[vsnet-alert 9592] Re: V455 And = HS2331+3905 superhumps and eclipses

[Erik Kuulkers]

Dear all,

Such light curves, varying greatly from night to night, especially in 
the beginning
of the superoutburst, are also nicely seen in superoubursts seen from other
eclipsing SU UMa systems, such as Z Cha and OY Car.
Note that the dip-like features in the light curves might be due to 
outer disk rim
material, obscuring the inner parts of the accretion disk and white 
dwarf region.

Regards,

Erik

Taichi Kato wrote:

>V455 And = HS2331+3905 superhumps and eclipses
>
>   As reported by Maehara-san, eclipses (depth ~0.1 mag) are
>indeed superimposed on superhumps.  The eclipses seem to appear
>stronger when they are located before the superhump rise (Sep. 16),
>and decline from the superhump maximum (Sep. 14).  The eclipses
>became less prominent when they are on the rising branch of
>superhumps (Sep. 15).  The earlier rather unusual, dip-like light
>curve (Sep. 12 and 13) were likely composed of eclipses and evolving
>superhumps (and diminishing early superhumps?)
>
>   The primary maxima of early superhumps were situated at
>phase 0.6 against the current eclipse ephemeris.  The minima
>of early superhumps occurred at around phase -0.1, which
>might have been related to displaced eclipses.
>The narrow dip-like features observed on Sep. 10 and 11
>were apparently unrelated to the current eclipses.
>
>See WZ Sge 2001:
>http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/wzsge01.html
>for comparison esp. in relation to eclipses and superhumps
>
>   QPO-lile modulations (relatively large-amplitude) are also
>superimposed on superhump light curves.
>
>   Further detailed analysis will be presented by Maehara-san.
>  
>

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