[Aavso-photometry] V358 Lyr analysis

[Jeremy Shears]

I have analysed photometry conducted by several members of CBA, AAVSO and BAA obtained during the outburst. This includes data from Tom Krajci, Bob Koff, Tut Campbell & George Roberts, David Boyd and Shawn Dvorak, either sent directly to me or downloaded from the AAVSO International Database. Many thanks to these observers who persevered with a challengingly faint target in a poor sky location! 
 
The first conclusion is that, by visual inspection of the light curve, there is no obvious modulation such as superhumps - that we pretty much knew already and there have been several discussions on the user groups as to why this might be.
 
Period analysis using a variety of algorithms in Peranso gives the largest signal at 0.057 d (82 min). However, there are many other peaks in the power spectrum and this signal is not particularly strong. The False Alarm Probability given by Peranso is 1%, which is on the borderline between a secure period and a spurious one. On this basis I cannot claim this to be a significant period.
 
One way to rule this period in or out would be to include more data in the analysis, especially if this were obtained at other longitudes - one problem we have is that the runs were necessarily rather short due to the location of the star. Therefore if you do have further data on this star, I would be delighted if you could send it to me.
 
Jeremy Shears,
Cheshire UK
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