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[vsnet-campaign-news 49] News from VSNET 49
*** News from VSNET ***
The SU UMa type dwarf nova TU Crt is now undergoing a relatively
rare 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 Apr. 10, 2001, as VSNET campaign circulation 841.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
RX J0558.3+6753 (RA = 05h58m18s.0, Dec = +67o53'46")
As reported on April 3 by T. Kinnunen, the ROSAT-selected CV
RX J0558.3+6753 experienced an outburst at 14.0mag.
This observations seems to confirm the dwarf nova nature
(vsnet-campaign 837). A. Oksanen reported B=15.66, V=16.03, and
R=15.84 on April 5 (vsnet-campaign-dn 627). The outburst seems
to be a normal one (vsnet-campaign-dn 620).
TU Crt (RA = 11h03m36s.50, Dec = -21d37'45".6)
P. Nelson reported that the SU UMa-type dwarf nova TU Crt is
undergoing one of is relatively rare outbursts. The brightness
(12.2mag) may suggest a superoutburst. The last superoutburst
occurred in 1998 March, when the first-time superhumps were detected
(vsnet-campaign 840). The superoutburst continues (vsnet-campaign-dn 631).
VV Pup (RA = 08h15m06s.73, Dec = -19d03'16".8)
The VSNET administrator team has received a request from FUSE
team to ask VSNET team to observe VV Pup (polar) on April 5 and 6,
in order to know the current activity state during the FUSE
observation. This system has a 100 min orbital period and a large
hump when the pole is in view if it is in an active state
(vsnet-campaign 838). The Kyoto team performed an observation
on April 5 (vsnet-campaign 839).
(continuous targets)
V485 Cen (RA = 12h57m23s.30, Dec = -33d12'06".8)
The superoutburst continues (vsnet-campaign-dn 619).
Z Cha (RA = 08h07m16s.29, Dec = -76d32'20".9)
The fading from the superoutburst was reported
(vsnet-campaign-dn 622, 632).
V1504 Cyg (RA = 19h28m55.87s, Dec = +43d05'39".9)
The superoutburst continues (vsnet-campaign-dn 626).
Delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
Delta Sco is still bright at about 1.8mag (vsnet-campaign-be 96).
W Com (RA = 12h21m31.5s, Dec = +28d13m57.6s)
The activity was still seen during the last week
(vsnet-campaign-blazar 173).
V4643 Sgr (RA = 17h54m40s.43, Dec = -26d14'15".7)
The object is now in a gradually fading phase and the current
(April 4) magnitude is reported to be about 13.8 (vsnet-campaign-nova 278).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
The strong activity still continues (vsnet-campaign-dn 623).
V893 Sco (RA = 16h14m45.26s, Dec = -28d39m30.3s)
The outburst was faded (vsnet-campaign-dn 625).
MKN 421 (RA = 11h04m27s, Dec = +38d12'32")
The activity around ~12.8mag is still continues
(vsnet-campaign-blazar 174).
3C 279 (RA = 12h56m11s.1, Dec = -05d47'20")
The current magnitude is about R=14.8 (vsnet-campaign-blazar 176).
M. Villata reported 3C 279 is sensibly rising on April 9
(vsnet-campaign-blazar 175).
*** Future schedule ***
RZ LMi campaign conducted by J. Patterson on April 2001
For more information, see [vsnet-campaign 718, vsnet-campaign-dn 429].
Elizabeth and Frederick White Workshop
AGN variability across the Electromagnetic Spectrum
25 - 29 June 2001 Sydney, Australia
For more information, see [vsnet-campaign-blazar 168].
Two Years of Science with Chandra *
* This meeting will also be the 12th Annual Maryland Astrophysics
Conference
September 5-7, 2001
For more information, see [vsnet-campaign-xray 66]
*** General information ***
DW Cnc
R. Novak informed he inserted runs on DW Cnc on ADA
(Visual observatory at http://ada.astronomy.cz)
(also SW UMa, DV UMa, VW CrB)
[vsnet-campaign-dn 621, 624]
Z Cha
eclipse ephemeris, see [vsnet-campaign-dn 629]
U Gem
eclipse ephemeris, see [vsnet-campaign-dn 628]
V893 Sco
eclipse ephemeris, see [vsnet-campaign-dn 630]
(This summary can be cited.)
Regards,
Makoto Uemura
vsnet-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page