[vsnet-pn 2] Re: V651 Mon-like variables?

[Taichi Kato <tkato>]

Re: V651 Mon-like variables?

> 1- What is the story behind V651Mon? Are there more PN like it that are
> observable by amateurs?

    V651 Mon is a close binary star.  One of recently accepted models
are occasional passing of circumstellar clouds in front of the binary.
The A-type companion emits most of the visual light.  Binary motion
behind the inhomogenious cloud is proposed to cause the 16-d modulation
during fading episodes.

    I don't know there is a similar system to V651 Mon, but PNe with
binary central stars may have a chance to show similar phenomenon.

    Disregarding the mechanism, QV Sge = IC 4997 is an imteresting variable
planetary nebula, yes, the nebula itself!

Regards,
Taichi Kato

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