Calcium abundances in giant stars of the globular clusters M3, M13, M15, and M92

Journal Article · Tue Apr 01 04:00:00 EST 1980 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/112689· OSTI ID:5364440

Suntzeff, N B

The average calcium II H and K line strengths of giant stars in M3, M13, M15, and M92 are found to be closely correlated with the (Fe/H) of the cluster. Simple physical arguments are provided to show the observed average line strengths reproduce the difference in (Fe/H) between the clusters. The observed dispersion in H and K line strengths yields an upper limit of 0.15 dex for M15 and M92, and 0.11 dex for M3+M13 for the average intracluster variation of (Ca/H), provided (Ca/H)=Fe/H). The dispersions drop to half these values if the calcium abundance varies independently of the iron peak abundances.

• Research Organization: Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, California 95064
• OSTI ID: 5364440
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 85:4; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ATOMIC IONS
BALMER LINES
CALCIUM IONS
CHARGED PARTICLES
CHEMICAL COMPOSITION
CHEMISTRY
COSMOCHEMISTRY
ELEMENTS
GIANT STARS
IONS
IRON
METALS
STAR CLUSTERS
STARS
TRANSITION ELEMENTS