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- W2020076910 abstract "view Abstract Citations (33) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS What is the second parameter?: the anomalous globular cluster NGC 7006. Cohen, J. G. ; Frogel, J. A. Abstract An infrared color-magnitude diagram for NGC 7006 and moderate dispersion digital optical spectra of eight of its members indicate a metal abundance of -1.5 dex with respect to the sun. However, the ratio of red to blue horizontal-branch stars is quite large and is what would be expected for a cluster of much higher metallicity. Molecular band strengths are determined for CO in four stars, and CH and CN in five stars, and it is found that none of these molecular bands are anomalously strong compared to the same molecular features in other globulars of similar metallicity but varying horizontal-branch type. This is contrary to the behavior predicted if the C, N, and O abundances are the 'second parameter' needed to explain anomalous horizontal-branch morphologies. Publication: The Astrophysical Journal Pub Date: April 1982 DOI: 10.1086/183765 Bibcode: 1982ApJ...255L..39C Keywords: Abundance; Globular Clusters; Horizontal Branch Stars; Milky Way Galaxy; Molecular Absorption; Stellar Spectra; Absorption Spectra; Carbon Monoxide; Color-Magnitude Diagram; Cyanogen; Metals; Stellar Magnitude; Stellar Structure; Variable Stars; Astrophysics full text sources ADS | data products SIMBAD (7)" @default.
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- W2020076910 date "1982-04-01" @default.
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- W2020076910 title "What is the second parameter - The anomalous globular cluster NGC 7006" @default.
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