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[vsnet-campaign 234] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
FX Cep (RA = 21h03m12.5s, Dec = +66d10m51.2s)
T. Vanmunster performed a CCD photometry of FX Cep which is
undergoing an outburst, on Jun 17/18. During 3.7 hours run, the
object, at 15.5mag, did not show any periodic signals (vsnet-campaign 227).
He mentioned this result seems to support FX Cep's classification
as an UGSS-type dwarf nova, although more intensive observations
are required.
NSV02872 (RA = 06h14m08.2s, Dec = +45d30m29s)
This ROSAT-selected objects are put on the long-term vsnet-campaign
(monitoring for outburst) program (vsnet-campaign 230).
(see, http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg03107.html)
PT Per (RA = 02h42m51.2s, Dec = +56d41m31s)
This ROSAT-selected objects are put on the long-term vsnet-campaign
(monitoring for outburst) program (vsnet-campaign 230).
(see, http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg03113.html)
V893 Sco (RA = 16h14m45.26s, Dec = -28d39m30.3s)
According to R. Stubbings, the eclipsing dwarf nova (SU UMa candidate)
below the period gap is in outburst at 12.6mag on June 19
(vsnet-campaign 231). The present brightness suggests a normal
outburst, but no one knows whether this outburst evolves into a
superoutburst ?!
V436 Cen (RA = 11h13m58.2s, Dec = -37d40m45.0s)
Although the season is ending, the SU UMa-type dwarf nova V436 Cen
is undergoing a rare outburst at 11.9 mag on 19 June (vsnet-campaign 233,
vsnet-alert 4998). The last outburst (normal outburst) was observed
around 2000 Jan. 1, reaching mv=11.8. The last reported superoutburst
occurred in 1998 October (vsnet-alert 4998).
The present brightness does not exclude the possibility of a
superoutburst.
(continuous targets)
V1494 Aql (RA = 19h23m05.4s, Dec = +04d57m20.1s)
A. Retter reported that his observation during 3 nights in June
revealed the evidence for a periodicity of 1.5 hours with the variation
amplitude of 0.05mag (vsnet-campaign 207). L. Cook also detected
the periodic variation (P=91min) and the amplitude of about 0.04mag
(vsnet-campaign 216, 222). He also reported the object showed
0.109mag decline over the 24 hours (vsnet-campaign 222).
The current magnitude is about 10.4mag. More observations are
encouraged.
XTE J1118+480 (RA = 11h18m10.9s, Dec = +48d02m12.9s)
From the data from JD2451700 to 2451710 observed by VSNET collaboration
team (Kyoto team and L. Cook), the period is calculated as 0.17062(11)d.
The ten days averaged light curve shows a flat peak and a flat bottom.
The amplitude of the humps does not change from the previous one
(about 0.08 mag) (vsnet-campaign 210).
The hump is still prominent. To study the hump evolution and
optical QPOs, more observations are urged.
V803 Cen (RA = 13h23m44.5s, Dec = -41d44m30.1s)
Strong fluctuations around 14 - 13 mag were observed (vsnet-campaign 208,
218, 224, 228). Observations are strongly needed, since such strong
day-scale fluctuation tends to rapidly damp during the slow fade
(vsnet-campaign 208).
CI Aql (RA = 18h52m03.6s, Dec = -01d28m38.9s)
The light curve on June 15 by Kyoto team shows a transient brightening
of 0.3 mag centered at June 15.79 UT superimposed on an apparent rise
from the primary minimum (vsnet-campaign 214). The analysis of combined
data by S. Kiyota (Tsukuba, Japan) and the Kyoto team on Jun. 15 has
yielded a detection of the primary eclipse minimum. The eclipse was
0.3mag deep. A preliminary analysis yielded a mid-eclipse time of
15.597 UT, while the prediction (based on the epehemeris in IBVS 4232,
Mennickent and Honeycutt) was 15.586 UT (vsnet-campaign 220).
More observations are strongly needed to confirm the positive
detection of the eclipse O-C.
BD Pav (RA = 18h43m12.0s, Dec = -57d30m45.1s)
The eclipsing SS Cyg-type dwarf nova BD Pav has just faded from the
recent rare outburst (vsnet-campaign 223).
V493 Lyr (RA = 19h01m31.9s, Dec = +42d54m46.5s)
T. Vanmunster reported the light curve on Jun 12/13 is showing
some modulation, although he wouldn't attribute it to superhumps
(vsnet-campaign 226). He mentioned it seems V493 Lyr indeed
is a long-period UGSS-type dwarf nova, as also suggested by T. Kato,
in (vsnet-campaign 194).
Now it is in fading phase. The current magnitude is about 15.
LX Ser (RA = 15h37m59.1s, Dec = +18d51m43.9s)
The eclipsing cataclysmic variable LX Ser has been reported fainter
(>15mag) since June 11. Please continue monitoring to see whether
the star becomes brighter, as in early June (vsnet-campaign 229).
*** Future schedule ***
BL Lac campaign (July 17 - August 11)
Massimo Villata, Gino Tosti, and Enrico Massaro organize an
optical campaign on BL Lac contemporaneous with the high-energy
campaign involving X-ray and TeV observatories such as BeppoSAX,
RXTE, STACEE, CAT, HEGRA. Their goal is high-density and
high-precision coverage, possibly in two optical bands (B and R).
Observers interested in participating to this optical campaign are
invited to contact with M. Villata (villata@to.astro.it).
[vsnet-campaign 204]
*** General information ***
CI Aql
eclipse ephemeris, see [vsnet-campaign 203]
XTE J1118+480
new light curve is seen at:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/xtej1118-camp.html
BD Pav
eclipse ephemeris, see [vsnet-campaign 223]
V893 Sco
eclipse ephemeris, see [vsnet-campaign 231]
(This summary is reproduction free.)
Regards,
Makoto Uemura
vsnet-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
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