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[vsolj-alert 969] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@ooruri.kusastro.kyoto-u.ac.jp  Tue Jan  8 05:06:16 2002
Delivered-To: tkato@kusastro.kyoto-u.ac.jp
Delivered-To: vsnet-campaign@kusastro.kyoto-u.ac.jp
To: vsnet-campaign@kusastro.kyoto-u.ac.jp
Date: Tue, 08 Jan 2002 05:06:05 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 1269] VSNET Weekly Campaign Summary
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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

  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, 

  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 
					[vsnet-campaign-xray 98]
					[vsnet-campaign-xray 104]

*** General information ***

  HV Vir
    VSNET page for the current outburst:
				      [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:
				      [vsnet-campaign-hvvir 9]
    Field photometry presented by A. Henden:
				      [vsnet-campaign-hvvir 32]
    Charts provided by A. Price:
				      [vsnet-campaign-hvvir 34]

  HT Cam
    Data presented by G. Billings:
					[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 
					[vsnet-campaign-ccd-discussion 1]

(This summary can be cited.)	

Makoto Uemura

VSNET Home Page

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