Washington photometry of open cluster giants - Seven metal-poor anticenter clusters

Details Washington photometry of open cluster giants - Seven metal-poor anticenter clusters Washington photometry of open cluster giants - Seven metal-poor anticenter clusters

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94...84g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, July 1987, p. 84-91.

Astronomy and Astrophysics

Astronomy

56

Abundance, Giant Stars, Open Clusters, Star Distribution, Stellar Spectrophotometry, Metallicity, Milky Way Galaxy, Stellar Evolution, Stellar Luminosity, Stellar Temperature

Scientific paper

Photometry on the revised Washington system is presented for 75 stars in seven open clusters in the Galactic anticenter. The temperature, a luminosity criterion, and two independent abundance indices are derived for each star. The spread in the individual C-M abundances in NGC 2158 and 2204 suggests that CN-strength variations exist among the giants in these clusters, corroborating earlier work. The mean cluster abundances are [A/H] = -1.3±0.3 for NGC 2112, -0.63±0.15 for NGC 2141, -0.88±0.10 for NGC 2158, -0.47±0.10 for NGC 2204, -0.93±0.15 for NGC 2243, -1.2±0.5 for Tombaugh 2, and -0.46±0.10 for NGC 2506. Four of these open clusters are found to have metallicities as low as, or lower than, 47 Tuc. Both NGC 2112 and Tombaugh 2 are exceptional clusters with regards to their age, galactic location, and extreme metal-poorness. A comparison of their respective age-metallicity relations shows that the chemical-enrichment history of the Galactic anticenter clusters was much more like that experienced in the Large Magellanic Cloud than that which occurred in the solar neighborhood disk.

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