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[vsnet-campaign-news 73] News from VSNET 57
*** News from VSNET ***
SN 2001cj was discovered in a galaxy in the famous "human-shaped"
region of CfA redshift survey, and it is significantly brighter
than expected.
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. 4, 2001, as VSNET campaign circulation 961.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2001cj (RA = 13h21m44s.85, Dec = +31d14'48".6)
SN 2001cj was discovered by the KAIT team and confirmed on
May 30.3 UT and 31.3 UT, when SN was mag about 15.9 and 15.7.
The position is about 7" west and 35" north of the nucleus of
a barred-spiral galaxy UGC 8399. The spectrum of this SN
indicates that it is of type Ia before optical maximum.
Interestringly, this galaxy is included by the famous "fan-shaped
figure" of the CfA redshift survey, and is one of the member of
the "human-shaped" region. From the CfA survey, it is suggested
that UGC 8399 is a member of the "group 81" whose mean v_r is
about 7200 km/s. The expected maximum of typical SN Ia is around
mag 16.5, which is far dimmer than one at discovery. Meanwhile,
the "group 82" (v_r = 5100 km/s) lies foreground of group 81.
If the distance of SN 2001cj corresponds to the recession velocity
of group 82, the expected maximum is mag about 15.7. It is quite
important to determine whether SN 2001cj is intrinsically bright
(slow decliner) or is normal one. It can probe the true distance
of the group 81 (vsnet-campaign-sn 205).
SBS 1017+533 (RA = 10h20m26s.65, Dec = +53d04'32".6)
As reported by G. Poyner, the SU UMa-type dwarf nova SBS 1017+533
is undergoing a superoutburst. The last superoutburst was
reported in 2000 September-October, which was not well observed
because of the poor location in the sky. The current outburst
seems to provide an excellent opportunity to study this dwarf nova
in detail (vsnet-campaign 947). The superoutburst still continues
(vsnet-campaign-dn 861, 864).
(SN) 2001bn (RA = 14h30m39s.53, Dec = -02d06'00".6)
According to IAUC 7624, a supernova candidate SN 2001bn was
discovered by the QUEST collaboration. IAUC 7640 tells that
spectroscopy revealed strong narrow Balmer absorption lines at
z=0, and concluded it is a Galactic blue variable
(vsnet-campaign-dn 871, vsnet-campaign 958).
KN Gem (RA = 06h35m52s.26, Dec = +26d53'24".4)
According to IBVS 5083 (Samus), the GCVS element of KN Gem actually
referred to that of BR Gem. KN Gem thus remains a suspected dwarf
nova, as originally reported. A vigorous search for possible future
outbursts (brightenings) is very encouraged (vsnet-campaign 956).
HadV89 (RA = 18h15m27s.0, Dec = -18d57'21")
K. Haseda reported a new variable star, HadV89. T. Kato noticed
that the star may be some sort of an eruptive variable since no
apparent star exists on its position first reported
(vsnet-campaign 952, vsnet-campaign-nova 333). The revised
position however indicates the object is identified with a red
object. The object is most likely a Mira-type variable, not a nova
(vsnet-campaign 953, vsnet-campaign-nova 334). B. Skiff suggests
it is an object in MSX catalogue (vsnet-campaign-nova 335,
vsnet-campaign 954).
(continuous targets)
V551 Sgr (RA = 18h00m56s.46, Dec = -34d35'45".6)
The outburst is still ongoing (vsnet-campaign-dn 849, 865).
StHa-164 (RA = 19h26m01s, Dec = -06d09'53")
A. Henden reported a misprint in their paper that the magnitudes
from his three night of photometry is V=14.47, not B=14.47
(vsnet-campaign 945).
V893 Sco (RA = 16h14m45s.26, Dec = -28d39'30".3)
The outburst was terminated (vsnet-campaign-dn 853).
HS Vir (RA = 13h43m38s.5, Dec = -08d14'04".1)
The superoutburst continues (vsnet-campaign-dn 848,850,860,867).
The data taken by S. Kiyota on May 29 is available in
[vsnet-campaign-data 65].
V660 Her (RA = 17h42m07s.3, Dec = +23d47'37".3)
The fading from the outburst was reported by M. Uemura on May 30
(vsnet-campaign-dn 854,857), and then, the object re-brightened to
14.4mag on May 31 as reported by C. P. Jones. The short outburst
should have been a precursor to superoutburst(vsnet-campaign 955).
M. Uemura confirmed the outburst and performed time-series observation
on Jun 1 (vsnet-campaign-dn 870). J.Pietz reported his past
observations and suggests the supercycle of about 1 year and
the cycle of normal outbursts of about 60 days (vsnet-campaign 960).
BF Ara (RA = 17h38m10s.40, Dec = -47d10'43".4)
As reported by A. Peace on May 27, BF Ara showed a bright (14.3mag)
outburst (vsnet-campaign 948). The fading from the outburst was
reported on May 31 by R. Stubbings (vsnet-campaign-dn 868).
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
(= Nova Aql 2001)
The current magnitude is about 14.2mag and on the gradual
declining (vsnet-campaign-nova 330, 337). The GCVS designation has
been given the nova as V1548 Aql (vsnet-campaign-nova 336).
AL Com (RA = 12h32m25s.90, Dec = +14d20'42".5)
The superoutburst is still ongoing (vsnet-campaign-dn 847,852,
859,866,872,875). The data on May 26 still shows early superhumps
with small amplitude (vsnet-campaign-dn 862). The data on May 28
at Kyoto clearly show the evolution of normal superhumps
(vsnet-campaign 946). R. Ishioka reported that period analysis
yields 0.0581d, 2.6% larger than the orbital period using May 27
and 28 data (vsnet-campaign-dn 855, 856). G. W. Billings' data on
May 30 shows superhumps with an amplitude of 0.26mag
(vsnet-campaign-dn 869).
MM Hya (RA = 09h14m13s.97, Dec = -06d47'45".0)
The superoutburst continued until around June 3 when R. Ishioka
found it has been fainter than 17.0mag (vsnet-campaign-dn 851, 874).
V503 Cyg (RA = 20h27m15s.61, Dec = +43d41'45".5)
The superoutburst was terminated around May 30 (vsnet-campaign-dn 873).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
The helium dwarf nova V803 Cen has faded from the recent
"standstill" at around 13mag (vsnet-campaign 949).
3C 279 (RA = 12h56m11s.1, Dec = -05d47'20")
The object is still very active (vsnet-campaign-blazar 200).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
It remains around 10.6mag (vsnet-campaign-nova 331, 332).
Delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The bright state continues (vsnet-campaign-be 132).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
Outbursts wer reported by P. A. Dubovsky on May 25 at 15.0mag
(vsnet-campaign-dn 858) and by M. Reszelski on May 30 at 15.1mag
(vsnet-campaign-dn 863).
WR106
K.Takamizawa provided the data on WR106 since 1994 February
(vsnet-campaign-data 64). According to his and K. Haseda's data,
One fading season is observed in early 2000 (vsnet-campaign 951).
*** Future schedule ***
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 ***
AL Com
VSNET page for the current superoutburst:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/alcom0105.html
[vsnet-campaign 950, 959]
V1159 Ori
The preprint of "Changing Supercycle of the ER UMa-Type Star V1159 Ori"
by T. Kato is available from:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/V1159_Ori-cycle/
or [vsnet-preprint 31]
[vsnet-campaign 957]
(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