[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]
[vsnet-campaign-news 186] News from VSNET
*** News from VSNET ***
Var73 Dra again shows a bright outburst.
AY Psc is found to be an eclipsing Z Cam-type dwarf nova.
For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.
---------------------------------------------------------------------------
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
----------------------------------------------------------------------------
The following was issued on December 9, 2002, as VSNET campaign
circulation 1352
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
V1028 Cyg (RA = 20h00m52.13s, Dec = +56d56'22.3")
An outburst (14.3mag) was reported by J. Pietz on December 8. The
last outburst was recorded in 2001 December (superoutburst). Most
of outbursts of this object are superoutburst, as in SW UMa
(vsnet-campaign-dn 3094).
AY Psc (RA = 01h36m55s.44, Dec = +07d16'29".7)
According to AAS 201 (40.07), AY Psc is found to be (probably the
first, except the rather atypical EM Cyg) eclipsing Z Cam-type dwarf
nova. Please observe this object closely (on nightly basis, as in
other DNe), and regularly monitor the eclipses. Catching the
ingress and egress phases of standstills is extremely important
(when such a phase is suspected, please use vsnet-alert to announce
the detection) in testing the theories of standstills
(vsnet-campaign-dn 3087).
NSV 15086 (RA = 00h24m52s.4, Dec = -01d53'34")
As reported by A. Pearce on December 7, the poorly known object
NSV 15086 = FBS 0022-021 experienced a brightening (14.8mag).
T. Vanmunster performed time-series observations for 2.6 hours on
Dec 8/9, and reported the resulting light curve showed no modulations
>0.1mag (vsnet-campaign-dn 3092). Although the exact classification
of this object has not been firmly established, confirmatory and
follow-up observations are encouraged (vsnet-campaign-dn 3038).
XTE J1450-603 (RA = 14h50m16s, Dec = -60d16')
According to ATEL #111, a new X-ray transient was discovered close
to Cir X-1 (vsnet-campaign-xray 171).
GY Cnc (RA = 09h09m50s.5, Dec = +18d49'47")
A possible outburst (14.7mag) of the deeply eclipsing dwarf nova,
GY Cnc was reported on December 3 by M. Simonsen (vsnet-campaign-dn
3068). The outburst was confirmed at V=13.5 on December 4.99 by
A. Oksanen (vsnet-campaign-dn 3072, 3077). The object has kept
brightening on December 8, which indicates a slowly rising outburst
(vsnet-campaign-dn 3095).
eta Gem (RA = 06h14m52s.87, Dec = +22d30'24".5)
S. Otero reported that the current fading of eta Gem is probably
not due to a semiregular pulsation cycle, but due to an eclipse
(vsnet-campaign-ecl 46, 47, 48, 49, 50, 51).
SN 2002ji (RA = 11h22m53s.15, Dec = +16d35'10".0)
NGC 3655, a host galaxy of SN 2002ji is a nearby spiral galaxy.
It is a probable member of a group LGG 237, which also contains NGC
3626 or NGC 3607. It is at the nearly same distance as the Virgo
cluster, so if it is typical unreddened SN Ia, it can reach mag 12.
But the discovery magnitudes (15.1mag) suggest that it is an old one
or a collapse-driven event (vsnet-campaign-sn 511). According to
IAUC 8026, the Baade telescope at Las Campanas spectrum on Dec. 3.3
revealed that it was of SN Ic around 1 month after maximum
(vsnet-campaign-sn 514). The Nordic Optical Telescope (NOT) at La
Palma spectrum on Dec 5.24 confirmed that it was a SN Ib/c, but it
seems to be near maximum (vsnet-campaign-sn 516).
CI UMa (RA = 10h18m13s.01, Dec = +71d55'42".8)
An outburst of 14.1mag was reported by M. Simonsen on December 3
(vsnet-campaign-dn 3069).
SX LMi (RA = 10h54m29s.93, Dec = +30d06'30".0)
An outburst of 13.5mag was reported by M. Simonsen on December 3
(vsnet-campaign-dn 3070) .
SN 2002jj (RA = 03h39m29s55, Dec = -13d06'55".8)
IC 340, a host galaxy of SN 2002jj is a lenticular galaxy.
The expected maximum for typical SN Ia is mag about 15.6.
