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[vsnet-campaign-news 181] News from VSNET
*** News from VSNET ***
A rare outburst of the SU UMa-type dwarf nova, PU Per was detected.
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 November 4, 2002, as VSNET campaign
circulation 1347
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
AW Sge (RA = 19h58m37s.11, Dec = +16d41'28".7)
M. Simonsen detected an outburst of the poorly known SU UMa star,
AW Sge at 14.4mag on October 31. The last recorded outburst
(superoutburst) was in 2000 July (vsnet-campaign-dn 2946). The
brightness suggested a superoutburst (vsnet-campaign-dn 2949).
Observations by the Nyrola team, however, indicated a rather rapid
decline at a rate of 0.9 mag/d (vsnet-campaign-dn 2955). On October
31, T. Vanmunster reported irregular modulations with an amplitude
of about 0.3mag, which are not superhumps (vsnet-campaign-dn 2956,
2958, 2960). After the fading, a possible rebrightening to 17.2mag
on November 3 was reported by D. Starkey (vsnet-campaign-dn 2951,
2954, 2969). Confirmations are urged.
PU Per (RA = 02h42m16s.1, Dec = 35d40'46")
M. Simonsen reported on November 1 that the SU UMa-type dwarf
nova, PU Per is undergoing a rare, bright (14.7mag) outburst. The
last reported outburst of PU Per occurred in 1998 September. Its
large outburst amplitude and long recurrent time suggest that the
object may be related to WZ Sge-type stars (vsnet-campaign-dn
2959). In the light curve taken by D. Starkey, small-amplitude
variations are likely present, while there is no distinct
superhumps (vsnet-campaign-dn 2962). The time-series observation by
G. Billings on November 2 yields a light curve showing a rather
rapid linear fading, with 0.1-mag fluctuations. T. Kato commented
that, judging from the behavior up to now and the short-term
variations, the outburst may be a normal outburst, or a precursor
outburst of an expected superoutburst (vsnet-campaign-dn 2963, 2967).
The object further faded by 1.5mag on November 3, which supports
that the outburst is a normal one (vsnet-campaign-dn 2970).
SN 2002hh (RA = 20h34m44s.29, Dec = +60d07'19".0)
SN 2002hh was discovered by the KAIT team on Oct. 31.1 UT (mag
about 16.5) and confirmed on Nov. 2.1 (mag about 16.3). The
position of the new object is about 61" west and 114" south of the
nucleus of a face-on open spiral galaxy NGC 6946. NGC 6946 produced
at least 6 SNe (1917A, 1939C, 1948B, 1968D, 1969P, and 1980K) in the
last century. The brightest one of these six was SN IIL 1980K,
whose maximum was B=11.6. It was below mag about 19.0 on Oct. 26.1.
It should definitely be in the rising phase (vsnet-campaign-sn 491).
V344 Ori (RA = 06h15m18.94, Dec = +15d30'59".9)
M. Simonsen detected an outburst of V344 Ori at 14.1mag on
November 1. V344 Ori is an unusual dwarf nova which underwent an
exceptionally bright outburst in 2000 January (vsnet-campaign-dn
2959, 2964). The Kyoto team confirmed the outburst on November 1
(vsnet-campaign-dn 2965).
DM Lyr (RA = 18h58m45s.02, Dec = +30d15'39".9)
The SU UMa-type dwarf nova DM Lyr experienced an outburst, as
reported by M. Simonsen on October 31. The magnitude (14.4mag) may
suggest a superoutburst. No definite superoutburst has been
reported since 2000 July (vsnet-campaign-dn 2952). The likely
superoutburst is now ongoing (vsnet-campaign-dn 2966).
CW Mon (RA = 06h36m54s.5, Dec = +00d02'16")
The SS Cyg-type dwarf nova CW Mon experienced a relatively rare
full outburst (12.9mag), as reported by D. Taylor on October 29 and
M. Simonsen on October 31. The object may be a grazing eclipser
with a period of 0.1762 d (vsnet-campaign-dn 2953).
(continuous targets)
V4744 Sgr = Nova in Sgr No. 4 (RA = 17h47m21s.724, Dec = -23d28'22".79)
This nova in Sgr has been given the permanent GCVS designation,
V4744 Sgr (vsnet-campaign-nova 1129). In the spectrum taken by
M. Fujii on October 29, a weak and narrow H-alpha emission line,
associated with a prominent P Cyg profile, has been detected. The
NaD absorption line is strong. M. Fujii comments that the overall
appearance of the spectrum resembles those of V838 Mon taken around
2002 Feb. to Mar. (vsnet-campaign-nova 1131). H. Yamaoka performed
astrometry using images taken by S. Kiyota and P. Nelson and
reported the position above. Even in the deepest DSS image
(limiting Rmag about 21.0) and 2MASS infrared image, no object can
be found within 5" of this position (vsnet-campaign-nova 1137,
1138). Tha lack of a bright 2MASS counterpart seems to preclude the
possibility of a symbiotic nova (vsnet-campaign-nova 1139). The
object is now V~11 (vsnet-campaign-nova 1123, 1124, 1126, 1127,
1128, 1130, 1132, 1133, 1134, 1136).
SN 2002hb (RA = 22h56m03s.58, Dec = +13d37'31".0)
According to IAUC 8002, it is a type Ia SN about 1 month after
maximum, at a redshift of about 0.09 (vsnet-campaign-sn 488).
SN 2002hd (RA = 08h54m03s.39, Dec = -07d11'21".5)
According to IAUC 8002, it is also a type Ia SN, about 5 days
after maximum at redshift of about 0.035. The discovery magnitude
is consistent with the expected maximum (vsnet-campaign-sn 488).
