Constructing a Cepheid Period p-Factor Relation from Static Model   Stellar Atmospheres
  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. 
Hilding R. Neilson, Chow-Choong Ngeow, John B. Lester
astro-ph.SR