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Carbon, nitrogen, and oxygen abundances in main-sequence stars. I - Procyon and the Hyades cluster stars 45 Tauri and HD 27561

1978; IOP Publishing; Volume: 223; Linguagem: Inglês

10.1086/156325

1538-4357

J. Tomkin, David L. Lambert,

Astro and Planetary Science

view Abstract Citations (57) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Carbon, nitrogen, and oxygen abundances in main-sequence stars. I. Procyon and the Hyades cluster stars 45 Tauri and HD 27561. Tomkin, J. ; Lambert, D. L. Abstract High signal-to-noise observations of C I, N I, and 0 1 lines in the near-infrared spectra of Procyon and the Hyades cluster main-sequence stars 45 Tau and HD 27561 have been analyzed to determine their carbon, nitrogen, and oxygen abundances. The carbon, nitrogen, and oxygen abundances of all three stars are solar. The estimated uncertainty of the abundances is +0.2 dex. Analysis of observations of the forbidden carbon and oxygen lines, CH blue system (0, 0) and (1, 1) band lines, and CN violet system (0, 0) band lines in Procyon provides a check of the results obtained from the permitted atomic lines. The solar C/N ratio of the Hyades cluster dwarfs allows the less-than-solar C/N ratio of the Hyades giants recently determined by Lambert and Ries to be unambiguously interpreted as the effect of CNO cycle processing during the giants' main-sequence lifetime. The iron abundances of Procyon, 45 Tau, and HD 27561 derived from the equivalent widths of Fe I and Fe ii lines are found to be solar. This result is consistent with previous spectroscopic determinations of the iron abundance of Hyades cluster stars. The discrepancy between the spectroscopic determinations of a solar metal content of the Hyades and the metal richness inferred from photometry is discussed. Subject headings: clusters: open - stars: abundances - stars: individual Publication: The Astrophysical Journal Pub Date: August 1978 DOI: 10.1086/156325 Bibcode: 1978ApJ...223..937T Keywords: Abundance; Main Sequence Stars; Near Infrared Radiation; Star Clusters; Stellar Spectra; Carbon; Forbidden Bands; Line Spectra; Nitrogen; Oxygen; Spectrum Analysis; Astrophysics; Element Abundances:Main-Sequence Stars; Hyades:Metal Content; Infrared Spectra:Main-Sequence Stars full text sources ADS | data products SIMBAD (5) Related Materials (1) Part 2: 1981ApJ...250..262C