SN 2002he (RA = 08h19m58s.83, Dec = +62d49'13".2)
According to IAUC 8004, it is SN Ia (possibly subluminous) near or
a few days before the maximum light on Oct. 30.47 (vsnet-campaign-sn
490). B. Romanishin commented that this SN is of particular
interest because it may be a sub-luminous Ia, and it would be very
nice to pin down peak magnitude (vsnet-campaign-sn 492).
SW UMa (RA = 08h36m42s.80, Dec = +53d28'38".2)
The light curve taken by K. Torii on October 27 shows the fully
grown superhumps (0.2 mag)(vsnet-campaign-dn 2937, 2940). L. Kral
reported that T. Hynek also confirmed superhumps of 0.2mag on
October 26/27 (vsnet-campaign 1346). On October 28, superhumps
observed by K. Tanabe further increased in amplitude (0.25mag)
(vsnet-campaign-dn 2943). The Oct. 29 data show the presence of
(super)QPOs with a typical period of 3-4 min, although the
phenomenon is not as striking as in the 1992 one (vsnet-campaign-dn
2957). The superoutburst is still ongoing (vsnet-campaign-dn 2945,
2948).
V844 Her (RA = 16h25m01s.69, Dec = +39d09'25".9)
V844 Her was reported to be still active at 14.2 mag on Oct. 28
(vsnet-campaign-dn 2942).
RR Tau (RA = 05h39m30s.53, Dec = +26d22'26".3)
The object is fading since October 18 (vsnet-campaign-orion 36).
MisV1181 (RA = 22h58m09s.12, Dec = +66d21'12".4)
M. Collins reported negative observations with limit of 13.0mag on
2001 June 28 and October 8 (vsnet-campaign-nova 1135).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
The object again became fainter than 13.4mag since October 20.
T. Kato suspects that there may be a quasi-cycle of 30-40 d
(vsnet-campaign-unknown 120). It further faded to <14.7mag on
October 29 (vsnet-campaign-unknown 121). The faint state continues
(vsnet-campaign-unknown 122).
AG Dra (RA = 16h01m40s.98, Dec = +66d48'10".3)
The object is now slowly fading (vsnet-campaign-symbio 39).
NSV 10934 (RA = 18h40m52s.26, Dec = -83d43'10".24)
An outburst of 12.9mag was reported bu R. Stubbings on October 28
(vsnet-campaign-dn 2934, 2939).
IX Dra (RA = 18h12m32s.2, Dec = +67d04'41")
The object entered a rapid fading phase from the superoutburst
around October 30 (vsnet-campaign-dn 2935, 2944, 2947).
IP Peg (RA = 23h23m08s.7, Dec = +18d24'59".1)
The profile of the eclipse observed by K. Torii and the Kyoto team
is unusually deep for the eclipses during outbursts
(vsnet-campaign-dn 2936). The object hsa faded (vsnet-campaign-dn
2941, 2968).
Z UMi (RA = 15h02m01s.35, Dec = +83d03'48".7)
The object further faded. Some observations showed it to be in
12th mag (vsnet-campaign-rcb 82).
Z And (RA = 23h33m40s.02, Dec = +48d49'06".1)
The object further brightened (vsnet-campaign-symbio 40).
BL Lac (RA = 22h02m42s.86, Dec = +42d16'37".6)
The object slightly faded in the end of October, however still
very active (vsnet-campaign-blazar 281, 282, 283).
KK Tel (RA = 20h28m38s.46, Dec = -52d18'45".6)
An outburst of 14.4mag was detected by R. Stubbings on October
28. It may be a normal outburst of this new SU UMa-type star
(vsnet-campaign-dn 2938).
*** Future schedule ***
International Workshop -- Extremely High Energy Cosmic Rays --
November 5-6, 2002
at RIKEN (The Institute of Physics and Chemical Research), Japan
Suzuki Umetaro Hall (#52), South Area, Wako main campus
Contact to: workshop2002@euso.riken.go.jp
[vsnet-campaign-grb 8]
IAU Colloquium 194
"Compact Binaries in the Galaxy and Beyond"
17-22 November 2003, La Paz, Mexico
Contact Details
Web page: http://bufadora.astrosen.unam.mx/~iau194
Email: iau194@astrosen.unam.mx
[vsnet-campaign-sn 467]
[vsnet-campaign-xray 154]
Texas in Tuscany
XXI Symposium on Relativistic Astrophysics
Florence, Italy, December 9-13, 2002
For more information:
http://vsnet.arcetri.astro.it/~texaflor/
[vsnet-campaign-xray 142]
SUPERNOVAE (10 YEARS OF SN1993J)
22-26 April 2003, Valencia, Spain
Web site: http://vsnet.uv.es/2003supernovae/
[vsnet-campaign-sn 342]
[vsnet-campaign-sn 452]
*** General information ***
Nova Sgr No. 4
CCD image taken by S. Kiyota:
http://vsnet.milky.ne.jp/~meineko/CCD/nvSgr2002-4.jpg
[vsnet-campaign-nova 1125]
Spectrum taken by M. Fujii:
http://vsnet1.harenet.ne.jp/~aikow/v4744_sgr.gif
[vsnet-campaign-nova 1131]
SW UMa
Light curve taken by T. Hynek:
http://ostrava.astronomy.cz/endetails.php?id=129
[vsnet-campaign 1346]
AW Sge
CCD image taken by L. Cook:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/AW_Sge/awcook.gif
[vsnet-campaign-dn 2949]
CCD image taken by Y. Sano:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/AW_Sge/sano.jpg
[vsnet-campaign-dn 2950]
PU Per
CCD image taken by D. Starkey:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/PU_Per/starkey.jpg
[vsnet-campaign-dn 2961]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page