A Large Sample Sodium and Magnesium Abundance Study in the Globular Cluster M3 (NGC 5272)

Details A Large Sample Sodium and Magnesium Abundance Study in the Globular Cluster M3 (NGC 5272) A Large Sample Sodium and Magnesium Abundance Study in the Globular Cluster M3 (NGC 5272)

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..336..331j&link_type=abstract

Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert, ASP Conference Series, Vol.

Astronomy and Astrophysics

Astronomy

Scientific paper

We have derived sodium and magnesium abundances for more than 100 red giant branch (RGB) stars in the Galactic globular cluster M3 (NGC 5272), using moderate resolving power (R˜20,000) spectra obtained with the WIYN telescope and Hydra multi-fiber spectrograph. Temperatures for the M3 sample are based on calibrations of photometric indices, in particular V-K. Gravities, microturbulent velocities, and the overall M3 metallicity ([Fe/H]˜--1.5) are based on earlier high-resolution spectroscopic analyses. Na and Mg abundances have been determined from observed/synthetic spectrum matches of the 5682, 5688 Å Na I lines and the 5711 Å Mg I line. The resulting M3 abundances are compared with the more detailed analyses of a smaller sample of M3 RGB stars observed at very high spectral resolution with the Keck I HIRES instrument, and with a similarly large-sample data set previously obtained for M13. We conclude that the star-to-star variation in sodium is greater than that of magnesium in both clusters and also that M13 contains a higher population of low sodium, high magnesium stars than does M3.

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