The calcium abundance in NGC 1851

Details The calcium abundance in NGC 1851 The calcium abundance in NGC 1851

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..961r&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Sept. 1987, p. 961-966.

Statistics

Computation

6

Abundance, Calcium, Globular Clusters, Hertzsprung-Russell Diagram, K Lines, Lyra Constellation, Computational Astrophysics, Galactic Nuclei, Morphology, Stellar Luminosity

Scientific paper

Spectra have been obtained of eight horizontal branch stars including three RR Lyrae stars, in the globular cluster NGC 1851. The spectra were measured to obtain equivalent widths of Ca II K and profiles of the Hδ line. The equivalent width of the interstellar component of the K line is found to be 0.56 Å. Stetson's (1981) photometry of the cluster is used for an independent measurement of the interstellar reddening and his value of E(B-V) = 0.02±0.01 is confirmed. Measurement of the calcium and hydrogen lines leads to a value of [Ca/H] = -1.0±0.15.

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