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[vsolj-alert 776] VSNET Weekly Campaign Summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue May 23 04:29 JST 2000
To: vsnet-campaign
cc: uemura
Date: Tue, 23 May 2000 04:14:19 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 113] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  HT Cam 
    The outburst of a suspected SU UMa or IP, HT Cam = RX J0757.0+6306 
  was reported by T. Kinnunen and P. Schmeer on 15 May (vsnet-alert 4845,
  4846).  V. Simon reported it was back in quiescence and confirmed rapid 
  decline from outburst on 16 May.  The feature of this outburst agree 
  with the previous one (vsnet-campaign 77).  The decline rate is 
  very fast and possibly more than 5 mag/d.  Now it is in quiescence.

  V359 Cen

    R. Stubbings reported that the dwarf nova V359 Cen was undergoing 
  the third historical outburst on 15 May (vsnet-campaign 70).  The last 
  outburst was in 1999 July when the possible existence of superhumps 
  was reported.  From A. Pearce's observation on 17 May, a 0.5mag decline 
  within two days was revealed (vsnet-campaign 86), and then, the outburst 
  is ongoing now.  Time-resolved photometry is strongly encouraged.

  KK Tel

    This suspected SU UMa-type dwarf nova occurred a bright outburst 
  on 17 May (vsnet-alert 4860), and the outburst is ongoing now.
  Time-resolved photometry is strongly encouraged.

  CP Dra

    The outburst of this poorly studied dwarf nova was reported by 
  T. Vanumunster on 15 May (vsnet-campaign 89, vsnet-alert 4851).  
  It has shown rather rapid decline to quiescence on 18, 19 May 
  (vsnet-campaign 107).  Now it is in quiescence.

(continuous targets)
  RX J1450.5+6403

    The superoutburst is ongoing now.  R. Novak performed period analysis 
  using his data and provided the period of 0.0602(2)d on 16 May 
  (vsnet-campaign 71).  T. Vanmunster revised the superhump period to 
  0.0600(2)d using the data before 16 May obtained by CBA team 
  (vsnet-alert 4852).  He also reported a slightly increased superhump 
  period of 0.0606(5)d using the data obtained by J. Kemp on May 18/19 
  (vsnet-alert 4870).  The spectroscopic period of either 0.0588 or 
  0.0599 d was provided by Thorstensen (vsnet-alert 4848).  The quiescent 
  photometry obtained at Nyrola observatory team shows a sharp periodicity 
  at 0.0289 d which is pretty close to the half of the spectroscopic 
  period.  The feature is quite reminiscent of other short-period SU UMa 
  systems and possible eclipses are suggested (vsnet-campaign 81, 82).  
  D. Nogami analyzed their quiescent data just before the outburst 
  (7, 10, and 11 May) and provide a period estimation of 0.056 d 
  (vsnet-alert 4868).  In the data obtained by R. Novak, there are 
  significant QPOs superimposed on the fading branch of superhumps 
  (vsnet-campaign 83).  The QPOs are confirmed by T. Vanmunster 
  (vsnet-alert 4870).
    Time-series observations are encouraged to detect the superhump 
  evolution, late superhumps, and QPO during final decline.

  RX J0640-24

    The outburst is ongoing now.  W. Walker reported the possible 
  structure in his two hours light curve on 19 May, but the amplitude 
  is not more than 0.15 magnitudes (vsnet-campaign 97).  It was 
  suggested that the object entered a rapid fading phase from 20 May 
  (vsnet-campaign 104).  Further observations during this outburst
  are urged. 

  BZ UMa

    The rapid fading has been confirmed and no re-brightening has been 
  detected.  It is now in quiescence.

  CI Aql
    A. Pearce reported an appreciable short-term variability 
  (vsnet-campaign 80).  L. Kral's data revealed the object started to 
  brighten since May 12 (vsnet-campaign 84).  The object showed smoothly 
  fading from peak, which was interrupted by the brightening on 15 May 
  (vsnet-alert 4857).  The magnitude returned to 9.7mag, and then, 
  the object turned to decline from 18 to 20 May (vsnet-campaign 103).  
  Most recently, Kyoto team confirmed the linear 0.1mag rise in two hours 
  from the May 21 (vsnet-alert 4875).
    Time-series photometry, particularly around eclipses, are 
  strongly encouraged.

  XTE J1118+480
    L. Cook reported the slight decline (0.12 mag compared with that of 
  March 31) and the data obtained at Kyoto also shows this tendency 
  (vsnet-campaign 96, 98, and 102).  The ASCA data on May 11 (ASCA - VSNET 
  campaign) revealed a QPO at 0.115(2) (Hz), indicating the frequency 
  shifted from the previous value (vsnet-campaign 100).  Using the 
  last week data, the longer period of 0.1713 d and its smaller amplitude 
  of 0.05mag was reported in [vsnet-campaign 111].
    We should confirm whether the reported decline will continue or 
  interrupt by any other event.

*** General information ***

  V359 Cen
    coordinates,  see [vsnet-alert 3216]  
  CI Aql
    light curves obtained at Ostrava Observatory 
    eclipse ephemeris, see [vsnet-campaign 92]
  XTE J1118+480
    power spectrum of the X-ray light curve with ASCA
    preprint (R. I. Hynes et al. ApJ submitted) astro-ph/0005398

(This summary is reproduction free.)

Makoto Uemura
on behalf of VSNET collaboration team

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