Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..591f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 591-606.
Astronomy and Astrophysics
Astrophysics
42
Stellar Evolution, Stellar Spectrophotometry, Variable Stars, Abundance, Globular Clusters, Infrared Photometry, Interstellar Extinction, Metallicity, Stellar Oscillations, Stellar Parallax
Scientific paper
The period shift in both field and globular cluster RR Lyrae stars is examined. The stellar pulsation theory called the Sandage Period Shift to determine the mean M(V) of RR Lyrae stars is investigated. The advantages of (V-K) compared to (B-V) as a temperature indicator for RR Lyraes are discussed in detail. Period shift-metallicity relations are derived using recently published infrared photometry of field RR Lyraes and globular cluster RR Lyraes. Other method for determining mean M(V) for RR Lyraes are critically reviewed. It is argued that results for main sequence fitting, statistical parallax, and Red Giant Branch theory are presently too uncertain to be used. The slope of the mass-metallicity relation from pulsation theory is in serious disagreement with that from Horizontal Branch Theory.
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