[vsnet-alert 5594] V344 Ori

[Taichi Kato <tkato>]

V344 Ori

> This kind of 1-hour scale, large amplitude modulations and irregularities,
> and the corresponding ~0.12d periodicity are indeed not very frequently
> observed in erupting dwarf novae, as far as I know and can deduce from my
> CCD observations over the past 5 years. There's one very similar case
> however, call it a 'twin' of V344 Ori, that comes to my mind, and that's
> V405 Vul (S 10943).

  [...]

> I think it would be worthwhile to give some priority to both objects in
> terms of next outburst coverage. Moreover, they are an ideal 'couple', as
> one is primarily a Summer target and the other a Winter target.

   In terms of the outburst characteristics, V344 Ori satisfies all the
classical criteria of SU UMa-type dwarf novae: the presence of fewer long,
bright outbursts in addition to more numerous short outbursts.
The duration and the fading trend of the present outburst seem to
be comparable to those of other SU UMa-type superoutburst.  The exceeding
brightness of the present outburst is unlike other long outbursts, sometimes
observed in SS Cyg stars (as in U Gem).

   The presence of relatively large-amplitude modulations with a time-scale
close to other SU UMa-type superhumps seems to suggest that a similar
mechanism can be taking place.  The time-scales are unlike those of
(relatively short-period) QPOs in other novalike CVs.  We may add another
example of EP Car, for which Gordon Garradd recorded similar variations
during the 2000 February long outburst (cf. vsnet-alert 4245).
Perhaps we must learn (both observationally and theoretically) more about
these "atypical" or "poorly documented" bahevior from these objects.

   The outburst of V344 Ori still continues, and let's continue the
present coverage -- outbursts of V344 Ori are relatively rare, and the
one at this brightness was never met in the past.  We may have to wait
another decade to record a similar outburst, if we miss the present one!

Regards,
Taichi Kato
VSNET Collaboration team

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