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Dwarf Cepheid Radii and the Distance Scale

Published online by Cambridge University Press:  12 April 2016

C.D. Laney ,
M. Joner  and
L. Schwendiman
C.D. Laney
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
M. Joner
Affiliation:
Brigham Young University, Provo, Utah, U.S.A.
L. Schwendiman
Affiliation:
Brigham Young University, Provo, Utah, U.S.A.

Abstract

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Baade-Wesselink radii for dwarf Cepheids (High Amplitude Delta Scuti stars) can give luminosities and distances independent of the classical Cepheid distance scale. Using optical and IR photometry together with precision radial velocities, the authors have obtained radii and luminosities for 7 stars, and combined these with two from the literature, obtaining results consistent with the luminosities of the 3 dwarf Cepheids with good Hipparcos parallaxes. Classical Cepheids and dwarf Cepheids appear to fit the same PL and PR relations. The results imply ‘bright’ RR Lyrae absolute magnitudes giving an LMC distance modulus of 18.51-18.54, in agreement with the distance derived from classical Cepheids.

Type
Part 1.3. Stellar Pulsation and the Distance Scale
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 112 - 115
Copyright
Copyright © Astronomical Society of the Pacific 2002

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