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[vsnet-campaign 1269] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
HV Vir (RA = 13h21m03s.0, Dec = +01d53'28")
On 2002 January 4, P. Schmeer discovered an extremely rare
outburst of WZ Sge-type dwarf nova HV Vir at 12mag. The last
recorded outburst occurred in 1992 (vsnet-campaign 1262,
vsnet-campaign-news 120, vsnet-campaign-hvvir 3, vsnet-campaign-dn
2026, vsnet-campaign 1263, vsnet-campaign-hvvir 6). The outburst
was also confirmed in the late January 4 at Japan (vsnet-campaign-dn
2008, vsnet-campaign 1264, vsnet-campaign-hvvir 7, 8, 12, 13).
Time-series observations have been reported by K. Torii
(vsnet-campaign-hvvir 10, 18, 24, 29, vsnet-campaign 1267), G. Masi
(vsnet-campaign-hvvir 11, 23), S. Kiyota (vsnet-campaign-hvvir 19),
R. Novak (vsnet-campaign-hvvir 28), and T. Krajci
(vsnet-campaign-hvvir 31).
Possible early superhumps were reported in [vsnet-campaign-hvvir
16]. And, double-wave, low-amplitude modulations were clearly seen
in the S. Kiyota's run, thereby early superhumps were confirmed
(vsnet-campaign-hvvir 19). T. Kato reported the period of
0.05705(3) d, which clearly indicates that the modulations are early
superhumps (vsnet-campaign-hvvir 20, 25, 26, vsnet-campaign-dn 2030,
2031). The amplitude of the variations was 0.07 mag, and then
weakened. In the late January 4, the modulation was rather
dominated by a single wave (vsnet-campaign-hvvir 21, 25, 26,
vsnet-campaign-dn 2030, 2031).
On January 5, the modulations had a low amplitude (0.06 mag)
with a complex profile. These modulations were diminishing early
superhumps. On January 6, the object suddenly started showing
genuine superhumps, with an amplitude of 0.15 mag and well-defined
superhump-type profile. It may be either that the outburst started
a few nights before the initial detection, or that the development
of genuine superhumps is more rapid than in 1992 (vsnet-campaign
1268, vsnet-campaign-hvvir 33, 37).
The outburst is still ongoing (vsnet-campaign-hvvir 17, 22, 27,
30, 35).
SS UMi (RA = 15h51m22s.4, Dec = +71d45'11".1)
A superoutburst of SS UMi was reported at 13.7mag by M. Reszelski
on January 5 (vsnet-campaign-dn 2034).
HX Peg (RA = 23h40m23s.37, Dec = +12d37'44".0)
Recently reported observations indicate that the object may
have entered a standstill (vsnet-campaign-dn 2017), but soon faded
from this short standstill on January 3 (vsnet-campaign-dn 2033).
DE CVn (RA = 13h26m54s.2, Dec = +45d32'55")
T. Kato has written in [vsnet-campaign 1259] that this binary
consists of a (presumably) white dwarf and a M-type dwarf,
resembling that of a short-period pre-CV. The orbital light curve
(cf. IBVS 4486) bears strong resemblance to the enigmatic object
CW 1045+525 (cf. A&A 380, 533), which is proposed to be a secondary-
dominated dwarf nova. Observations are encouraged.
EC 04224-2014 (RA = 04h24m41s.1, Dec = -20d07'12")
According to the EC survey, a very bright CV (B=11.6-13.0) is
discovered (MNRAS 325,89). Observations are encouraged
(vsnet-campaign 1260).
HL CMa (RA = 06h45m17s.0, Dec = -16d51'35")
Observations reported during the last week imply it started to be
in a standstill (vsnet-campaign-dn 2023). A. Henden reported ~1 mag
fainter magnitude indicating any standstill appears to be over
(vsnet-campaign-dn 2027). Visual observations also show the fading
since January 3 (vsnet-campaign-dn 2032).
