| Abstract : | Based on data from the Kepler and JCBT 1.3m telescopes,
we performed a photometric investigation of EV Cnc in the
M67 open cluster. EV Cnc was also observed by the Kepler
K2 mission in Campaign 5. The light curve of EV Cnc is quite
different from those of normal contact or near-contact
systems. Therefore, different possibilities were taken into
consideration to model the light curve. The minima are quite
different, which may be an indication of a semi-detached
configuration rather than a contact one. The O'Connell effect
is an asymmetry in the light curve of EV Cnc at the maxima,
which we see. The light curves of EV Cnc show asymmetry
in their maxima. We obtained the smallest sigma value at q
= 0.5. The value of q was chosen as an adjustable
parameter to perform the final solution. The solution
indicates a hot spot located on the surface of the star an
impact region of flowing material from the secondary star
that faces the cooler component. We also studied the period
change in the binary system in order to constrain the mass
accretion rate and angular momentum transfer. The results
are briefly discussed. |
