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[vsnet-campaign-news 19] News from VSNET 19
*** News from VSNET ***
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.
Regards,
Makoto Uemura
On behalf of the VSNET administrator team
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Supernova (SN) 2000dj was discovered in the southeast of the spiral galaxy,
NGC 735. It is worth while to notice that the position of SN 2000dj is quite
close to that of a supernova, SN 1972L. The further studies for the nature
of these supernovae are now ongoing.
An outburst of V635 Cas, an X-ray transient, was observed both in X-ray
and optical. From the observation by G. Poyner, the X-ray outburst seems
to precede the optical one.
V1062 Cyg, which is classified as dwarf nova, shows atypical long outburst.
The recent behavior looks unlike that of a dwarf nova. More observations
are encouraged.
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).
Or, look at the list information page for more details:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/information.html
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The following was issued on Sep. 12, 2000, as VSNET campaign circulation 485.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2000dj (RA = 01h56m40s.63, Dec = +34d10'12".4)
The Lick KAIT team has discovered a mag 17 SN, SN 2000dj.
The position is about 32" east and 24" south of the nucleus of the tilted
spiral (Sb) galaxy NGC 735. The reported brightness indicate that this
SN is in the rising phase. H. Yamaoka commented in [vsnet-campaign-sn 69]
that NGC 735 has produced another SN 1972L, and it is quite close to the
reported position of SN 2000dj. H. Yamaoka further wrote in
[vsnet-campaign-sn 72] that comparing SN 2000dj image by G. Sostero, he
could not get the firm impression whether the positions are identical
or not, though he felt that SN 2000dj is slightly eastward than SN 1972L.
D. Bishop informed he obtained a SN 2000dj image from M. Armstrong and
the URL (http://vsnet.ggw.org/asras/sn2000/n735s2.jpg)(vsnet-campaign-sn 73).
More accurate astrometry and spectral confirmations are strongly urged.
RS Oph (RA = 17h50m13s.56, Dec = -06d42'30".6)
The recurrent nova RS Oph was reported slightly brighter than usual
(vsnet-campaign-nova 82). Confirmations are urged.
V730 Sgr (RA = 19h23m00s.79, Dec = -28d29'29".2)
V730 Sgr whose rare outburst was observed in early August 2000
again showed another outburst on September 5 (vsnet-campaign-dn 138).
Observations are encouraged.
(continuous targets)
V635 Cas (RA = 01h18m32s.05, Dec = +63d44'22".3)
As reported in IAUC 7487, the RXTE all-sky monitor detected an X-ray
outburst of V635 Cas = 4U 0115+63. The rise of X-ray on August 27
coincides with, but may slightly precede the optical outburst, reported
by G. Poyner in [vsnet-alert 5223] (vsnet-campaign-xray 48).
B. Sumner presented a sequence for observations in [vsnet-campaign 481].
The fading was observed in the end of the last week (vsnet-campaign-xray 52).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The object became slightly fainter from the bright state (14.3mag on
September 7 by M. Reszelski, vsnet-campaign 483).
AO Oct (RA = 21h04m59s.07, Dec = -75d21'22".5)
T. Kato wrote in [vsnet-campaign 477] that the fade of 0.8 mag
in three days may look rapid for typical superoutbursts of SU UMa stars,
which may suggest that AO Oct is an SS Cyg type dwarf nova, or may belong
to large-amplitude rapid faders among SU UMa-type systems, like V592 Her.
V368 Peg (RA = 22h58m43s.5, Dec = +11d09'13")
The data observed by L. Kral on August 27 can be available in
[vsnet-campaign-data 44]. The long superoutburst may be enter the
final fading stage on September 7 (at 14.8mag, vsnet-campaign-dn 142).
V1062 Cyg (RA = 21h08m12s.60, Dec = +36d49'16".6)
Although a fading trend from the long outburst was observed in the
end of August, V1062 Cyg is still bright, furthermore, even brighter.
T. Kato commented the behavior looks unlike that of a dwarf nova
(vsnet-campaign 474). The magnitudes in the early September far exceed
the GCVS maximum (15.5p) (vsnet-campaign 475).
