Observations and light curve solutions of the eclipsing stars CSS J075205.6+381909 and NSVS 691550

TL;DR

This study presents observational data and light curve analysis of two eclipsing stars, determining their initial epochs, periods, and system configurations, revealing their contact or near-contact nature and temperature relations.

Contribution

The paper provides new light curve solutions and system parameters for CSS J075205.6+381909 and NSVS 691550, including their contact status and temperature differences, expanding understanding of these specific eclipsing binaries.

Findings

NSVS 691550 is an overcontact system with similar component temperatures.

CSS J075205.6+381909 has an almost contact configuration with a 2000 K temperature difference.

Both stars exhibit partial eclipses and follow MS star mass-temperature relations.

Abstract

The paper presents observations and light curve solutions of the eclipsing stars CSS J075205.6+381909 and NSVS 691550. As a result their initial epochs were determined. The target periods turned out almost equal to the previous values. We found that NSVS 691550 is overcontact system whose components are close in temperature while CSS J075205.6+381909 has almost contact configuration and temperature difference of its components is around 2000 K. Both targets undergo partial eclipses. Their stellar components seem to obey the relations mass-temperature of MS stars.