Chemical abundances in the Outer Disk Clusters Tombaugh 2, Melotte 71, and NGC 2112

Details Chemical abundances in the Outer Disk Clusters Tombaugh 2, Melotte 71, and NGC 2112 Chemical abundances in the Outer Disk Clusters Tombaugh 2, Melotte 71, and NGC 2112

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1551b&link_type=abstract

Astronomical Journal v.112, p.1551

Astronomy and Astrophysics

Astronomy

43

Galaxy: Halo, Ism: Individual: Ngc 2112, Ism: Individual: Tombaugh 2, Ism: Individual: Melotte 71, Galaxy: Abundances

Scientific paper

We have analyzed high-dispersion echelle spectra of two or three stars each in the old anticenter disk clusters Tombaugh 2, NGC 2112, and Melotte 71. We find all three clusters to be mildly metal deficient, with [Fe/H]≃-0.45, -0.1, and -0.3, respectively, with an error of ˜0.2 dex. The clusters also have slight overdeficiencies of oxygen and nearly solar proportions of the α elements, indicating a lower relative contribution by massive stars to the chemical evolution of the outer Galactic disk. The clusters are found to be less metal deficient than photometric and low-resolution spectroscopic studies had indicated, which we attribute to severe nonmember contamination in those samples and/or reddening uncertainties. Our analysis suggests reddening values of E(B - V) =0.3-0.4 for Tom 2 and E(B - V) ≍0.6 for NGC 2112. NGC 2112 suffers from severe field star contamination.

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