CCD Observations of the UGWZ-type dwarf nova V455 And = HS2331+3905

Below are my CCD observations of the dwarf nova V455 And, obtained during its famous superoutburst of September 2007.

2007, Sep 21/22

Superhumps becoming less prominent, and more low-amplitude oscillations.


2007, Sep 19/20

Short run again due to clouds.


2007, Sep 18/19

Short observation session (clouds), but superhump(s) still very prominent.


2007, Sep 16/17

Light curve of Sep 1
6/17, 2007 in unfiltered light. Clear skies, though not photometrically good.  Superhumps still strongly present and eclipse observed in final part of LC.


2007, Sep 15/16

Light curve of Sep 1
5/16, 2007 in V-filtered light. Clear skies initially, then clouds.  Superhumps strongly present.


2007, Sep 13/14

Light curve of Sep 13/14, 2007 in unfiltered light. Sky conditions initially were good, then it became hazy and finally 
low clouds stopped the run. Period analysis on the Sep 13/14 data, using the ANOVA method, reveals a 
superhump period of 0.057 +/- 0.002 d.


2007, Sep 12/13

Light curve of Sep 12/13, 2007 in unfiltered light. Sky conditions were moderate, with low clouds near the end of the session. 
Lots of small-scale modulations, and no evident signature of common superhumps (yet).


2007, Sep 11/12

Light curve of Sep 11/12, 2007 in V light. Sky conditions were not good : broken clouds and finally overcast.


2007, Sep 07/08

Light curve of Sep 07/08, 2007, obtained under good seeing (but with broken clouds at some occasions). The first part of the light curve -till JD 2454351.38- is unfiltered. All other observations are V filtered. Early superhumps are "clearly" present. 
Period analysis
on the Sep 07/08 data, using the ANOVA method, reveals an (early) superhump period of 0.0561 +/- 0.0011 d, which is well in line with other values published a/o on CVNET. Note also the intensive short-period oscillations, 
superimposed on the superoutburst profile.





Copyright © 2007 - Tonny Vanmunster.