Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99...38b&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Jan. 1987, p. 38, 39.
Astronomy and Astrophysics
Astronomy
7
Abundance, Binary Stars, Chromosphere, Lithium, Stellar Activity, Absorption Spectra, Charge Coupled Devices, H Alpha Line, Spectrum Analysis, Stellar Spectrophotometry
Scientific paper
The ξ UMa system consists of a visual binary, each component of which is a spectroscopic binary. The visual components have usually been assigned identical spectral types of G0 V. Surprisingly, the lithium λ6708 line has been found in absorption only in ξ UMa A. This small puzzle has been solved by means of new CCD scans, obtained during an interval of excellent seeing when the visual pair was completely resolved. The new data show the spectral types of ξ UMa A, B to be nearer G0 V and G5 V, suggesting that the lack of a detectable lithium line in component B is explained most simply by its lower temperature and deeper convection zone. At the same time, the core of the Hα absorption feature in the chromospherically active ξ UMa B is noticeably filled by emission, confirming results by Herbig (1985).
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