Chemical Abundances of Rr-Lyrae Stars in the Globular Cluster M4

Details Chemical Abundances of Rr-Lyrae Stars in the Globular Cluster M4 Chemical Abundances of Rr-Lyrae Stars in the Globular Cluster M4

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267...43c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 267, NO. 1/MAR1, P. 43, 1994

Other

8

Stars: Abundances - Stars: Horizontal Branch - Stars: Variables: Other - Globular Clusters: Individual: M4

Scientific paper

High-resolution spectra (R=15 000-25 000) of three RR Lyrae stars in the globular cluster M4 are used to perform a chemical abundance analysis of these horizontal branch stars. We obtain a metal abundance of [Fe/H] = - 1.4±0.2; α-elements (Mg and Ti) are overabundant by 0.6 dex. These results are in good agreement with [Fe/H] estimates from the ΔS index and with abundance determinations from high-resolution spectra of giants and blue horizontal branch stars.

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