[vsolj-alert 783] Weekly news from VSNET

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Jun  6 05:25 JST 2000
To: vsnet-campaign
cc: uemura
Date: Tue, 06 Jun 2000 05:11:19 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-campaign 175] VSNET Weekly Campaign Summary
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  V893 Sco		(RA = 16h14m45.26s, Dec = -28d39m30.3s)

    As reported by B. Monard on 29 May, the eclipsing dwarf nova below 
  the period gap, V893 Sco occurred an outburst (12.7 mag on 29 May) 
  (vsnet-campaign 147).  The fading was confirmed on 31 May.  
  The outburst was likely a normal outburst (vsnet-campaign 153).
    

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

    The helium dwarf nova V803 Cen occurred a bright outburst 
  (13.4 mag on 1 June) (vsnet-campaign 158).  The further brightening 
  (12.6 mag) was confirmed through the observation by A. Pearce 
  on 2 June.  It indicates the outburst is a superoutburst 
  (vsnet-campaign 163).  The object is now in outburst.
    No time-series observation is reported in vsnet-campaign.  
  The variation on this outburst should be confirmed.


  V2051 Oph		(RA = 17h08m19.1s, Dec = -25d48m31.1s)

    The observation on 2 June by P. Williams showed this eclipsing 
  SU UMa-type dwarf nova was slightly brighter than quiescence 
  (14.3 mag on 2 June) (vsnet-campaign 161), however, the observation 
  by A. Pearce, >14.5mag on 2 June,  indicates it was no major outburst 
  (vsnet-campaign 165).  


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

    As reported by J. Pietz, the SU UMa-type dwarf nova V660 Her 
  occurred a superoutburst (14.34 mag on 2 June), and he also detected 
  two humps with the amplitude of ~0.2 mag and the period of ~0.073 d 
  (vsnet-campaign 166).  The object is now in superoutburst.
    More observations are urged to study the superhump evolution.


(continuous targets)
  CI Aql		(RA = 18h52m03.6s, Dec = -01d28m38.9s)

    Between May 29.59 and 29.80 UT, T. Kato reported a short-term 
  variation, fading and rising, was present in the combined data observed 
  by Kyoto team and S. Kiyota (vsnet-campaign 146).  The object continued 
  to fade after the peak on May 23 (vsnet-campaign 160), and then, has 
  shown more rapidly fading since about 1 June (vsnet-campaign 168).  
  The decline rate reached 0.3 mag/d.  On the declining trend, an 
  eclipse-like feature was present around (slightly earlier) the predicted 
  secondary eclipse (vsnet-campaign 171).  
    The eclipses will be able to clear in this rapid decline.  
  The observations on any phase are encouraged. 


  HS Vir		(RA = 13h43m38.5s, Dec = -08d14m04.1s)

    HS Vir was reported at 15.0 on 4 June, at the terminal stage of the 
  current superoutburst (vsnet-campaign 173).


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

    The outburst seems to become considerably longer than the 1998 one 
  (vsnet-campaign 164).  It is now in outburst. 
    The outburst lasts for at least 10 days.  Is this an outburst of 
   a SS Cyg-type dwarf nova?  Time-series photometry is strongly urged.

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

    Using the data observed by VSNET collaboration team between 
  JD 2451690 and 2451699, the period of 0.1703(1) was calculated 
  (vsnet-campaign 174).  The hump is still prominent and the short time 
  fluctuations are also present.  In this period (JD 2451690 - 2451699), 
  the data shows no significant decline trend (vsnet-campaign 169). 
    No one can predict the future activity of this X-ray nova. 
  More observations are encouraged.


*** General information ***

  V893 Sco
    eclipse ephemeris, see [vsnet-campaign 148]

  CI Aql
    eclipse ephemeris, see [vsnet-campaign 159]

(This summary is reproduction free.)

Regards,
Makoto Uemura

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