A multiphase study of classical Cepheids in the Magellanic Clouds- Models and Observations

TL;DR

This study compares models and observations of classical Cepheids in the Magellanic Clouds, revealing dynamic multiphase relations that differ between short and long periods, and highlighting the importance of multiphase analysis for testing stellar pulsation theories.

Contribution

It provides a detailed multiphase analysis of Cepheids in the Magellanic Clouds, comparing models and observations to improve understanding of stellar pulsation.

Findings

Models agree better with observations in the PC plane than in the PL plane.

Multiphase relations show contrasting behavior for short and long periods.

Different convection models can be distinguished through multiphase relations.

Abstract

This work presents the study of multiphase relations of classical Cepheids in the Magellanic Clouds for short periods (log P < 1) and long periods (log P > 1). From the analysis, it has been found that the multiphase relations obtained using the models as well as observations are highly dynamic with pulsational phase. The multiphase relations for short and long periods are found to display contrasting behaviour for both LMC and SMC. It has been observed that the multiphase relations obtained using the models agree better with the observations in the PC plane in most phases in comparison to the PL plane. Multiphase relations obtained using the models display a clear distinction among different convection sets in most phases. Comparison of models and observations in the multiphase plane is one way to test the models with the observations and to constrain the theory of stellar pulsation.