Lenticular galaxies are believed to produce SNe Ia only. On the
other hand, the reported magnitudes (16.5mag) suggest that it does
not like SN Ia but it can be of type IIP in the plateau phase,
though it seems somewhat brighter than typical SNe II
(vsnet-campaign-sn 513).
SN 2002jk (RA = 10h44m14s.39, Dec = +15d58'09".9)
2MASXi J1044142+155817 = MAPS-NGP O_432_0631575, a host galaxy of
SN 2002jk is a dim galaxy (mag about 17). It is an old SN
(vsnet-campaign-sn 513).
V630 Cyg (RA = 21h34m59s.21, Dec = +40d40'18".5)
A possible superoutburst was detected on December 4
(vsnet-campaign-dn 3079). The outburst was confirmed on December 7,
which indicates that it is a genuine superoutburst
(vsnet-campaign-dn 3080).
V1113 Cyg (RA = 19h22m38s.62, Dec = +52d43'51".1)
A bright outburst was detected on December 4. It was confirmed
that the object was still bright on December 7, which indicates that
the current outburst is a superoutburst (vsnet-campaign-dn 3081).
(continuous targets)
Var73 Dra (RA = 20h23m38s.193, Dec = +64h36m26s.91)
From the Kyoto observation on December 6, the SU UMa-type dwarf
nova Var73 Dra was confirmed to be undergoing another outburst. The
brightness was comparable to that of the October superoutburst. If
the present outburst turns out to be a superoutburst, Var73 Dra may
be the first object having a supercycle length between usual SU UMa
stars and ER UMa stars (vsnet-campaign-dn 3082). T. Vanmunster
performed time-series photometry for 2.66 hours on Dec 8/9, and
reported that small scale variations were clearly present
(vsnet-campaign-dn 3093). The object was confirmed to be still
bright on December 9 (vsnet-campaign-dn 3098).
HV Aur (RA = 04h53m16s.8, Dec = +38d16'29")
The object was confirmed to have been in the superoutburst on
Dec. 2 (vsnet-campaign-dn 3066).
DX And (RA = 23h29m46s.72, Dec = +43d45'04".2)
The object reached the maximum in the early December
(vsnet-campaign-dn 3078).
BL Lac (RA = 22h02m42s.86, Dec = +42d16'37".6)
The object is reported to still show some activities
(vsnet-campaign-blazar 289).
V1159 Ori (RA = 05h28m59s.52, Dec = -03d33'52".8)
The superoutburst is still ongoing (vsnet-campaign-dn 3096).
V436 Cen (RA = 11h13m58.2s, Dec = -37d40'45".0)
The superoutburst is still ongoing (vsnet-campaign-dn 3067, 3086).
RX Cha (RA = 10h36m26s.33, Dec = -80d02'48".2)
Observations reported by T. Richards on December 3 indicated a
rapid decline. The outburst may be either a normal outburst or a
precursor-type outburst (vsnet-campaign-dn 3071, 3076).
RX And (RA = 01h04m35s.55, Dec = +41d17'58".0)
A new outburst was detected. It started on December 6 when it was
12.8mag as reported by T. Kinnunen, and then reached 11.4mag by
M. Simonsen. The outburst cycle may be unexpectedly short
(vsnet-campaign-dn 3085).
Z Cha (RA = 08h07m16s.29, Dec = -76d32'20".9)
A possible superoutburst was reported. It still continues
(vsnet-campaign-dn 3084, 3097).
MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)
The object brightened up on Dec. 1 images taken at the Kyoto
team. The fading episode from the end of November seems to be
slightly earlier than expected from the past (semi-?)periodicity
(vsnet-campaign-unknown 132). The observation by the Kyoto team on
December 6 revealed the next fading. It suggests that the fadings
are not strictly periodic, but quasi-periodic
(vsnet-campaign-unknown 137, 148, 150, 151). D. West reported that
de-reddened colors (UBV) of this object indicate a B-type star
(vsnet-campaign-unknown 133, 134, 135, 136, 139, 140). C. Lloyd
commented that it is quite likely that this is a binary, possibly
with some true periodic behaviour buried in the variations
(vsnet-campaign-unknown 138). Based on measurements by A. Henden,
the object gets redder in V-R and R-I, but bluer in B-V as it fades
(vsnet-campaign-unknown 139, 141). T. Kato commented that it is one
of the very signatures of deep Herbig Ae/Be-type fadings
(vsnet-campaign-unknown 142). J. Greaves mentioned that to measure
polarization would be important to determine whether the object is a
Herbig Ae/Be star or not (vsnet-campaign-unknown 143, 144, 145, 146,
147, 149).
