1. Home
  2. Forums
  3. Variable Star Observing
  4. Photometry

What am I doing wrong - need some help

swadhwa
Affiliation
Variable Stars South (VSS)
Thu, 11/14/2019 - 12:13

I have acquired images/photometry over two nights of a contact binary star.

 

I clearly have two maxima and two minima and visually I have complete phase coverage.

 

I have calculated a new period - close to published so likely to be correct.

 

Time of minima - I calculated the time of minima based on the deeper minimum however when I fold based on this I only get one minima and one maxima and clearly some overlapping of data points (fig 1).

If however I fold based on the other minima (slightly brighter) the I get two maxima and two minima but part of the curve is missing (fig 2).

 

Any suggestions welcome

 

Regards

S

File Upload
fold problem1.jpg58.43 KB
fold problem2.jpg65.21 KB
hambsch
Affiliation
Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) (VVS)
Thu, 11/14/2019 - 12:32
Period of eclipsing binary is double the one of fig 1

Hi,

eclipsing binaries have two minima/maxima and hence the period of your fase diagram in Fig. 1 is not vcorrect and should be doubled.

Josch