The secondary of U Sagittae

Details The secondary of U Sagittae The secondary of U Sagittae

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..785n&link_type=abstract

Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 785-789. Research supported by the California State Unemployment Insu

Astronomy and Astrophysics

Astrophysics

12

Abundance, Eclipsing Binary Stars, Metals, Spectrum Analysis, A Stars, Line Shape, Stellar Structure

Scientific paper

Two moderately high-dispersion spectra (15 and 16 A/mm) of the secondary component of U Sagittae were analyzed using a crude curve-of-growth technique and a more sophisticated synthetic spectrum analysis. The results show a mild metal deficiency, the Fe/H abundance ratio being 6.90. However, the abundances of certain s-process elements (Sm, La, Sr, Ce, Zr) are slightly enhanced. The abundances with respect to iron resemble those of metallic-line A stars. No unexplained mechanisms are needed to account for the observed line profiles. It is argued that currently held theories of stellar structure and/or mass exchange in Algol-type binaries cannot satisfactorily account for these results.

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