[vsnet-chat 8165] CR Lac: EA with O'Connell effect

[Ivan Andronov]

CR Lac: EA with O'Connell effect


T_0=2457724.501+- 0.002
P= 3.9498975+-0.0000047
Min I= 13.819(9)
Min II= 13.355 (7)
Max I (phase 0.740) = 13.207(3)
Max II (phase 0.255) = 13.255(3)

The depths of Min I = 0.510(11)
Min II=  0.061(8)
(compared to a smooth curve due ellipticity, reflection and O'Connell effects)


eclipse half-width 0.0762+-0/0018,
ratio of brightnesses of the eclipsed parts 6.9+-0.9),
semi-amplitude of the effect of ellipticity 0.039+-0/003 , O'Connell effect etc.
(see http://adsabs.harvard.edu/abs/2012Ap.....55..536A , http://adsabs.harvard.edu/abs/2016PhysJ...2..140A for a description).
The ASAS-SN data were used (n=578).
The semi-amplitude of the O'Connel effect is 0.0155(20) mag.
Not as large as in V361 Lyr http://adsabs.harvard.edu/abs/1987AN....308..235A ,
but may also be due to the accretion hot spot, rather than a magnetic-driven dark spot.
Hopefully, multi-color observations will justify (or not)

The light curve and the phenomenological NAV approximation are available at http://uavso.org.ua/stars/CR_Lac-NAV.jpg

Thanks to Yenal Öğmen and Howard Bond for putting my attention to this star.

Ivan L. Andronov,
Department "Mathematics, Physics and Astronomy"
Odessa National Maritime University
Odessa, Ukraine

P.S. These results were presented at Facebook on 1.9.2018
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