Constructing a Cepheid Period p-Factor Relation from Static Model Stellar Atmospheres

TL;DR

This paper develops a new period p-factor relation for Cepheids by computing static stellar atmosphere models, aiming to resolve discrepancies in p-factor measurements used for distance estimation.

Contribution

It introduces a novel approach using static model atmospheres to derive the Cepheid period p-factor relation, addressing existing measurement disagreements.

Findings

Derived a new period p-factor relation for Cepheids

Provides insights into the p-factor discrepancy issues

Offers a theoretical basis for improved distance measurements

Abstract

One of the largest uncertainties for using the Baade-Wesselink method to measure Cepheid distances is the value of the projection factor (p-factor). However, p-factors measured using the IRSB technique and from hydrodynamic models disagree. In this work, we compute spherically-symmetric static model stellar atmospheres and predict a period p-factor relation.