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[vsnet-campaign-news 78] News from VSNET 58
*** News from VSNET ***
LMC V2434 experienced a giant flare which rapidly faded.
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 June. 11, 2001, as VSNET campaign circulation 971.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
LMC V2434 (RA = 05h24m01s.5, Dec = -71d09'37")
On June 6, W. Liller reported a major outburst of LMC V2434,
a M2eIII star, which is also known as a supersoft X-ray source.
The object usually remains at 12.6mag, but flared up to 9.8mag.
This outburst may be some kind of a major outburst of a supersoft
X-ray source, or a some kind of nova explosion, or symbiotic
outburst or X-ray outburst; the nature is quite unknown
(vsnet-campaign-xray 67, vsnet-campaign 965). W. Liller reported
on June 7 that the object returned to quiescent state and the
outburst was rapidly faded (vsnet-campaign 966, vsnet-campaign-xray 68).
T. Kato reported that the star is listed as B72, a foreground
LPV variable = Case 48-8 (vsnet-campaign-xray 69, vsnet-campaign 967).
H. Yamaoka reported that DSS images shows no significant proper
motion (vsnet-campaign-xray 70, vsnet-campaign 968). The object
remains calm after rapid decline (vsnet-campaign 970).
V478 Her (RA = 17h21m05s.5, Dec = +23d39'36")
AAVSO News Flash No. 793 reported that the recently identified
cataclysmic variable V478 Her is brightening. CCD observation by
Diethelm recoreded the object at 15.70 on June 4.9599 UT.
The object had been regarded as an irregular variable until
quite recently. The reported range of variability is 15.5-17.1p
(vsnet-campaign 963). T. Vanmunster confirmed the outburst
(vsnet-campaign 964). He also performed time-series observation
on June 8 and detected 0.33mag modulations which seems to
attributed to superhumps. If it is the case, V478 Her is a new
member of SU UMa stars. T. Vanmunster derived a preliminary
hump period of 0.129 d, which is near the upper limits of the
"period gap" (vsnet-campaign 969).
V1363 Cyg (RA = 20h06m11s.5, Dec = +33d42'37")
AAVSO News Flash No. 793 reported that the peculiar cataclysmic
variable V1363 Cyg is brightening. CCD observation by Diethelm
recoreded the object at 15.41 on June 4.9974 UT. The object has
been in its extended low state for years long (vsnet-campaign 962).
SN 2001ck (RA = 14h37m50s.08, Dec = +30d29'02".2)
IAUC 7641 informed the discovery of a new SN 2001ck. The host
galaxy (UGC 9425) is a northern part of the colliding pair galaxies
(= Arp 241). SN locates fairly near to the northern nucleus.
The recession velocity of this pair is about 10000 km/s, from which
the expected maximum of typical SN Ia is about 17.3. The reported
magnitudes (June 3.3 UT, 172:C; 4.3, 168:C) suggest that it can be
somewhat overluminous one (vsnet-campaign-sn 206).
SN 2001cl (RA = 22h22m37s.52, Dec = -04d07'30".8)
IAUC 7641 informed the discovery of a new SN 2001cl. The host
galaxy of SN 2001cl (NGC 7260) has another NGC entry as 7257.
The SN superimposed on the southeastern arm of the face-on barred
spiral galaxy. The SN was discovered at mag about 17.2 on June 4.5
and confirmed at the same mag on the next day. The expected
maximum of typical SN Ia is about 15.7 (vsnet-campaign-sn 206).
SN 2001cm (RA = 15h34m06s.70, Dec = +56d41'26".2)
IAUC 7641 informed the discovery of a new SN 2001cm. SN 2001cm
locates on the dust lane of the edge-on spiral galaxy, so can be
affected by the extinction. It was mag about 16.8 on June 5.72
UT and rising. The expected maximum of typical SN Ia is about 15.0
(vsnet-campaign=sn 206).
NY Ser (RA = 15h13m02s.39, Dec = +23d15'07".1)
A new outburst at 14.7mag was reported by G. Poyner on June 7
and confirmed on June 8 and 9. It may be a superoutburst
(vsnet-campaign-dn 888).
(continuous targets)
SBS 1017+533 (RA = 10h20m26s.65, Dec = +53d04'32".6)
The superoutburst continues (vsnet-campaign-dn 878).
HS Vir (RA = 13h43m38s.5, Dec = -08d14'04".1)
The time series data presented by S. Kiyota is available at
[vsnet-campaign-data 66].
V660 Her (RA = 17h42m07s.3, Dec = +23d47'37".3)
The superoutburst continues and the current magnitude is
fainter than 14.6mag (vsnet-campaign-dn 887).
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
J. M. Llapasset's observations on June 5 imply a brightening of
this nova (vsnet-campaign-nova 338). The brightening seems to
continue (vsnet-campaign-nova 339, 340).
AL Com (RA = 12h32m25s.90, Dec = +14d20'42".5)
The superoutburst is still ongoing (vsnet-campaign-dn 877, 881,
884, 885, 886, 893).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
The faint state continues (vsnet-campaign-dn 892).
3C 279 (RA = 12h56m11s.1, Dec = -05d47'20")
The object is still active (vsnet-campaign-blazar 202, 203).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
The object is again brightening. The current magnitude is
brighter than 10mag (vsnet-campaign-nova 341, 342).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
A possible outburst was detected by M. Reszelski on June 3
at about 15.2mag (vsnet-campaign-dn 876). The outburst was
confirmed in R. Novak's observation on June 5 at about 15.7mag
(vsnet-campaign-dn 883). After the outburst faded, a new outburst
at 14.5 mag was reported by M. Reszelski and confirmed by G. Poyner.
This outburst is likely a superoutburst (vsnet-campaign-dn 890).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
The object is relatively calm at around 14.2mag (vsnet-campaign-dn 879).
RX J0640-24 (RA = 06h40m47s.72, Dec = -24d23'14".5)
An outburst reported by B. Monard on May 25 were rapidly faded,
and then, it again experienced a new outburst at 11.4mag
(vsnet-campaign-dn 889). The outburst is still ongoing
(vsnet-campaign-dn 891).
*** Future schedule ***
CV confrence at Goettingen, 5-10 August 2001
[vsnet-announce 15, 20]
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 ***
V551 Sgr
Kyoto image:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/V551_Sgr/v551kyoto.gif
[vsnet-campaign-dn 882]
V478 Her
Outburst image presented by T. Vanmunster:
http://vsnet.lunarpages.com/cbabelgium
[vsnet-campaign 964]
(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