Abundances of red giants in NGC 6441 (Gratton+, 2007)

Details Abundances of red giants in NGC 6441 (Gratton+, 2007) Abundances of red giants in NGC 6441 (Gratton+, 2007)

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ycat..34640953g&link_type=abstract

VizieR On-line Data Catalog: J/A+A/464/953. Originally published in: 2007A&A...464..953G

Physics

Clusters: Globular, Stars: Population Ii, Equivalent Widths, Radial Velocities

Scientific paper

We present an analysis of FLAMES-Giraffe spectra for several bright giants in NGC 6441, to investigate the presence and extent of the Na-O anticorrelation in this anomalous globular cluster.
The field of NGC 6441 is very crowded, with severe contamination by foreground (mainly bulge) field stars. Appropriate membership criteria were devised to identify a group of 25 likely cluster members among the about 130 stars observed. Combined with the UVES data obtained with the same observations (Gratton et al., 2006, Cat. ), high dispersion abundance analyses are now available for a total of 30 stars in NGC 6441, 29 of them having data for both O and Na. The spectra were analyzed by a standard line analysis procedure; care was taken to minimize the impact of the differential interstellar reddening throughout the cluster, and to extract reliable information from crowded, and moderately high S/N (30-70), moderately high resolution (R~23000) spectra.
(2 data files).

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