[vsnet-alert 4197] Re: SW UMa rare outburst

[Daisaku Nogami <nogami@satsuki.kusastro.kyoto-u.ac.jp>]

Dear colleagues,

 From: "Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>
 Date: Sat, 12 Feb 2000 03:57:16 +0100
 Subject: [vsnet-alert 4190] SW UMa rare outburst : another interesting CCD photometry target

 > too is an interesting target for CCD observers. During the April 1996 =
 > superoutburst of this system, Nogami (et al) observed some interesting =
 > phenomena, which are worthwile restudying and/or confirming :
 > - large-amplitude superhumps with a period of 0.0582 d only=20
 > - small-amplitude QPO's
 > - very pronounced super-QPO's with an extra-ordinary large amplitude of =
 > 0.2 mag=20
 > - clear increase in Pdot (superhump period) value in course of outburst

Yes, restudy of these phenomena is quite important!  Especially,
detection of super-QPOs (Kato et al. 1992, PASJ 44, L216) are
desired, since super-QPOs are supposed to exist only during the
very early phase of the superoutburst (see Nogami et al. 1998,
PASJ 50, 297, also available via the URL,
http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/SW_UMa/).
The timescale of super-QPOs is 5-6 minutes.  So I would recommend
you to try to make the time resolution as short as possible.

The variation of the superhump period is another interesting
topic regading the disk instability theory.  The multi longitudinal
coverage like the recent VSNET collaborations on QY Per, IY UMa,
and so on, is highly encouraged.

Best regards,
Daisaku Nogami

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