Radii and Luminosities of Population-II Cepheids - Part One - the Period Radius Relation

Astronomy and Astrophysics – Astronomy

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Scientific paper

The modified Wesselink method has been applied to the radii
determination of Population II Cepheids and some RV Tau stars. The
common period-radius relation has been obtained: lg(R/R_sun;) =
0.873+0.523 lg P. A comparison between radii of Population I and
Population II Cepheids in the field and in the clusters has been made.

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