BX Mon (RA = 07h25m22s.7, Dec = -03d35'50")
Observations reported by H. Maehara show the object may brighten
to 11.6mag on December 22 and confirmed on January 1
(vsnet-campaign-symbio 4).
S5-0716+71 (RA = 07h21m53s.4, Dec = +71d20'36")
The object has been reported to be relatively bright
(vsnet-campaign-blazar 241).
eta Car (RA = 10h45m03s.65, Dec = -59d41'03".7)
According to J. Garcia, eta Car may have brightened (4.8mag)
on January 3 (vsnet-campaign-sdor 1), and it was confirmed on
January 4, 5, and 6 (vsnet-campaign-sdor 2, 3, 4). Contrary to
these observations, S. Otero report that his observations show no
major brightening recently (vsnet-campaign-sdor 5).
UW Cen (RA = 12h43m16s.6, Dec = -54d31'37")
The object is slowly brightening. The current magnitude is
about 13.7mag (vsnet-campaign-rcb 9).
(continuous targets)
HT Cam (RA = 07h57m01s.2 Dec = +63d06'00")
After the rapid fading from the last bright outburst, the object
has remained relatively calm (vsnet-campaign-ip 73, vsnet-campaign-dn
2016). The long-period wave (close to the orbital period) persisted
until nearly 4 mag below the maximum. The best period determined
from the available observations is 0.064 d. The short-term
modulations (IP pulses, or QPOs?) were strong when the system was
between 14 and 15. Later on, these modulations became less
prominent, although the corresponding signal persisted
(vsnet-campaign-ip 74, vsnet-campaign-dn 2018). Mean decline rate
of HT Cam on Dec. 30 was 4.8 mag/d (vsnet-campaign-ip 75,
vsnet-campaign-dn 2019). During the decline phase, there is an
indication of two different stages of decline. The first part
resembles that of a plateau portion of a dwarf nova outburst, with a
slower decline, low amplitude of orbital (or superhump) signals, and
low amplitude of the 8 min signal. The latter part, which we have
been mostly referring to, shows much more rapid decline, large
amplitudes of orbital (or superhump) and 8-min signals
(vsnet-campaign-ip 77, vsnet-campaign-dn 2021). The data obtained
on December 31 show the fading seems to have stopped. Both
modulations seem to persist (vsnet-campaign-ip 78, vsnet-campaign-dn
2022, vsnet-campaign-ip 79, vsnet-campaign-dn 2024). T. Kato
analyzed the post-outburst light curve and reported that the 8-9 min
modulations have a rather broad power spectrum, suggesting that the
modulations have a nature of quasi-periodic oscillations (QPOs)
(vsnet-campaign-ip 81, vsnet-campaign-dn 2025). After retaining a
post-outburst plateau for three days, HT Cam started to fade again
on January 3 (vsnet-campaign-dn 2029, vsnet-campaign-ip 82). On
January 4, the dominating periodicity has changed to be 0.041 d.
The period is diffenrent from the orbital period or periods of
oscillations seen during and after the outburst (vsnet-campaign-dn
2036, vsnet-campaign-ip 83).
3C 66A (RA = 02h22m39s.6, Dec = +43d02'08")
The object is reported to be slightly active
(vsnet-campaign-blazar 240).
SN 2001el (RA = 03h44m30s.57, Dec = -44d38'23".7)
The object keeps gradually fading (vsnet-campaign-sn 306).
RR Tau (RA = 05h39m30s.53, Dec = +26d22'26".3)
As reported by G. Poyner, the object further faded
(vsnet-campaign-orion 2), and then seems to have passed the minimum
around 13.5mag on December 31 (vsnet-campaign-orion 3). The object
brightened to the 12th mag until January 5, and possibly faded
(vsnet-campaign-orion 4).
