Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..95d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. L95-L98. Research supported by SERC
Astronomy and Astrophysics
Astrophysics
59
Abundance, Globular Clusters, Oxygen, Red Giant Stars, Sodium, Stellar Composition, Aluminum, Calcium, Iron, Metallicity
Scientific paper
Accurate, quantitative abundances are presented for Fe, Ca, Na, Al, and O in four red giants in the bimodal-CN globular cluster M4. Two of the giants are CN-strong and two are CN-weak: all have very similar magnitudes and colors and, thus, have similar effective temperatures and surface gravities. This analysis utilizes high-resolution, high-SN spectra and up-to-date model atmospheres. For the low-ionization element Na, detailed non-LTE calculations demonstrate that, for lines used in the abundance analysis, departures from LTE are small (less than or approximately equal to 0.1 dex). As a group, these four M4 giants have homogeneous Fe and Ca abundances, while Na, Al, and O vary: the CN-strong stars have larger Na and Al but smaller O abundances than the CN-weak stars. When compared to field metal-poor stars, the CN-weak stars resemble the field stars, while the CN-strong stars are Na and Al rich.
Drake Jeremy J.
Smith Verne V.
Suntzeff Nicholas B.
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