A note on the reality of cosmic calcium and iron decoupling

Details A note on the reality of cosmic calcium and iron decoupling A note on the reality of cosmic calcium and iron decoupling

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84...86b&link_type=abstract

Astronomical Journal, vol. 84, Jan. 1979, p. 86-89.

Astronomy and Astrophysics

Astronomy

41

Astronomical Photometry, Decoupling, Galactic Evolution, Iron, K Lines, Spectrophotometry, Abundance, Calcium, Cepheid Variables, Chemical Evolution, Globular Clusters, Hydrogen

Scientific paper

The K-line (Ca II) metal-abundance parameter for RR Lyrae stars is shown to be much more tightly correlated with Fe/H than one might expect judging from the Fe/H, Ca/Fe correlation for non-RR Lyrae stars. Under the assumption that the cosmic component of scatter can be characterized satisfactorily by a normal distribution, it is concluded that errors of observation and analysis are probably responsible for the large scatter in the Fe/H, Ca/Fe diagram for non-RR Lyrae stars; there is little room for the kind of cosmic scatter reported by Cohen (1978) for VZ 1397, a giant in the globular cluster M3.

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