Variability of the spectrum of β CrB in the region of the lithium line Li I λ6708Å

Details Variability of the spectrum of β CrB in the region of the lithium line Li I λ6708Å Variability of the spectrum of β CrB in the region of the lithium line Li I λ6708Å

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap.....39....8p&link_type=abstract

Astrophysics, Volume 39, Issue 1, pp.8-14

Astronomy and Astrophysics

Astrophysics

Scientific paper

Some results of observations of the spectrum of the spectroscopic-binary Ap star β CrB in the region of the lithium line Li I λ6708Å are presented. The observations were made at the Crimean Astrophysical Observatory over the period 1993 1995 with the coudé spectrograph equipped with a CCD camera on the 2.6-m telescope. Several factors which can affect the behavior of the lithium blend are examined: stellar rotation, magnetic field, isotopic shift, the binary system, and blending by unidentified elements. The principal result of this work is the detection of variability of the lithium blend Li I λ6708Å over the period of rotation of the star. The variations of the radial velocity Vr, and the FWHM of the lithium blend are reported here for the first time. They indicate either a nonuniform distribution of lithium or a nonuniform distribution of conditions for excitation of the lithium resonance doublet in the complex structure of the strong surface magnetic field. Similar variations are also shown by the lines of the rare-earth elements Gd II λ6702.10 Å, Gd II + Ce II λ6704.3Å, and Ce II + Fe I λ6706.0 Å.

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