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[vsolj-alert 778] VSNET campaign weekly summary

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue May 30 01:56 JST 2000
To: vsnet-campaign
cc: uemura
Date: Tue, 30 May 2000 01:42:50 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 143] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  HS Vir
 
    The observation by A. Pearce on 21 May (14.2mag) indicated the outburst 
  of this SU UMa-type dwarf nova (vsnet-alert 4877, vsnet-campaign 121).  
  The last confirmed superoutburst of HS Vir occurred in 1999 May.  
  CCD time-resolved photometry by S. Kiyota on 24 May has confirmed the 
  presence of definite superhumps (vsnet-campaign 128). 
    The superoutburst is now ongoing.  The superhump evolution should be 
  studied through more time-series observations.

  
  BD Pav 

    A. Pearce and R. Stubbings reported the SS Cyg-type dwarf nova BD Pav
  occurred one of its relatively rare outbursts.  The last reported
  outburst occurred in 1998 November.  According to Barwig (Astron. Astrophs. 
  124, 287, 1983), the object is a grazing eclipser (depth 0.5 mag) with 
  a period of 0.1793015 d (vsnet-campaign 132). 
    Time-series photometry, especially in eclipses, are strongly urged.


  LX Ser

    The eclipsing novalike object LX Ser tends to vary in greater amplitudes 
  than in recent years (vsnet-campaign 141).  This may be a signature of 
  weak dwarf nova-type activity.  If the current activity leads to dwarf 
  nova outbursts, this eclipsing system may provide a unique opportunity to 
  investigate the disk structure of Z Cam-type dwarf nova.
    Careful and continued observations are strongly encouraged.


(continuous targets)
  XTE J1118+480

    The source have kept a gradual decline (~0.06mag/d) from long lasted 
  plateau (vsnet-campaign 116,124,138,139).  On 22 May, L. Cook 
  reported the light curve had changed to slower rise and faster (about 
  half of an hour) decline, and something precessing was guessed 
  (vsnet-campaign 112).  The data obtained by VSNET collaboration team 
  showed a relatively sharp humps on the sinusoidal curve (vsnet-campaign 
  135).
    It is still in bright state although decline started.  Continuous 
  observations are encouraged.


  CI Aql

    T. Kato reported the brightening trend during the general decline 
  was interrupted by the rapid, almost linear, fading by ~0.1 mag within 
  2+ hours on May 23 (vsnet-campaign 118).  Other than the general trend, 
  intra-night variation is likely present (vsnet-campaign 125).  In the 
  light curve obtained by S. Kiyota on May 24, the object showed a fading 
  of ~0.1 mag around the predicted secondary eclipse (vsnet-campaign 127).
  His observation on May 25 also confirmed the presence of short-term 
  variability, whose characteristics seem to be different from that 
  reported in early post-maximum stage (vsnet-campaign 129).
    The whole profiles of both the primary and secondary eclipse are 
  poorly unknown yet. 
  

  V359 Cen

    A fading rate from outburst is comparable to the superoutburst 
  fading (vsnet-campaign 119).  It is confirmed that the linear fading 
  continued till 25 May.  
    The current state should be confirmed.


  KK Tel
   
    The long outburst of KK Tel (suspected SU UMa-star) started a rapid 
  fading on 26 May (vsnet-campaign 133).  The duration of the outburst 
  exceeds 8 d, but the decline rate may look a little slower than that 
  of typical SU UMa-type superoutburst.


  RX J0640-24

    The presumable superoutburst of RX J0640-24 has entered the rapid 
  decline stage on 24 May (vsnet-campaign 131).  The rate of decline, 
  the duration of the plateau phase, the rate of rapid decline are all 
  characteristic to those of superoutbursts.  Now it is in quiescence.


  RX J1450.5+6403

    T. Vanmunster reported that this newly discovered SU UMa-type dwarf 
  nova entered the rapid decline phase after first detected superoutburst
  (vsnet-alert 4885).  He has collected a total of over 5000 observations 
  at 4 CBA stations.
    The potential re-brightening should be checked.


*** General information ***

  RX J0640-24
    The light curve obtained by W. Walker on May 19 can be seen in 
						[vsnet-campaign 114]
  HS Vir
    Previous preprints are available at:
	http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/HS_Vir
   and  http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/HS_Vir-2

  XTE J1118+480
    The light curves obtained by VSNET collaboration team can be seen at:
	http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/Xray/XTEJ1118/jd30-90lc.gif
    and http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/Xray/XTEJ1118/jd60-90ph.gif

    or  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/xtej1118-camp.html
    
  BD Pav
    eclipse ephemeris:  see [vsnet-campaign 140]

(This summary is reproduction free.)

Regards,
Makoto Uemura

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