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[vsnet-campaign-news 124] News from VSNET
*** News from VSNET ***
The black hole X-ray transient V381 Nor (= XTE J1550-564)
is undergoing a new outburst.
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 January 21, 2002, as VSNET campaign circulation 1278
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V381 Nor (RA = 15h50m58s.5, Dec = -56d28'35")
According to IAUC 7792, the black hole X-ray transient
V381 Nor (= XTE J1550-564) is undergoing an outburst. Photometry
by Bailyn has yielded V=18.33-18.36. Further CCD photometric
observations are encouraged (vsnet-campaign-xray 105).
According to IAUC 7795, a new transient radio source appeared
near the object. The relation to V381 Nor is not yet known
(vsnet-campaign-xray 107).
KUV 01584-0939 (RA = 02h00m52s.0, Dec = -09d24'32")
According to B. Warner and P. A. Woudt, KUV 01584-0939 is
an AM CVn-type cataclysmic variable with the shortest period
of about 10 min (vsnet-campaign 1276).
SN 2002C (RA = 12h27m52s.66, Dec = +27d00'06".1)
The host galaxy of SN 2002C is IC 3376, a barred-spiral ((R)SBa)
galaxy. Its recession velocity (7165 km/s) indicates that the
expected maximum for a typical SN Ia is mag about 16.7
(vsnet-campaign-sn 312). The SN was discovered at 16.7mag.
BY Cam (RA = 05h42m48s.90, Dec = +60d51'31".8)
Observations reported by G. Poyner show a possible flare of
14.3mag on January 15 and 14.4mag on January 18
(vsnet-campaign-polar 1, 2).
VZ Pyx (RA = 08h59m20s.0, Dec = -24d28'56".1)
The object is now in a superoutburst (vsnet-campaign-dn 2057).
SN 2002D (RA = 01h32m57s.80, Dec = -16d32'07".3)
The host galaxy is NGC 594, and its recession velocity predicts
the maximum for a typical SN Ia is 16.0mag. The object is
possibly in the rising phase (vsnet-campaign-sn 315). The object
was discovered at 16.8mag.
SN 2002E (RA = 12h08m52s.90, Dec = -09d02'13".2)
The host galaxy is NGC 4129, and its recession velocity predicts
the maximum for a typical SN Ia is 12.9mag. The object is
possibly in the rising phase (vsnet-campaign-sn 315). The object
was discovered at 16.8mag.
SN 2002F (RA = 03h52m58s.52, Dec = +35d35'00".8)
The host galaxy is UGC 2885, and its recession velocity predicts
the maximum for a typical SN Ia is 16.7mag. The object is
possibly in the rising phase (vsnet-campaign-sn 315). The object
was discovered at 18.1mag.
SN 2002G (RA = 13h07m55s.26, Dec = +34d05'06".5)
The host galaxy is CGCG 189-024, and its recession velocity
predicts the maximum for a typical SN Ia is 17.3mag. The object
is possibly in the rising phase (vsnet-campaign-sn 315). The
object was discovered at 17.7mag.
Possible optical counterpart to a GRB
(RA = 10h48m56s.14, Dec = -05d00'41".1)
A flaring object reaching to B=20.7 on January 15 was reported
to be a possible optical counterpart to a GRB
(vsnet-campaign-unknown 41), but it turned out to be a flare star
(vsnet-campaign-unknown-transient 1).
GK Per (RA = 03h31m12s.50, Dec = +43d54'17".8)
Some observers report slow brightening of GK Per
(vsnet-campaign-ip 84, vsnet-campaign-dn 2062).
(continuous targets)
GSC 4822.39 (RA = 07h04m04s.816, Dec = -03d50'50".94)
Pre-discovery observations by K. Haseda show no another brightening
is seen in 1997 September 29 - 2001 November 24 (vsnet-campaign-nova
730, 732, vsnet-campaign-unknown 31, 33). A. Oksanen reported that
the object was 0.2mag brighter on January 15 than on January 9
(vsnet-campaign-nova 729, vsnet-campaign-unknown 30). The gradual
brightening was also confirmed by visual and multi-color CCD
observations (vsnet-campaign-nova 741, vsnet-campaign-unknown 38).
T. Kato noticed on January 21 that reported observations imply a
beginning of a gradual fading (vsnet-campaign-nova 754). T. Kato
further commented on the similarity between the object and the
classical nova V1148 Sgr in the point of K-type spectrum
(vsnet-campaign-nova 757, vsnet-campaign-unknown 48). The object
apparently reached its maximum on Jan. 11-12 in all bands between B
and Ic. The subsequent decline seems to be slightly faster in B
(vsnet-campaign-nova 759, vsnet-campaign-unknown 50).
