[vsnet-chat 35] Re: EG Cnc - first one?

[Fraser Farrell <fraserf@dove.net.au>]

On 1997-02-06 rudolfn@physics.muni.cz said:
   >I have one question about strange behavior of EG Cnc. Can someone
   >help me? I would like to ask you, if some star before EG Cnc showed
   >this unusual light curve or if EG is first one. And of course can
   >we explain it? Right now I don't have any idea how to.
   >I am preparing a few sentences to our magazine Diskobolos and would
   >know some opinions. I am looking forward to receive some answers
   >thank you very much and have a nice dreams

G'day Rudolf,

Hypothesis to explain EG Cnc:  it's being attacked by aliens ;)

I would have liked to observe this one for myself, but looking through
the top of Adelaide's skyglow at 13th mag stars is a bit difficult for
me. However, there seems to be a similar star in the other direction
where my sky is dark - WX Hydri.

The VSS RASNZ Circulars for October & November arrived this week.
Here's some more information about that odd superoutburst of WX Hyi:

JD of maximum
  2450000+      duration (rise-peak-fall) days     magnitude
-----------     ------------------------------     ---------
 363                2.9 - 5.0 - 5.7   (supermax)     12.0
 380                1.1 -     - 0.9                  12.5
 386                1.4 - 0.7 - 1.0                  12.5
 394                1.2 - 0.2 - 2.3                  12.4
 406                2.0 -     - 1.                   12.8
 416  (Nov 28)      1.8 - 1.  - 1.1                  12.0

And some dates from my own notes for 1996 December:
   outburst    - 10th(?)
   no outburst - 12th, 30th, 31st

How many of those maxima represent re-brightenings of a superoutburst?
Maybe all of them?  WX Hyi certainly didn't "slow down" after the
superoutburst like many other UGSS's would have!  In fact it may be even
more active than indicated; there has been a lot of cloudy weather in
the Southern Hemisphere lately.

WX Hyi's frequency of outburst was about 2 or 3 times per month a few
years ago, and outbursts were typically less than 2 days long.  Even its
superoutbursts lasted no more than a week.  Now it is going off more
frequently, and for longer maxima. Taichi Kato seems to be right in
suggesting WX Hyi is trying to join "The ER UMa Club".

I presume you are writing about these hyperactive ER UMa dwarf novae, so
why not post your Diskobolos article to vsnet-chat?  I would like to
read it please....


cheers,
Fraser Farrell
Variable Stars Group
Astronomical Society of South Australia

WWW: http://vsnet.gist.net.au/assa/   email: fraserf@dove.net.au
traditional:  GPO Box 199, Adelaide, SA 5001, Australia


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