Reply To: CG Dra: a VSS campaign

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Maxim Usatov

Eclipses No(s): 107
State: Outburst or the beginning of a Bright Outburst

I’m still here, just that the weather doesn’t really help. CG Dra is visible for only a few hours until it sets too low at about midnight. This coming week, I think, is going to be very important, as this dwarf nova will go into its fourth bright outburst since this continuous light curve effort started, and it would be nice to understand if bright outbursts are indeed as periodic as they seem.

This appears to be a symmetric eclipse, but the orbital hump “iceberg” visible here is of almost 0.2 magnitude amplitude, which is quite odd. In this state CG Dra profile should be accretion disk-dominated, as it’s hot and ionized. As the bright spot supposed to be of constant flux due to the constant mass transfer in the widely accepted outburst model, it shouldn’t appear here at all. I wonder if we are looking at an increased mass transfer episode here, and if so, is this something that triggers bright outbursts?


  • This reply was modified 2 months, 1 week ago by Maxim Usatov.