CN Abundance Inhomogeneities in the Globular Cluster Messier 4 (NGC 6121): Results Based on Merged Data Sets from the Literature

Details CN Abundance Inhomogeneities in the Globular Cluster Messier 4 (NGC 6121): Results Based on Merged Data Sets from the Literature CN Abundance Inhomogeneities in the Globular Cluster Messier 4 (NGC 6121): Results Based on Merged Data Sets from the Literature

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasp..117..895s&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 117, Issue 835, pp. 895-910.

Astronomy and Astrophysics

Astronomy

7

Stars: Abundances, Galaxy: Globular Clusters: Individual: Messier Number: M4, Galaxy: Globular Clusters: Individual: Ngc Number: Ngc 6121

Scientific paper

In this paper, we investigate the behavior of the λ3883 CN absorption bands in the spectra of red giants in the globular cluster Messier 4. Data from three literature sources, including the original survey of Norris, have been combined to produce a picture of the CN band strength over an absolute magnitude range of -2.5~0) suggests the possibility of a pre-RGB component to the abundance inhomogeneities. Accretion of material from a central reservoir of stellar ejecta, or mass transfer within binary star systems, are discussed as possible origins for the enrichment of the CN-strong stars. In the case of M4, these processes must have occurred at sufficiently early times that dynamical relaxation of the cluster has largely erased any initial gradient in the relative space densities of CN-strong and CN-weak stars, at least within the volume of the current stellar sample that extends to three half-mass radii from the cluster center.

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