The reason for the occurrence of W-type contact binaries

TL;DR

This study analyzes over 3,000 contact binaries and finds a strong correlation between magnetic activity and the W-type phenomenon, suggesting magnetic activity as the key factor behind the temperature inversion in these systems.

Contribution

It provides the first large-scale statistical evidence linking magnetic activity to the W-type contact binary phenomenon.

Findings

Strong positive correlation between magnetic activity and W-type occurrence

Magnetic activity likely drives the temperature inversion in W-type binaries

Explains transitions between W-type and A-type contact binaries

Abstract

For more than half a century, the puzzling W-type phenomenon in contact binaries has challenged astrophysicists. In these systems, the less massive component exhibits a higher surface temperature than its more massive companion, which is a reversal of the typical A-type configuration, where the more massive star is hotter. This counterintuitive temperature inversion defies the basic stellar physics and still lacks a widely accepted explanation. In this study, we assembled a sample of over 3,000 extensively observed contact binaries and derived their complete set of physical parameters. Our statistical analysis revealed a strong positive correlation between the occurrence of W-type contact binaries and the intensity and frequency of magnetic activities. This result strongly supports the hypothesis that magnetic activities are the primary driver of the W-type phenomenon and offers a compelling explanation for the observed transitions between the W-type and A-type.