Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..244h&link_type=abstract
Publications of the Astronomical Society of the Pacific, vol. 106, no. 697, p. 244-249
Astronomy and Astrophysics
Astronomy
3
Absorption Spectra, Chromosphere, Eclipsing Binary Stars, Line Spectra, Stellar Spectra, B Stars, Calcium, Data Reduction, Eclipses, K Stars, Radial Velocity
Scientific paper
The zeta Aurigae binary system 31 Cygni (K4 Ib + B4 V, period = 10.4 years) was observed during egress from chromospheric eclipse in 1982 with 11.3 A/mm coude spectroscopy. A rich chromospheric absorption spectrum was observed, decreasing in strength as the egress progressed. Chromospheric line strengths are consistent with those observed during previous eclipses, indicating no changes in size in the K-star chromosphere. Radial velocities of chromospheric lines were also measured, and are consistent with or a few km/s more negative than the K-star orbital velocity, also consistent with observations made during previous eclipses.
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