Photometric Study of the Unusual Binary System VSX J052807.9+725606

TL;DR

This study presents a detailed three-color photometric analysis of the unusual binary system VSX J052807.9+725606, revealing asymmetries, wavelength-dependent amplitudes, and hot spot characteristics, supporting a direct impact accretion model.

Contribution

It provides the first detailed photometric characterization of VSX J052807.9+725606, confirming its similarity to V361 Lyr and introducing a hot spot model for its behavior.

Findings

Confirmed strong asymmetry of the phase curve.

Discovered wavelength dependence of amplitude.

Estimated characteristics of the hot spot.

Abstract

The results of three-color BVR photometric study of a recently discovered unusual binary system VSX J052807.9+725606 = USNO-B1.0 1629-0064825 are presented. This system is very similar to V361 Lyr, which was assumed to be unique. We confirmed a strong asymmetry of the phase curve and found the wavelength dependence of the amplitude. This is interpreted by a "direct impact" model with a "hot spot" in the atmosphere of the accreting component. Color temperatures are determined. Characteristics of the "hot spot" are estimated. We also calculated the new ephemeris for VSX J052807.9+725606.