The object was still in the bright state
(vsnet-campaign-nova 731, 736, 739, 743, 747, 751, 753, 758,
vsnet-campaign-unknown 32, 34, 35, 40, 44, 45, 47, 49).
IM Nor (RA = 15h39m26s.47, Dec = -52d19'18".2)
B. Liller reported that the object was V=7.84 and brightening
on January 14 (vsnet-campaign-nova 728). Visual observations
also confirmed this tendency (vsnet-campaign-nova 735).
Subsequently, B. Liller reported further brighter magnitude
of V=7.66 on January 16 (vsnet-campaign-nova 737). In late
January 16, the object is reported to suddenly faded to 8.7mag
(vsnet-campaign-nova 738). The similar fading was confirmed on
January 17 by G. J. Garradd (vsnet-campaign-nova 744, 746, 750),
and then the object started gradual fading (vsnet-campaign-nova 755).
H. Yamaoka reported a precise position determined with an image
by B. Monard as shown in above (vsnet-campaign-nova 742).
The outburst is still ongoing (vsnet-campaign-nova 733, 752).
OJ 287 (RA = 08h51m57s, Dec = 20d17'59")
The object is still active (vsnet-campaign-blazar 244).
SU Tau (RA = 05h49m03s.7, Dec = +19d04'21")
Observations reported to VSNET imply a possible slow fading
(vsnet-campaign-rcb 12).
IP Peg (RA = 23h23m08s.7, Dec = +18d24'59".1)
The outburst continues (vsnet-campaign-dn 2049, 2055, 2061,
2063).
DI UMa (RA = 09h12m22s.16, Dec = +50d49'39".1)
A new outburst of 15.4mag was reported on January 18 by
G. Poyner (vsnet-campaign-dn 2059).
KS UMa (RA = 10h20m26s.54, Dec = +53d04'33".5)
The last superoutburst has faded (vsnet-campaign-dn 2052).
W Com (RA = 12h21m31.5s, Dec = +28d13m57.6s)
The object faded from the slightly active state
(vsnet-campaign-blazar 245).
HV Vir (RA = 13h21m03s.0, Dec = +01d53'28")
T. Krajci reported the gradual decline and the decreased amplitude
of superhumps on January 14 (vsnet-campaign-hvvir 61, 62).
Superhumps possibly regrowth on January 15 (vsnet-campaign-hvvir 63),
and confirmed on January 16 with 0.2mag superhumps
(vsnet-campaign-hvvir 65). The fading trend stopped on January 17
with even large superhumps (vsnet-campaign-hvvir 67). And it again
started somewhat rapid fading on January 18 (vsnet-campaign-hvvir 69).
T. Kato analyzed these data and reported the humps are not
late-superhumps, but ordinary superhumps which appeared in the
early phase (vsnet-campaign-hvvir 70). The superhumps still appeared
in January 19 (vsnet-campaign-hvvir 71). The rapid fading phase will
come soon (vsnet-campaign-hvvir 64, 66, 68).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
Reported observations show the object is still bright at
13.0-13.4mag (vsnet-campaign-unknown 36, 46).
HL CMa (RA = 06h45m17s.0, Dec = -16d51'35")
The object remained relatively bright state at about 12.7mag
(vsnet-campaign-dn 2050) until January 15 when an outburst
subsequently reaching 11.4mag was reported (vsnet-campaign-dn
2051, 2060).
eta Car (RA = 10h45m03s.65, Dec = -59d41'03".7)
The object is calm at about 5.3mag (vsnet-campaign-sdor 9).
BL Lac (RA = 22h02m42.86s, Dec = +42d16'37.6")
BL Lac was reported to be in an outburst of 13.5mag on January 20.
Since BL Lac is renowned for its extremely short variation, frequent
observations are very encouraged (vsnet-campaign-blazar 246, 247).
RR Tau (RA = 05h39m30s.53, Dec = +26d22'26".3)
The rapid brightening is ongoing (vsnet-campaign-orion 7).
OW Gem (RA = 06h31m41s.78, Dec = +17d04'56".0)
The object recovered from the last eclipse
(vsnet-campaign-ecl 37, 39, 40).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The object is now very bright state at about 1.7mag
(vsnet-campaign-be 155, 156).
