[vsnet-chat 85] Re: EG Cnc - first one?

[Taichi Kato <tkato>]

Fraser Farrell wrote:

> I speculate that EG Cnc may represent an extreme example - decades of
> inactivity, then months (years??) of vigorous activity, then inactivity
> again.  Perhaps this should be part of the definition of ER UMa stars?
> I await discussion from our professional readers!

    I believe the ER UMa stars are defined by their short supercycle
lengths, and not by activity/inactivity cycles.  ER UMa stars are assumed
to have exceptionally high mass-transfer rates among SU UMa-type dwarf
novae, in contrast to EG Cnc or WZ Sge-stars.  However, it is still
under investigation whether secular changes exist in ER UMa stars.

    I hope Nogami-san has some comments on this matter.

Regards,
Taichi Kato

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