The composition of HB stars RR Lyrae variables

a r X i v :a s t r o -p h /9507056v 1 14 J u l 1995THE COMPOSITION OF HB STARS:RR LYRAE V ARIABLES 1G.CLEMENTINI 2Osservatorio Astronomico di Bologna,CP 596,I-40126Bologna E.CARRETTA Dipartimento di Astronomia,Universit´a di Padova,Vicolo dell’Osservatorio 5,I-35122Padova and Osservatorio Astronomico di Bologna,CP 596,I-40126Bologna R.GRATTON Osservatorio Astronomico di Padova,Vicolo dell’Osservatorio 5,I-35122Padova R.MERIGHI Osservatorio Astronomico di Bologna,CP 596,I-40126Bologna J.R.MOULD M.Stromlo and Siding Spring Observatories,Institute of Advanced Studies,Australian National University,Weston PO,ACT 2611,Australia J.K.McCARTHY Palomar Observatory,California Institute of Technology,Pasadena,CA 91125

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