Abundances of the Light Elements in the Hydrogen-Poor Star HD 30353

Abstract

view Abstract Citations (33) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Abundances of the Light Elements in the Hydrogen-Poor Star HD 30353 Wallerstein, George ; Greene, Thomas F. ; Tomley, Leslie J. Abstract A coarse analysis of the hydrogen-poor star HD 30353 has been performed in order to provide first- order abundances of the light elements. High-dispersion spectrograms (8-15 A/mm) and absolute gJvalues have been used to derive atmospheric parameters. Stratification effects are evident in the excitation temperature which was found to vary from 0 = 0 85 for Fe I to 0 = 0.45 for Si II. With o = 0.50, the electron pressure was found to be 2 dynes/cm2 to explain the ionization of nitrogen, silicon, and sulfur. The ratio of H/He of 10- was found from the comparison of the observed profile of H and profiles computed from model atmospheres. Nitrogen is the second most abundant element and the ratios of Nc/NN = 10- and No/NN = 2 X 10-2 were found from curves of growth. The abundances of neon, silicon, and sulfur were found to be normal. The low hydrogen abundance and the rearrangement of the CNO nuclei are discussed in terms of mass loss and carbon cycling. Publication: The Astrophysical Journal Pub Date: October 1967 DOI: 10.1086/149326 Bibcode: 1967ApJ...150..245W full text sources ADS | data products SIMBAD (1)