Abstract
view Abstract Citations (54) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Abundances in Two Horizontal-Branch a Stars Kodaira, K. ; Greenstein, Jesse L. ; Oke, J. B. Abstract Two horizontal-branch A stars, HD 86986 and HD 109995, have been analyzed spectroscopically by a combination of coarse- and fine-analysis techniques with spectrophotometric scans. The physical parame- ters, in Tables 1 and 6, include space motions near 350 km sec~, effective temperatures near 78000 K, and low surface gravity, log g = 3.0. The rotational velocities are small. The stars were compared differentially with HD 161817, which was analyzed by Kodaira who used a model atmosphere. The metal deficiencies, with respect to the Sun, for all three stars are given in Table 9. The mean values for thirteen elements were log~o (*)/~(o) = -1.54 (HD 86986), -1.76 (HD 109995), and -1.16 (HD 161817). The different nucleosynthetic processes show a systematic trend, similar to that found in the very metal-poor giant HD 122563. The a-nuclei (Mg, Ca, Si) are least deficient, the s-process (Sr, Y, Zr, Ba) most deficient, and the differences are largest in the most metal-poor star. An analysis of carbon and oxygen, using lines near the limit of detectability, shows them in high abundance, relative to the metals Publication: The Astrophysical Journal Pub Date: February 1969 DOI: 10.1086/149889 Bibcode: 1969ApJ...155..525K full text sources ADS | data products SIMBAD (6)
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