V4743 Sgr (RA = 19h01m09s.38, Dec = -22d00'06".2)
M. Fujii reports a spectrum of V4743 Sgr taken on Nov. 23, which
shows a strong [O III] emission line. The object is apparently
entering the nebular phase (vsnet-campaign-nova 1147).
BX Mon (RA = 07h25m22s.7, Dec = -03d35'50")
BX Mon keeps the bright state at 9.5-9.6mag (vsnet-campaign-symbio
43).
SN 2002ia (RA = 01h45m38s.52, Dec = +24d08'07".9)
Accodring to IAUC 8027, it was a type Ia SN about 2-3 weeks after
maximum on Nov. 29.13. The redshift of SN 2002ia was measured as
about 0.072 (vsnet-campaign-sn 515).
SN 2002ib (RA = 00h54m07s.45, Dec = +17d33'53".7)
Accodring to IAUC 8027, it was also a type Ia SN about 10 days
after maximum on Nov. 29.10. The redshift of SN 2002ia was measured
as about 0.068 (vsnet-campaign-sn 515).
SN 2002jf (RA = 02h34m35s.43, Dec = +12d17'25".4)
Accodring to IAUC 8027, it was a type Ia SN about 2-3 weeks after
maximum on Nov. 28.19. The redshift of SN 2002ia was measured as
about 0.079. It was probably a luminous event (vsnet-campaign-sn
515).
SN 2002jh (RA = 04h27m29s.57, Dec = +06d01'34".2)
Accodring to IAUC 8027, it was one more type Ia SN about 10 days
after maximum on Nov. 28.23. The redshift of SN 2002ia was
measured as about 0.048. It was somewhat subluminous or reddened
(vsnet-campaign-sn 515).
SN 2002ic (RA = 01h30m02s.55, Dec = +21d53'06".9)
According to IAUC 8028, the Baade telescope spectrum (Nov. 29.11)
shows that it was a type Ia SN near the maximum. It is likely a
luminous one. The redshift is 0.066 (vsnet-campaign-sn 516).
*** Future schedule ***
WEBT campaign on Mkn 421
M. Villata announced possible WEBT campaign on Mkn 421, in
December 2002 and February-March 2003, to be carried out during
multifrequency campaigns.
The relevant information on the MW campaign of December 2-16 is at
the VERITAS site <http://veritas.sao.arizona.edu> .
[vsnet-campaign-blazar 287]
[vsnet-campaign-blazar 288]
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]
[vsnet-campaign-sn 512]
*** General information ***
V4743 Sgr
Spectrum taken by M. Fujii:
http://vsnet1.harenet.ne.jp/~aikow/v4743sgr_20021123.gif
[vsnet-campaign-nova 1147]
GY Cnc
Eclipse ephemeris, see [vsnet-campaign-dn 3073]
Charts and sequence presented by M. Simonsen:
http://joevp.20m.com/charts/henden/Her%20to%20Vul/
[vsnet-campaign-dn 3088]
RX Cha
Outburst image taken by P. Nelson:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/RX_Cha/nelson.gif
[vsnet-campaign-dn 3074]
Ourburst image taken by T. Richards:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/RX_Cha/richards.gif
[vsnet-campaign-dn 3075]
SN 2002jj
The KAIT discovery image:
http://astron.berkeley.edu/~bait/2002/sn2002jj.gif
[vsnet-campaign-sn 513]
eta Gem
Light curve provided by S. Otero:
http://ar.geocities.com/varsao/Curva_Eta_Gem.htm
[vsnet-campaign-ecl 46]
Z Cha
Eclipse ephemeris, see [vsnet-campaign-dn 3084]
AY Psc
Charts and preliminary sequence presented by M. Simonsen:
http://joevp.20m.com/charts/provisional/
[vsnet-campaign-dn 3089]
Var73 Dra
Charts and preliminary sequence presented by M. Simonsen:
http://joevp.20m.com/charts/provisional/
[vsnet-campaign-dn 3090]
NSV 15086
Charts and preliminary sequence presented by M. Simonsen:
http://joevp.20m.com/charts/provisional/
[vsnet-campaign-dn 3091]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page