Oxygen abundances in halo giants. II - Giants in the globular clusters M13 and M3 and the intermediately metal-poor halo field

Details Oxygen abundances in halo giants. II - Giants in the globular clusters M13 and M3 and the intermediately metal-poor halo field Oxygen abundances in halo giants. II - Giants in the globular clusters M13 and M3 and the intermediately metal-poor halo field

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..645k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 645-668.

Astronomy and Astrophysics

Astronomy

219

Abundance, Giant Stars, Globular Clusters, Metallicity, Oxygen, Iron, Sodium, Spectral Line Width, Stellar Evolution, Stellar Spectra

Scientific paper

Oxygen, sodium, iron, vanadium, and scandium abundances are derived for giants in the intermediately metal-poor globular clusters M3 and M13 and for giants of comparable metallicity in the local halo field. For M13, (Fe/H) of -1.51 +/-0.01 is derived from 13 giants with a range of 500 K in effective temperature. For M3, Fe/H of -1.47 +/-0.01 is found from seven stars with a range of 300 K in effective temperature. M13 stars divide into three apparently discrete oxygen abundance groups: four with 'high' oxygen, seven with 'low' oxygen, and two with 'super-low' oxygen. Fifty-nine giants with (Fe/H) in the range of -3 to -1.3 are found. The O-rich/O-poor dichotomy persists in M92, and most of the field halo giants (25 out of 27) belong to the O-rich group. (O/Fe) is essentially the same in O-rich giants of M3, M13, and the halo field, and a plot of (O/Fe) vs (Fe/H) is essentially flat for O-rich stars.

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