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[vsnet-campaign-news 184] News from VSNET
*** News from VSNET ***
The superoutburst of CT Hya entered a rapid fading phase.
SW UMa, now in a post-superoutburst phase, still shows modulations.
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 November 25, 2002, as VSNET campaign
circulation 1350
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(continuous targets)
CT Hya (RA = 08h51m04s.50, Dec = +03d07'43".5)
Superhumps were clearly detected on November 16 and 17
(vsnet-campaign-dn 3040). The superoutburst continued on November
22 (vsnet-campaign-dn 3041, 3044). The November 23 data clearly
show a ~0.8 mag drop, indicating that the superoutburst has entered
the rapid decline stage (vsnet-campaign-dn 3048).
SN 2002hy (RA = 10h54m39s.18, Dec = -21d03'41".2)
According to IAUC 8019, the ESO team has revealed that it is a
peculiar type-Ib supernova soon after explosion. He I lines are
prominent, and they have P-Cyg profiles (v_exp about 9500 km/s
derived from He I 587.5 nm absorption minimum). Narrow H-alpha and
H-beta absorption lines are identified at v_exp about 16000 km/s,
which are probably made by the outermost thin hydrogen-rich layer.
It is considerably reddened (E(B-V) about 0.17), so its luminosity
is somewhat larger than normal SN Ib (vsnet-campaign-sn 508).
RX And (RA = 01h04m35s.55, Dec = +41d17'58".0)
A new outburst was detected on November 19 by E. Muyllaert. A
possible low state had finished, but the outburst interval is rather
unusual (vsnet-campaign-dn 3042).
SW UMa (RA = 08h36m42s.80, Dec = +53d28'38".2)
On Nov. 16, SW UMa seems to have become slightly brighter than on
the previous nights, breaking the slow declining trend. Short-term
variations with time-scales of 10-20 min were strongly present.
Some of them seem to show some degree of coherence. Some of the
variations look like to be associated with late superhumps and their
harmonics (vsnet-campaign-dn 3039). The object kept its
post-superoutburst magnitude level on November 19. A new humps
having a superhump-like profile appeared, although the period is
different from ordinary superhumps or late superhumps
(vsnet-campaign-dn 3043).
V1504 Cyg (RA = 19h28m55.87s, Dec = +43d05'39".9)
A new outburst of 14.1mag was reported on November 22 by
E. Muyllaert (vsnet-campaign-dn 3045).
Z UMi (RA = 15h02m01s.35, Dec = +83d03'48".7)
The object further faded (vsnet-campaign-rcb 86).
*** Future schedule ***
MINE OBSERVATIONS OF CYG X-1
F. Mirabel announced that the INTEGRAL satellite will point to
Cygnus X-1 for 1 million seconds between November 24 and December
6. In the context of the "MINE" collaboration
(http://elbereth.obspm.fr/~fuchs/mine.html), monitoring programs are
recommended for this period.
[vsnet-campaign-xray 166]
For further information, please, be in contact with Yael Fuchs
(yfuchs@discovery.saclay.cea.fr).
Texas in Tuscany
XXI Symposium on Relativistic Astrophysics
Florence, Italy, December 9-13, 2002
For more information:
http://vsnet.arcetri.astro.it/~texaflor/
[vsnet-campaign-xray 142]
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]
*** General information ***
Rho Cas
Preprint by A. Lobel et al, posted to astro-ph (astro-ph/0211508)
[vsnet-campaign-rhocas 10]
Corrigendum:
In the last "VSNET Weekly Campaign Summary"...
> SN 2002hc (RA = 08h17m06s.05, Dec = -27d27'27".0)
>
> H. Yamaoka reported a revised estimation of magnitude on September
> 9 to be 15.4CR mag based on GSC2.2 Fmag and UCAC1 magnitude. He
The date is not "September 9", but "November 4.927".
Sorry for confusion.
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page