What I was getting at is that the SO doesn't seem to affect the intervals
of normal outbursts (NO) in the way you would expect. The NO interval does
appear to shorten as a result of the SO but it's wrong to involve the SO in any
way in the NO interval timing. So for the NO interval you should measure from
the peak of the NO which initiated the SO (the precursor) to the peak of the
outburst foillowing the SO. With WX Hydri the NO are so frequent that you could
almost expect a NO (a partial disc collapse) to occur whilst the SO was still in
progress!!
I'm still puzzled by this 'clean out' comment. The only time a 'clean out'
occurs is in the nova explosion and this is a completely different
phenomenon. Perhaps the confusion arises because of the term 'disc collapse'. At
best, only a small part of the disc is involved in the collapse - otherwise it
would take a very long time for the disc to be recreated after
outbursts.
----- Original Message -----
Sent: Thursday, November 16, 2000 10:45
PM
Subject: [vsnet-chat 3772] WX Hyi
behaviour
Hi Stan,
thanks for asking..
My point was that there was no time delay of more than a couple of hours
between the last s/outburst and the next normal outburst (or whatever looked
like it). A s/outburst is usually seen as a cleanout phase of the accretion
disk and therefore one would expect some time delay to built up a new
accretion flow before the next (normal) outburst.
BTW the nova phenomenon relates to the 'clean-out' on the WD surface, not
the accretion disk.
The fact that the s/outburst took place immediately after the previous
normal outburst is not unique and seems to occur more often incl in other
systems.
I cannot reply on Taichi's behalf..
Regards,
Berto
>>> "Stan Walker" <astroman@voyager.co.nz>
11/15/00 09:08PM >>>
Hi Berto,
I noticed your question and TK's reply. But both of you know what the
dates and durations were - the rest of us don't. So I'm not sure what TK is
really saying, or what you're asking. Could you elaborate a little? I
think the interval you should be considering is between successive normal
outbursts - the superoutburst is a completely different event which - from an
observational viewpoint - doesn't affect the normal outbursts much. There
seems to be a shortening of the cycle and a reduction in amplitude, but this
is not as evident in the systems with fewer normal outbursts.
What is this 'complete cleaning' phase you mention involving hydrogen?
This seems more of a nova phenomenon.
Regards,
Stan
----- Original Message -----
Sent: Wednesday, November 15,
2000 7:15 PM
Subject: [vsnet-chat 3767] WX
Hyi behaviour
Hi,
WX Hyi has just shown the following sequence of events in
succession
1. normal outburst
2. superoutburst
3. another normal (?) outburst, ongoing at this moment.
Phases 1 and 2 do occur in succession with other systems too.
However event 3 seems a bit out of phase. The going theory spells that
the superoutburst is the 'complete cleaning' phase, iow all H is burned
away.
What happens to WX Hyi then for it still to have another outburst? Is
it unstable mass transfer by the secondary triggered by the past s/outburst
or is it due to another unrelated activity?
Do I hear 'flickering'?
Regards,
Berto Monard
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