Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189...70c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 70-73.
Astronomy and Astrophysics
Astrophysics
36
Globular Clusters, Metallicity, Milky Way Galaxy, Periodic Variations, Variable Stars, Interstellar Extinction, Light Curve
Scientific paper
Data for ab-type RR Lyrae variables in the globular cluster ω Cen are discussed with a view to the period shift versus metallicity relation found by Sandage for galactic globular clusters. The results seem to suggest that the blue amplitude A(B) and the rise time φ of the curve are not a unique function of the effective temperature of the variable, but depend also on the metal content [Fe/H] of the variable. If such a dependence is properly taken into account when analyzing the RR Lyrae variables in the other clusters, the resulting period shift versus metallicity relation could have a slope close to the theoretically predicted one (ΔlogP/Δ[Fe/H] < 0.03). A firm answer to this problem requires a careful reinvestigation of the globular cluster reddening.
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