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[vsnet-campaign-news 88] News from VSNET 62
*** News from VSNET ***
R. Chassagne discovered SN 2001cz at mag 14.7 in NGC 4679 which
is one of the brightest member of the Centaurus Cluster, ACO 3526.
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 9, 2001, as VSNET campaign circulation 991.
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2001cy (RA = 22h09m27s.76, Dec = +40d59'16".5)
According to IAUC 7655, SN 2001cy was discovered by KAIT team
on June 30 when it was mag about 16.3, and confirmed one day after
at 0.1 mag brighter. The SN locates about 4" east and 6" south of
the nucleus of the spiral galaxy UGC 11927. The recession velocity
of the host galaxy (4478 km/s) suggests that the typical SN Ia on
this galaxy can reach mag 15.5 if there is no extinction. But the
Galaxtic extinction is comparably large (A_V \sim 0.7), so it seems
not become brighter than mag 16 if it is not intrinsically bright
(vsnet-campaign-sn 209).
SN 2001cz (RA = 12h47m30s.17, Dec = -39d34'48".1)
IAUC 7657 informed that R. Chassagne discovered SN 2001cz at mag
14.7. on July 4. The position is about 1" west and 32" south of
the nucleus of the tilted spiral galaxy NGC 4679. NGC 4679 is one
of the brightest member of the Centaurus Cluster ACO 3526. This
cluster has a large velocity dispersion, which is probably due to
the ongoing dynamical phenomena such as cluster merging. The
recession velocity of the cluster as a total is about 3400 km/s,
which indicate that the expected maximum of typical SN Ia is around
mag 15.0 (vsnet-campaign-sn 210).
V818 Sco (RA = 16h19m55s.07, Dec = -15d38'24".5)
V818 Sco (Sco X-1) was faint around June 21 - 25, and then,
recovered to 12.7mag in the end of June (vsnet-campaign-xray 71).
SAX J1342.2-3833 (RA = 13h42m13s.68, Dec = -38d32'24")
BeppoSAX team reported a detection of X-ray transient
SAX J1342.2-3833 on July 7. They further reported that the low
galactic latitude and a first Quick Look analysis at BeppoSAX SOC
seem to indicate a Type I burst rather than a X-ray rich GRB
(vsnet-campaign-xray 72, 73).
(continuous targets)
WX Cet (RA = 01h17m04s.17, Dec = -17d56'23".0)
The possible superoutburst continues and the current magnitude
is about 12mag (vsnet-campaign-dn 962, 966). The Kyoto team
performed time-series observations on July 1, 2, and 3 and
reported the object is gradually faded with a rate of 0.2mag/d
(vsnet-campaign-dn 964, 968). They detected a possible hump on
July 3 with an amplitude of 0.2mag (vsnet-campaign-dn 968).
V1178 Sco (RA = 17h57m06s.92, Dec = -32d23'05".0)
H. Itoh's observation on July 1 indicated a brightening from
about 12.0 to 11.3mag (vsnet-campaign-nova 385). Observations
by S. Kiyota and P. Nelson implied oscillating of the magnitude
(vsnet-campaign-nova 390). The spectrum taken by M. Fujii shows
the weak presence of P Cyg-type profile both in H-alpha and beta.
The Fe II emission series are characteristic to a Fe II-type nova
(vsnet-campaign-nova 387).
VW CrB (RA = 16h00m03s.76, Dec = +33d11'14".4)
On July 4, the Kyoto team reported that the object remained its
brightness during July 1-3 and no prominent hump is detected
(vsnet-campaign-dn 965). In the light curve in July 4 taken by
the Kyoto team, double-peaked humps are seen with an amplitude of
0.2mag. This may indicate regrowth of superhumps (vsnet-campaign-dn 970).
The current outburst lasts for more than three weeks since June 18,
which is atypically longer for ordinal SU UMa-type dwarf novae
(vsnet-campaign-dn 971). The outburst is still ongoing
(vsnet-campaign-dn 972).
GX Cas (RA = 00h49m01s.46, Dec = +56d52'44".8)
The superoutbust is still ongoing (vsnet-campaign=dn 967).
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
The gradual fading continues. The current magnitude is about
14.3mag (vsnet-campaign-nova 388, 389).
AL Com (RA = 12h32m25s.90, Dec = +14d20'42".5)
The Kyoto team reported that their observations on July 2, 3,
and 4 confirmed that the outburst was finally terminated
(vsnet-campaign-dn 969).
V446 Her (RA = 18h57m21s.51, Dec = +13d14'27".3)
D. Nogami reported that E. Pavlenko noticed him that the object
became further bright at 15.6mag on July 2 (vsnet-campaign 990,
vsnet-campaign-dn 963).
BL Lac (RA = 22h02m42.86s, Dec = +42d16'37.6")
The strong activity is still ongoing (vsnet-campaign-blazar 209).
It was reported to be very bright at around 13.3mag on July 9
(vsnet-campaign-blazar 210).
*** 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 ***
V1178 Sco
CCD images taken by A. Giambersio:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/Novae/nova_sco01/giambersio.jpg
[vsnet-campaign-nova 386]
Spectrum taken by M. Fujii:
http://vsnet1.harenet.ne.jp/~aikow/v1178sco.gif
[vsnet-campaign-nova 387]
AL Com
VSNET light curve updated:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/alcom0105.html
[vsnet-campaign-dn 969]
(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