[vsnet-alert 11345] Re: [VSS-members] RE: [AVSON] EK TrA Bright Outburst

[Stan Walker]

Hi Peter,

A couple of old friends in these two stars. 

I had a look at ASAS3 for EK but the data there are not very helpful with nothing which resembles an outburst. A sound reason for visual measures. I seem to remember that it was a confusing field, with another star each side of EK which made it hard to observe with PEP. 

The GCVS gives a superhump period of 0.06492 which is attributed to Vogt and Semeniuk in 1980 but I thought that these had been observed well before this - probably before the Bateson article which was probably published about 1978 (the C76 was meant to refer to the year but they were always very late). We got a similar period at Auckland during one outburst, so there's not much doubt that they are supermaxima.

Warner was observing a lot of these stars in the 1970s and I thought he had picked up this one along with Z Cha rather earlier than 1980. But it was all a long time ago and the memory is vague.

Regards,
Stan

  ----- Original Message ----- 
  From: Peter F Williams 
  To: VSS Members ; vsnet alert ; cvnet outburst ; AVSON at yahoogroups.com 
  Sent: Sunday, July 19, 2009 12:48 AM
  Subject: [VSS-members] RE: [AVSON] EK TrA Bright Outburst


  BV Cen and EK TrA outbursts continue :

  CENBV    20090718.445    126    WPX
  TRAEK    20090718.449    109    WPX


  The current outburst of EK TrA appears to be bright and long, the star now remaining near maximum for at least 4 days.  Both Narrow and Broad maxima were identified by Frank Bateson (Publ 4, 1976 VSS RASNZ) where the variable remains brighter than mag 13 for some 3 days and 10 days, respectively but it is not clear from the visual data alone whether the broad maxima are true super maxima.  The current outburst would seem a good target for southern CCDs.

  Regards

  Peter Williams


    -----Original Message-----
    From: Peter F Williams [mailto:pfwilliams at onaustralia.com.au]
    Sent: Tuesday, 14 July 2009 11:40 PM
    To: AVSON at yahoogroups.com; cvnet outburst; vsnet alert
    Subject: RE: [AVSON] EK TrA Bright Outburst


    Further observations:

    ARAAT    20090714.513    128    WPX
    CENBV    20090714.475    125    WPX
    TRAEK    20090714.520    109    WPX
    TRAEK    20090714.545    109    WPX

    Regards

    Peter Williams
    Heathcote NSW



      -----Original Message-----
      From: AVSON at yahoogroups.com [mailto:AVSON at yahoogroups.com]On Behalf Of Peter F Williams
      Sent: Tuesday, 14 July 2009 9:54 PM
      To: cvnet outburst; vsnet alert
      Cc: AVSON VSONetwork
      Subject: [AVSON] EK TrA Bright Outburst





      The dwarf nova EK TrA is undergoing a bright outburst as per the following
      single visual observation:

      TRAEK 20090714.480 109 WPX

      Regards

      Peter Williams
      Heathcote NSW

      [Non-text portions of this message have been removed]



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