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Unusual ELL or something else?

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Unusual ELL or something else?

Hello everyone,

This is the time when I need your help (again). Here's a newly found variable with spectral type A0, see the attached phase plot. It shows changes of brightness in P=3.28 d. J-K= -0.02; B-V= 0.09. I have already seen something like that before and the change was a quite large. I kept that one as ELL with O'Connell effect. But this one is even more asymetric than that one. In your opinion, is it also an ELL variable or something different? I don't have any other ideas about that, something unusual (for me) like that made me think about other types. I have been trying to search for similar light curves in Google and I found one ( Unfortunately they don't mention what exactly is it.


Gabriel Murawski

EDIT: Yes, if it was ELL, phase 1.0 should be at minimum, not maximum.

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Unusual ELL or something else?

One of the solutions could be very unusual eclipsing binary.
Using ASAS data you can see the preliminary parameters of such a binary system.
The photometric data were fitted by Phoebe code (Prsa & Zwitter 2005, Prsa et al. 2011, Prsa
et al. 2016)
Eclipsing binary - overcontact
Epoch: 2457351.729063
Period: 3.280093
Тeff: 9330 K
Spectral type: A1
Inclination: 30 deg (partial eclipses - small delta)
Cool spot to fit distorsion of the LC (O'Connel effect)

Thanks! I never heard about

Thanks! I never heard about that program, I will have to take a closer look. Looks like a really good one to analyze unusual binary systems.

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