Abstract
view Abstract Citations (62) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Carbon Abundances in Halo Dwarfs Tomkin, J. ; Sneden, C. ; Lambert, D. L. Abstract A spectrum synthesis analysis has been made of Digicon observations of CH in 32 halo F and G dwarfs with iron abundances as low as (Fe/H) approximately equal to -2.5. The results, combined with earlier results, also based on spectrum synthesis of Digicon CH spectra, show that carbon follows iron down to (Fe/H) about -1.8; at lower metallicities there is evidence of a positive trend in (C/Fe). It is suggested that the change in slope of the (C/Fe) vs (Fe/H) relationship at (Fe/H) about -1.8 is due to the appearance of Type I supernovae. The sense of the change of slope is consistent with the prediction that Type I supernovae are inefficient producers of carbon. More carbon abundances, determined from analysis of CH in even more metal-deficient stars and, also, determined from C I lines, are needed in order to establish the relationship between carbon and iron abundances in extremely metal-deficient (Fe/H less than about -2.0) dwarfs more firmly. One of the program stars (BD -0 degrees 4470) is found to be a double-lined spectroscopic binary composed of two nearly identical halo dwarfs. Publication: The Astrophysical Journal Pub Date: March 1986 DOI: 10.1086/164000 Bibcode: 1986ApJ...302..415T Keywords: Carbon Stars; Dwarf Stars; Metallicity; Stellar Composition; Stellar Spectra; Binary Stars; F Stars; G Stars; Milky Way Galaxy; Supernovae; Astrophysics; STARS: ABUNDANCES; STARS: POPULATION II full text sources ADS | data products SIMBAD (31)
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