[vsnet-alert 6264] Re: WZ Sge: nature of the dip

[Taichi Kato <tkato>]

Re: WZ Sge: nature of the dip

Dear Masi and Colleagues,

> >     It looks like that the precessed disk was most favorably situated
> > for eclipses at the time of Kyoto observation. 
> 
> Could this "geometric" factor explain why, on my Aug. 09/10 
> run, I had a very clear vision of those ecplises, where in 
> other sessions they were weaker?

   Probably.  It is widely believed that superhumping SU UMa-type disk
is elongated; it may be that eclipses are strong when the axis is
favorably oriented so that a bright point is eclipsed.  However, more secure
interpretation deadly requires additional observations.  Remember that
the present observation makes the first-ever detailed coverage of this
stage of a WZ Sge outburst, and the nature of WZ Sge-type outbursts has
much mystery both in theories and observations.  In fact, we may be
witnessing the emergence of a completely new phenomenon, which was not
recorded in the 1978 outburst!

Regards,
Taichi Kato
VSNET Collaboration team

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