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- W2034255133 abstract "view Abstract Citations (157) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Resolution CCD Spectra of Stars in Globular Clusters. VII. Abundances of 16 Elements in 47 Tuc, M4, and M22 Brown, Jeffery A. ; Wallerstein, George Abstract We have derived elemental abundances from high-resolution CCD echelle spectra of a selection of giant stars in the globular clusters 47 Tuc, M4, and M22. Elements determined include the alpha elements Mg, Si, Ca, and Ti, the light odd-Z elements Na and Al, the iron-peak elements Sc, Fe, and Zn; the s-process elements Y, Zr, Ba, and La, and the r-process element Eu. The alpha elements are slightly overabundant with respect to Fe, indistinguishable from the trend in the field halo stars. However, the globular cluster stars in our sample show strong excesses of Na and Al which are correlated with the C and N abundances: We confirm that the CN-Na, Al correlations in globular clusters are due to abundance anomalies. We argue that these anomalies must be 'primordial' in origin, and discuss implications of these anomalies for the precursor population and the formation of the clusters. Publication: The Astronomical Journal Pub Date: November 1992 DOI: 10.1086/116360 Bibcode: 1992AJ....104.1818B Keywords: Abundance; Charge Coupled Devices; Globular Clusters; Stellar Spectra; Giant Stars; High Resolution; Astrophysics; GLOBULAR CLUSTERS: INDIVIDUAL: 47TUC; GLOBULAR CLUSTERS: INDIVIDUAL: M4; GLOBULAR CLUSTERS: INDIVIDUAL: M22; STARS: GIANT; STARS: ABUNDANCES full text sources ADS | data products SIMBAD (17) Related Materials (9) Part 1: 1986AJ.....91.1117L Part 2: 1986STIN...8710789L Part 3: 1987AJ.....93..338L Part 4: 1987AJ.....93.1137W Part 5: 1989AJ.....98.1643B Part 6: 1990AJ....100.1561B Part 7: 1991AJ....101.1693B Part 9: 1993AJ....106..133B Part 10: 1997AJ....114..180B" @default.
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- W2034255133 date "1992-11-01" @default.
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- W2034255133 title "High-resolution CCD spectra of stars in globular clusters. VII - Abundances of 16 elements in 47 Tuc, M4, and M22" @default.
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