Cepheid Radii and the Cors Method Revisited

TL;DR

This paper refines the CORS method for calculating Cepheid radii, enabling its application to extensive observational data, and discusses the resulting period-radius relation for about 70 Cepheids.

Contribution

The authors improve the CORS method by deriving one of its terms directly from observational data, broadening its applicability to recent large datasets.

Findings

New radii for approximately 70 Cepheids

Discussion of the updated period-radius relation

Enhanced method applicable to extensive observational data

Abstract

We have refined the CORS method, introduced in 1980 for the computation of the cepheid radii, in order to extend its applicability to recent and extensive sets of observations. The refinement is based on the computation, from observational data only, of one of the terms of the solving equation, previously based only on precise calibrations of photometric colours. A limited number of assumptions, generally accepted in the literature, is used.\par New radii are computed for about 70 cepheids, and the resulting P-R relation is discussed.