OW Gem (RA = 06h31m41s.78, Dec = +17d04'56".0)
On the ingress of an eclipse, the fading rate became faster and
faster with time and reached a minimum around January 3
(vsnet-campaign-ecl 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17),
and then the recovering from the eclipse was reported on January 4
(vsnet-campaign-ecl 18, 19, 20, 21).
V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)
Reported observations show that the object has rlatively been calm
at an intermediate brightness of about 14.3mag (vsnet-campaign-dn 2035).
DY Per (RA = 02h35m17s.12, Dec = +56d08'44".7)
The slow fading continues (vsnet-campaign-rcb 8).
delta Vel (RA = 08h44m42s.1, Dec = -54d42'30")
S. Otero reported observations of a secondary eclipse on 2002
January 2, and the period of 45.1501 days (vsnet-campaign-deltavel
38).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
The Y. Atobe's observation on January 2 may indicate it has faded
to be 2.1mag (vsnet-campaign-be 150). On the other hand,
S. Sakuma's observation on January 5 show it is still bright at
1.7mag (vsnet-campaign-be 151).
SN 2001ig (RA = 22h57m30s.69, Dec = -41d02'25".9)
This supernova brightened to the 12th mag (vsnet-campaign-sn 307,
308).
TV Col (RA = 05h29m25s.5, Dec = -32d49'05".2)
Reported observations show that the object has recently remained
calm (vsnet-campaign-ip 80).
V1039 Cen (RA = 13h55m41s.27, Dec = -64d15'57".9)
The object keeps slow fading (vsnet-campaign-nova 667).
*** Future schedule ***
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]
*** General information ***
HV Vir
VSNET page for the current outburst:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/hvvir.html
[vsnet-campaign-hvvir 36]
QSOs near the object, see [vsnet-campaign-hvvir 5]
Recommended comparison stars, see [vsnet-campaign-hvvir 4]
[vsnet-campaign-dn 2026]
[vsnet-campaign 1263]
[vsnet-campaign-hvvir 6]
Outburst CCD image:
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/HV_Vir/hvvir.gif
[vsnet-campaign-hvvir 9]
Field photometry presented by A. Henden:
http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/hvvir.dat
[vsnet-campaign-hvvir 32]
Charts provided by A. Price:
http://vsnet.aavso.org/charts/standard/VIR/HV_VIR/
[vsnet-campaign-hvvir 34]
HT Cam
Data presented by G. Billings:
http://vsnet.telusplanet.net/public/obs681/HTCmmc29.txt
http://vsnet.telusplanet.net/public/obs681/HTCmmc29.gif
[vsnet-campaign-data 85]
[vsnet-campaign-ip 76]
[vsnet-campaign-dn 2020]
New EC CVs:
(2000.0) catalog range
EC04030-5801 040405.73 -575327.3 UG 14.7-<18B
EC04224-2014 042441.06 -200711.5 NL 11.6-13.0B
EC05114-7955 050753.62 -795124.0 UG: 15.1B-
EC05287-5857 052928.66 -585446.5 NL 14.3-<18B
EC05565-5935 055712.65 -593525.9 NL 14.2B-
EC10565-2858 105856.40 -291440.7 UG: 14.9-16.3B
EC20335-4332 203654.57 -432231.3 UG: 14.9-15.9B
[vsnet-campaign 1261]
New list: [vsnet-campaign-hvvir]
Following the recent development of the object-oriented approach
in computer science, we have set up a new list for the present
rare outburst of HV Vir.
[vsnet-campaign-hvvir 1]
[vsnet-campaign 1265]
[vsnet-campaign 1266]
[vsnet-campaign-hvvir 14]
[vsnet-campaign-hvvir 15]
New list: [vsnet-campaign-ccd-discussion]
This list is dedicated to exchange information on CCDs and
associated techniques, data analysis softwares for conducting
VSNET campaigns. Please feel free to use the list for sharing
information.
[vsnet-campaign-ccd-discussion 1]
(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