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[vsnet-campaign-news 87] News from VSNET 61
*** News from VSNET ***
A relatively rare outburst of WX Cet is now ongoing.
Nova V1548 Aql is brightening again.
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 2, 2001, as VSNET campaign circulation 989.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
WX Cet (RA = 01h17m04s.17, Dec = -17d56'23".0)
As reported by S. Kerr, WX Cet is in outburst of 11.8mag since
June 30. The last outburst occurred in 1998 November
(vsnet-campaign 987). The Kyoto team confirmed the outburst on
July 1 (vsnet-campaign-dn 958), and detected a hints of smooth
modulations with an amplitude with 0.1-0.2 mag (vsnet-campaign-dn 961).
V893 Sco (RA = 16h14m45.26s, Dec = -28d39m30.3s)
As reported by R. Stubbings and P. Williams, the eclipsing dwarf
nova V893 Sco experienced an outburst of 12.7mag on June 27
(vsnet-campaign-dn 947). The bright state lasted for two nights
(vsnet-campaign 986), and then seems to be terminated on June 30
(vsnet-campaign-dn 959).
(continuous targets)
V1178 Sco (RA = 17h57m06s.92, Dec = -32d23'05".0)
W. Liller reported V-magnitudes of this nova of 11.35-11.36mag
on June 24 (vsnet-campaign-nova 368), 12.22-12.33 on June 26
(vsnet-campaign-nova 371, 378), and 11.70-11.85 on June 27, which
imply the presence of short-term variation. S. Kiyota also
reported Ic=10.42 and V=12.25 (vsnet-campaign-nova 370). K. Kadota
provides accurate astrometry (vsnet-campaign-nova 379). The object
is now on the gradual fading trend, and the current magnitude is
about 12.2mag (vsnet-campaign-nova 369, 372, 374, 381).
RS Oph (RA = 17h50m13s.56, Dec = -06d42'30".6)
The bright state continues (vsnet-campaign-nova 380).
SW UMa (RA = 08h36m42s.80, Dec = +53d28'38".2)
The superoutburst continued until June 29 when rapid fading
from 10.6mag to 11.5mag was reported (vsnet-campaign-dn 934, 940,
952, 955).
VW CrB (RA = 16h00m03s.76, Dec = +33d11'14".4)
The superoutbust continues, and the current magnitude is about
15mag (vsnet-campaign-dn 936, 941, 948, 954). The Kyoto team
performed time-series photometry on June 26, and detected a
superhump with an amplitude of 0.3mag (vsnet-campaign-dn 943).
They furthermore reported the object is gradually declining with
~0.1mag/d (vsnet-campaign-dn 960).
GX Cas (RA = 00h49m01s.46, Dec = +56d52'44".8)
The superoutburst is still ongoing, and it is about 13.8mag now
(vsnet-campaign-dn 935, 942, 951).
BC UMa (RA = 11h52m15s.88, Dec = +49d14'42".0)
The faint outburst lasted unexpectedly longer (vsnet-campaign-dn
937, 939), however then showed possible rapid decline since June 27
(vsnet-campaign-dn 949, 953).
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
The superoutburst continued at lease until June 25
(vsnet-campaign-dn 938).
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
S. Kiyota's observations indicates a brightening of this nova
(vsnet-campaign-nova 370). The object then again gradually faded
(vsnet-campaign-nova 373), and again re-brightened on June 28
(vsnet-campaign-nova 376). The current magnitude is 13.3mag
(vsnet-campaign-nova 382).
AL Com (RA = 12h32m25s.90, Dec = +14d20'42".5)
The Kyoto team and Brno team reported that they performed
time-series photometry during the last week. The rebrightening
state is still continues (vsnet-campaign-dn 945).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
The bright state seems to be interrupted on July 1 as reported
to be 11.2mag by B. Monard (vsnet-campaign-nova 375, 384).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
An outburst of 15.5mag was reported by M. Reszelski on June 25
(vsnet-campaign-dn 950).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The recent activity is summarized in [vsnet-campaign-dn 956].
V446 Her (RA = 18h57m21s.51, Dec = +13d14'27".3)
D. Nogami reported that E. Pablenko noticed him that the object
is in intermediate brightness at mag~15.9 on July 1, which means
that V446 Her is now ascending or descending (vsnet-campaign-dn 957,
vsnet-campaign-nova 383, vsnet-campaign 988).
*** Future schedule ***
V446 Her campaign until September
conducted by Matthias Schreiber, Boris Gaensicke, and Daisaku Nogami
For more detailed information, see [vsnet-campaign-dn 918],
[vsnet-campaign-nova 349], or [vsnet-campaign 983]
CV conference at Goettingen, 5-10 August 2001
[vsnet-announce 15, 20]
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 ***
AL Com
VSNET page updated:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/alcom0105.html
[vsnet-campaign-dn 944]
V893 Sco
eclipse ephemeris, see [vsnet-campaign-dn 946]
(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