Newly Discovered Eclipsing Binary 2MASS J18024395+4003309 (VSX J180243.9+400331):Two-Color Photometry vs Phenomenological Modeling

TL;DR

This study analyzes two-color photometric observations of a newly discovered eclipsing binary, applying phenomenological modeling to estimate physical parameters and address methodological challenges with limited data.

Contribution

It introduces a combined approach using trigonometric polynomial and NAV phenomenological modeling for analyzing eclipsing binaries with sparse color observations.

Findings

Classification as Algol-type variable with O'Connell effect

Estimates of physical parameters from phenomenological analysis

Methodological insights for limited color data scenarios

Abstract

We report on analysis of the two-color VR CCD observations of the newly discovered variable 2MASS J18024395+4003309=VSX J180243.9+400331 obtained using the 1-m telescope of the Mt. Lemmon Observatory (LOAO) in the field of the intermediate polar V1323 Her. The extended version of this conference talk we published in 2015JASS...32..127A. The variability was reported in 2012OAP....25..150A, and the object was monitored. The two-color observations covered all phase interval. The object is classified as an Algol-type variable with tidally distorted components, and shows an asymmetry of the maxima (the O\'Connell effect). For phenomenological modeling, we used the trigonometric polynomial approximation of statistically optimal degree, and a recent method "NAV" (New Algol Variable) using local specific shapes for the eclipse. Methodological aspects are described, especially for the case of few color observations. Estimates of the physical parameters based on analysis of phenomenological parameters, are presented.