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[vsolj-alert 786] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Jun 13 03:23 JST 2000
To: vsnet-campaign
cc: uemura
Date: Tue, 13 Jun 2000 03:08:34 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 202] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  V493 Lyr		(RA = 19h01m31.9s, Dec = +42d54m46.5s)

    G. Poyner reported the outburst of V493 Lyr at 14.2mag on June 6 
  (vsnet-alert 4949).  The last recorded outburst occurred during August 
  1999.  G. Hanson confirmed the outburst (vsnet-alert 4950).  
  T. Vanmunster observed on June 07/08 and the resulting light curve 
  is extremely flat, showing no variability and definitely no superhump 
  structure.  He also noticed that it did not exclude of course the 
  development of superhumps over the next days (vsnet-campaign 193).
    The outburst is now ongoing.  Time-series observations are encouraged 
  to study the short time modulation.

(continuous targets)
  V803 Cen		(RA = 13h23m44.5s, Dec = -41d44m30.1s)

    William S G Walker successfully detected the superhumps during this 
  superoutburst (vsnet-campaign 176).  In vsnet-campaign 201, he posted 
  light curves from Farm Cove (Jennie McCormick and Fred Velthuis) and 
  Wharemaru (Stan Walker) which illustrate the strongly periodic 27 minute 
  signal.  It has suddenly faded from 13.0mag on June 7 to 14.1mag 
  on June 8 (vsnet-campaign 192), and then, as reported by R. Stubbings 
  and A. Pearce, it has rebrightened up to 13.4mag on June 11 
  (vsnet-campaign 198).  According to the Walker's report, it seems 
  that the star may now have recovered to the bright level where it 
  cycles between 13.4 and 14.8 over a period of 22 to 24 hours.  
  In 1999 and 2000 there were indications that this cycling period may 
  have become even shorter (vsnet-campaign 201).
    Superhump phasing observations are very important at this stage  
  of outburst.  Observations are strongly requested.
  CI Aql		(RA = 18h52m03.6s, Dec = -01d28m38.9s)

    From the data on June 5 by Kyoto team, the object rose by 0.25 mag 
  in 1.5 hour and the time of eclipse-like minimum corresponds to the 
  predicted primary eclipse.  This observation may indicate the growing 
  eclipse feature as the system fades (vsnet-campaign 178).  The rapid 
  fading trend has apparently stopped on June 6.  Smooth variation was 
  present on the June 6 light curve, whose light maximum closely 
  corresponds to the binary phase 0.75 (vsnet-campaign 184).
  The fading trend is again apparent on June 7 (vsnet-campaign 187).
    In this phase, clear eclipses are expected.  Time-series photometry 
  is strongly encouraged.

  V660 Her		(RA = 17h42m07.3s, Dec = +23d47m37.3s)

    The superoutburst continues.  It keeps gradual fading but still bright 
  on June 10 (15.1mag) (vsnet-campaign 200).  The superhump (or possibly 
  late superhump) should be observed. 

  XTE J1118+480		(RA = 11h18m10.9s, Dec = +48d02m12.9s)

    The object again show the slight fading trend from short plateau 
  (vsnet-campaign 183).  This fading trend has apparently become slower 
  again (vsnet-campaign 197).
    The object is still bright and the humps are prominent.  To study 
  the period change, more observations are encouraged.

  BD Pav		(RA = 18h43m12.0s, Dec = -57d30m45.1s)

    The eclipsing dwarf nova BD Pav has finally entered the decline stage
  from the current rare outburst since June 10 (vsnet-campaign 196).  
  On June 11, it kept fading to quiescence (vsnet-campaign 199).
    We should keep attention to detect the possible rebrightenings.

*** General information ***

  BD Pav
    eclipse ephemeris, see [vsnet-campaign 180] and [vsnet-campaign 196]

  V803 Cen
    the light curve sent from William S G Walker, see [vsnet-campaign 201]

(This summary is reproduction free.)

Makoto Uemura

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