SS UMi (RA = 15h51m22s.4, Dec = +71d45'11".1)
The last bright outburst has faded (vsnet-campaign-dn 2053).
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
The object is still faint (vsnet-campaign-nova 756).
SN 2001ig (RA = 22h57m30s.69, Dec = -41d02'25".9)
IAUC 7793 informed that the spectrum of this SN IIb made
a transition from type II to type Ib/c-like one around Jan.
13.0. The expansion velocity is quite larger and the luminosity
seems brighter (if it is further than 10Mpc) than the typical
SN IIb 1993J on the similar phase (vsnet-campaign-sn 313).
The object is now very bright and gradually fading
(vsnet-campaign-sn 314, 316).
DW Cnc (RA = 07h58m56s.80, Dec = +16d16'48".2)
The object still shows active short-term variations
(vsnet-campaign-nl 59, vsnet-campaign-dn 2054).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
It again brightened to 13.6mag as reported by B. Monard
on January 17 (vsnet-campaign-dn 2058, 2064).
FS Aur (RA = 05h47m48s.34, Dec = +28d35'11".1)
A possible outburst of 14.1mag was reported on January 16
by P. A. Dubovsky (vsnet-campaign-dn 2056).
*** Future schedule ***
34TH COSPAR - GRB AFTERGLOW PHYSICS
HOUSTON, TX, USA, 10-19 OCTOBER 2002
Main Scientific Organizer (MSO):
Elena Pian - INAF, Astronomical Observatory of Trieste, Italy -
pian@ts.astro.it
http://vsnet.ts.astro.it/topics/topix.html
[vsnet-campaign-grb 1]
MASS-LOSING PULSATING STARS AND THEIR CIRCUMSTELLAR MATTER
Sendai, Japan: May 13-16, 2002
contact to: Dr. M. Seki or wsloc@astr.tohoku.ac.jp
http://vsnet.astr.tohoku.ac.jp/ws2002/
[vsnet-campaign-mira 3]
International Conference on Classical Nova Explosions
Sitges (Barcelona), Spain: 20-24 May 2002
For more detailed information, see http://vsnet.ieec.fcr.es/novaconf
[vsnet-campaign-nova 643]
[vsnet-campaign-nova 666]
Blazar meeting at Tuorla: June 17-21, 2002
for more information, see http://vsnet.astro.utu.fi/blazar02
[vsnet-campaign-blazar 232]
International workshop
"XEUS - studying the evolution of the hot universe"
March 11-13, 2002 ; MPE Garching, Germany
for more information, see
http://wave.xray.mpe.mpg.de/conferences/xeus-workshop
[vsnet-campaign-xray 98]
[vsnet-campaign-xray 104]
Campaign on YY Eri
2002 February 9 and 10
conducted by Japan Variable Star Study Association
http://vsnet4.airnet.ne.jp/mira/nhk/index.html
[vsnet-campaign-ecl 38]
*** General information ***
IP Peg
Corrected eclipse ephemeris, see [vsnet-campaign-dn 2048]
WZ Sge
preprint presented by T. Kato:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/WZ_Sge-early/
[vsnet-campaign 1277]
IM Nor
CCD image taken by B. Monard:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/Novae/IM_Nor/monard.gif
[vsnet-campaign-nova 734]
V381 Nor
Sequence (and comments) provided by B. Skiff, see
[vsnet-campaign-xray 106]
V1028 Cyg
Data observed by G. W. Billings:
http://vsnet.telusplanet.net/public/obs681/mc17-mc24.gif
http://vsnet.telusplanet.net/public/obs681/V1028Cmc.txt
[vsnet-campaign-data 86]
GSC 4822.39
Multi-color photometry provided by S. Kiyota, see
[vsnet-campaign-nova 740][vsnet-campaign-unknown 37]
Spectrum taken by M. Gavin:
http://vsnet.astroman.fsnet.co.uk/novamon3.gif
[vsnet-campaign-nova 745]
[vsnet-campaign-unknown 39]
http://home.freeuk.com/m.gavin/pecmon02.htm
[vsnet-campaign-nova 749]
[vsnet-campaign-unknown 43]
Summary of astrometry, see [vsnet-campaign-nova 748]
MisV1147
Chart made by M. Simonsen:
http://joevp.20m.com/cgi-bin/i/charts/sxncharts/Cep_MisV1147_sxn.gif
http://joevp.20m.com/cgi-bin/i/charts/sxncharts/Cep_MisV1147_Rsxn.gif
[vsnet-campaign-unknown 42]
(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