It is confirmed that the object was still bright on September 7
(at 14.8mag, vsnet-campaign 482). Observations (including spectroscopy)
are encouraged to reveal the nature of the object.
V405 Vul (RA = 19h53m05s.0, Dec = +21d14'50")
T. Vanmunster reported the outburst still continues on September 6,
which means the outburst lasts at least 14 days (vsnet-campaign 479).
Observations are strongly encouraged.
Rho Cas (RA = 23h54m22s.99, Dec = +57d29'58".7)
The object is still in the fading state at around 5.0-5.3mag
(vsnet-campaign-rhocas 8).
Close monitorings are encouraged.
Delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
S. Otero reports Delta Sco has recently seemed to be fading a little
faster (vsnet-campaign-be 50). B. Fraser reported the magnitude on
September 6 to be V=2.13 (vsnet-campaign-be 51).
Close monitorings are encouraged.
SN 2000cx (RA = 01h24m46s.15, Dec = +09o30'30".9)
According to the mail forwarded by H. Yamaoka, we can see a new
light curve of SN 2000cx presented by O. Trondal (see, below 'General
Information', or vsnet-campaign-sn 68). The fading continues, and
the current magnitude is about 16mag (vsnet-campaign-sn 66).
V446 Her (RA = 18h57m21s.51, Dec = +13d14'27".3)
B. Sumner presented a sequence for observations in [vsnet-campaign 480].
AQ Eri (RA = 05h06m12s.99, Dec = -04d08'01".6)
The superoutburst was terminated on September 5. Close monitorings
to detect a possible rebrightenings are encouraged (vsnet-campaign-dn 139).
IK Nor (RA = 16h25m29s.71, Dec = -55d20'07".6)
The outburst started fading from September 5 (vsnet-campaign-dn 140).
NSV 26158 (RA = 23h53m51.02s and Dec = +23d09'19.5")
The fading from the possible outburst was still ongoing in the last
week. The current magnitude is about 15.5mag (vsnet-campaign 484).
*** Future schedule ***
EF Eri (HST observation)
Researchers at Goettingen have a plan to observe this AM Her star
with HST in near future, and strongly want to know the current state
of this star. D. Nogami provides the location (RA: 03h 14m 13.21s,
Dec: -22o 35' 42.7'' (J2000)) and the sequence
(http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/sumner/eferi.seq)
in [vsnet-campaign 467].
For more detailed information, please contact with D. Nogami
(daisaku@uni-sw.gwdg.de).
V446 Her campaign (throughout this summer)
Boris T. Gaensicke organize a campaign on the post nova V446 Her (V~18).
Their aim is to obtain a *good* contiguous light curve of V446 Her that
covers 2-3 dwarf nova-like outbursts of the system, in order to compare
its outburst characteristics to those of ``normal'' dwarf novae.
They invite those of you equipped with a CCD camera to obtain a couple
of images of V446 Her per night throughout the next three months, say,
until the end of September.
For more information, please see [vsnet-campaign 325] or contact
with Boris T. Gaensicke (boris@uni-sw.gwdg.de).
In [vsnet-campaign 446].....
"Now, one and a half month later, we present a preliminary lightcurve
which you can find at
"http://alpha.uni-sw.gwdg.de/~mschrei/v446her/light.gif".
The light curve is very interesting, ......
Hence we again invite those of you equipped with a CCD camera to
obtain a couple of images of V446Her per night at least until the
end of September. Together we can rewrite the post nova scenario !!!"
*** General information ***
V446 Her
Sequence presented by B. Sumner, see [vsnet-campaign 480]
V635 Cas
Sequence presented by B. Sumner, see [vsnet-campaign 481]
O. Trondal's new SN web page
H. Yamaoka forwarded a mail from O. Trondal which inform a new SN web
page:
http://vsnet.geocities.com/SiliconValley/Garage/9531/curves.htm
[vsnet-campaign-sn 64]
SN 2000cx
New light curve presented by O. Trondal:
http://vsnet.geocities.com/SiliconValley/Garage/9531/curves.htm
[vsnet-campaign-sn 68]
SN 2000dj
Image by M. Armstrong
http://vsnet.ggw.org/asras/sn2000/n735s2.jpg
[vsnet-campaign-sn 73]
(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
VSNET Home Page