On The Masses And Luminosities Of RR Lyrae Stars

Authors

Norman R. Simon, University of Nebraska - LincolnFollow

Date of this Version

8-1-1989

Document Type

Article

Citation

THE ASTROPHYSICAL JOURNAL, 343: L17-L20, 1989 August 1

Comments

Copyright 1989 The American Astronomical Society. All rights reserved. Printed in U.S.A.

Abstract

Some results are given from the comparison with observations of a large number of hydrodynamic pulsation models: (1) Linear pulsation calculations are adequate for the determination of the masses of RRd stars; (2) the Fourier phase parameter ϕ₃₁ measures the luminosity-to-mass ratio L/M^1.81 for RRc stars; (3) most of the Ѡ Cen RRc stars seem to be evolved, as has previously been suggested; (4) the masses of the w Cen RRc stars agree with the masses of RRd stars in other clusters; and (5) a hint emerges of a mass-helium abundance relation among the RRc stars in Ѡ Cen. New CCD observations will be needed to extend our analysis to additional globular clusters.