V369 Gem: A New Ellipsoidal Variable System With High Level Chromospheric Activity

TL;DR

This paper reports the discovery that V369 Gem is an ellipsoidal variable star exhibiting high chromospheric activity, based on combined photometric data and light curve analysis.

Contribution

It is the first study to identify V369 Gem as an ellipsoidal variable with significant chromospheric activity using Fourier analysis of combined photometric data.

Findings

V369 Gem is an ellipsoidal variable star.

The star exhibits high chromospheric activity.

Two spotted areas are present, separated by about 180 degrees.

Abstract

In this study, we present BVR photometry of V369 Gem in 2006 - 2008. We combined our V data with the data taken from the literature. We analysed all the data together and calculated the new light elements. General features of the light curves were discussed. The light curves were modelled with the Fourier method and the Fourier coefficients calculated. The cos(2theta) term was found to be dominant. The pre-whitened V light curves demonstrated that stellar spot activity also exist. There are generally two minima in the pre-whitened light curves. Thus, there must be two spotted areas, which are separated about 180 deg from each other. As conclusions, we have remarked for the first time that V369 Gem is an ellipsoidal variable with the high level chromospheric activity.