn 3687).
V735 Sgr (RA = 17h59m51s.7, Dec = -29d33'50")
R. Stubbings reported a brightening to 13.5mag of this yet poorly
known (formerly considered as a dwarf nova) object on May 24
(vsnet-campaign-unknown 205).
V729 Sgr (RA = 19h16m49s.15, Dec = -26d14'33".2)
As reported by R. Stubbings on May 25, the eclipsing dwarf nova
V729 Sgr is in outburst (13.4mag). This outburst seems to be a
brighter one (vsnet-campaign-dn 3689).
NY Ser (RA = 15h13m02s.39, Dec = +23d15'07".1)
As reported by G. Poyner on May 24, the SU UMa-type dwarf nova NY
Ser (object in the period gap) is in outburst (14.5mag)
(vsnet-campaign-dn 3690).
1502+09 (RA = 15h04m41s.78, Dec = +08d47'54".1)
T. Kato commented that this apparent dwarf nova (quiescent
magnitude V=18.5) has been mostly overlooked since the discovery
in 1985. The expected outbursts will be brighter than V=15. There
is no definite outburst observation in ASAS-3, although there is one
positive measurement (vsnet-campaign-dn 3691).
(continuous targets)
TmzV772 (RA = 12h45m06s.82, Dec = +21d39'33".4)
C. Lloyd reported that there may be an observable but small (0.1)
secondary eclipse (vsnet-campaign-ecl 72).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
A new outburst started on May 21 (vsnet-campaign-dn 3686).
SN 2003eg (RA = 12h50m58s.33, Dec = -14d20'01".1)
The CfA team took a spectrum of SN 2003eg on May 21.21 UT, which
shows that it was type II SN soon after explosion. It is somewhat
luminous event as a gravitational collapse (vsnet-campaign-sn 624).
SN 2003ef (RA = 12h49m42s.25, Dec = -11d05'29".5)
The CfA team has revealed that it was type II SN by a spectrum
taken on May 21.19 UT (vsnet-campaign-sn 624).
SN 2003eh (RA = 11h08m24s.34, Dec = +03d29'47".0)
The CfA team spectrum (May 21.17) revealed that it was a reddened
SN Ia near maximum (vsnet-campaign-sn 624).
TV Crv (RA = 12h20m23s.56, Dec = -18d27'02".7)
The data on May 21 observed by D. Nogami still showed prominent
(late?) superhumps. The mean magnitude was reported to be 17.2
(vsnet-campaign-dn 3678).
OU Vir (RA = 14h35m00s.14, Dec = -00d46'07".0)
The rapid fading stopped on May 19, and it entered a
post-superoutburst slow fading phase (vsnet-campaign-dn 3671, 3673).
A possible brightening was then reported (vsnet-campaign-dn 3674).
The mean fading rate during the post-outburst fading stage is 0.1
mag/d, which is comparable to that of the plateau stage. The
post-superoutburst variation is well represented by a combination of
two periods: 0.0727 d and 0.0746 d. The former period corresponds
to the orbital period. The latter period may be related to late
superhumps (vsnet-campaign-dn 3677, 3681).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
An outburst (14.1mag) was reported by B. Monard on May 22
(vsnet-campaign-dn 3682).
V4745 Sgr (RA = 18h40m02s.54, Dec = -33d26'55".1)
Recent observations show that the nova may be in rising to a third
maximum (vsnet-campaign-nova 1258).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The very bright state still continues (vsnet-campaign-nl 119).
The light curve observed by T. Krajci showed relatively
low-amplitude (mostly 0.1 mag) QPO-like variations (typical
time-scales 15-30 min). However, this variation is somewhat unlike
in profile from those observed in KR Aur, another VY Scl-type star,
in its bright state (vsnet-campaign-nl 118).
*** Future schedule ***
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]
[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 ***
TmzV772
Light curve in the D. West's page:
http://members.aol.com/dwest61506/page39.html
[vsnet-campaign-ecl 71]
Ephemeris provided by C. Lloyd, see [vsnet-campaign-ecl 72]
HP And
Preprint by Nogami et al.:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/HP_And/hpand.pdf
[vsnet-campaign-dn 3672]
HadV98
Preprint by T. Kato et al.:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/HadV98/
[vsnet-campaign-rcb 144]
rho Cas
Links in A. Lobel's page:
http://cfa-www.harvard.edu/~alobel/amateurs.html
AAS abstract by A. Lobel et al.:
http://vsnet.aas.org/publications/baas/v34n4/aas201/1007.htm
[vsnet-campaign-rhocas 13]
eta Car
about AAVSO chart, see [vsnet-campaign-sdor 37, 38, 39]
EE Cep
The 2003 eclipse is coming. A review of past eclipses, see:
http://xxx.lanl.gov/abs/astro-ph/0303547
[vsnet-campaign-ecl 73, 74]
Recent IBVS paper by Mikolajewski et al.:
http://vsnet.konkoly.hu/cgi-bin/IBVS?5412
[vsnet-campaign-ecl 75]
IM Nor
Images taken by B. Monard:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/Novae/IM_Nor/mon2.gif
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/Novae/IM_Nor/mon2s.gif
[vsnet-campaign-nova 1257]
SN 2003el
Spectrum by the CfA team:
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/spectra/sn2003el-20030525.flm.gif
[vsnet-campaign-sn 627]
Corrigendum:
> TmzV772 (RA = 12h45m06s.82, Dec = +21d39'33".4)
>
> C. Lloyd and S. Otero call for observations of the new eclipsing...
should be
C. Lloyd and D. West call for observations of the new eclipsing...
Sorry for your confusion.
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Powerful Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
