Chemical abundances of RR Lyrae stars in the globular cluster M4
- 1 March 1994
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 267 (1) , 43-50
- https://doi.org/10.1093/mnras/267.1.43
Abstract
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] = |$-1.4\textpm{0.2}$|; 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.Keywords
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