[vsnet-chat 1883] Re: Perplexing questions, UV delay?

[Taichi Kato <tkato>]

Re: [vsnet-chat 1882] Re: Perplexing questions, UV delay?

Dear Justin,

> in your reply, you made reference to ( UV time delay
>  between simultaneous satellite and visual observations). Forgive
>  me if I make a few assumptions, but I presume the time delay is
>  to visual observers, and the delay of the UV component somehow
>  effects our visual observations?
>  If so, is our atmosphere the mechanism that causes time
>  delay?

    UV-delay in dwarf novae: even more preplexing, dwarf nova outbursts
occur in the visual light earlier than in the UV light.  Usually one day
after our familiar visual rise (e.g. VW Hyi), the UV light starts to rise.
This it not caused by our atmosphere, but intrinsic to these stars.

    This has been one of the central questions about the outburst mechanism
of dwarf novae.  Successful outburst models must reproduce this time delay.

Regards,
Taichi Kato

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