Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..218b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, Apr.-May 1980, p. 218-220.
Astronomy and Astrophysics
Astronomy
14
Absorption Spectra, Binary Stars, Line Spectra, Spectrum Analysis, Stellar Spectrophotometry, Variable Stars, Calcium, H Alpha Line, Hydrogen, Orbits, Potassium, Spectrograms, Stellar Rotation
Scientific paper
Spectroscopic observations of the secondary component of the binary system HD 45088 which suggest its characterization as a BY Draconis variable are reported. Coude spectrograms of the system in the blue are observed to show absorption features only from the primary star, with double reversals of the Ca II H and K lines of nearly equal intensities. Red image tube spectra obtained on a subsequent night showed the absorption lines of the cooler secondary near 6400 A, however the H alpha line appears as a single absorption feature. The presence of secondary absorption lines in the red but not in the blue is explained by attributing a spectral type of K5 to the secondary, implying intrinsically very strong Ca II emission, with the H alpha line filled by emission, as in the single BY Draconis variable EQ Vir. It is predicted that the secondary of HD 45088 should exhibit photometric variations with a period near the 6.99-day orbital period, and it is suggested that the primary may also turn out to be a BY Draconis variable.
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