On the rotational hypothesis for the quasi-sinusoidal light variations in BY Draconis and EQ Virginis

Details On the rotational hypothesis for the quasi-sinusoidal light variations in BY Draconis and EQ Virginis On the rotational hypothesis for the quasi-sinusoidal light variations in BY Draconis and EQ Virginis

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216...42a&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Aug. 15, 1977, p. 42-48.

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Light Curve, Line Spectra, Stellar Rotation, Stellar Spectra, Dwarf Stars, Flares, Hypotheses, Late Stars, Stellar Magnetic Fields, Variable Stars

Scientific paper

High-resolution echellograms of the supposedly rotating spotted dK-dMe stars BY Dra and EQ Vir have been obtained. These data are directly compared with similar material for three nonemission late-type dwarfs. The absorption lines in the spectrum of EQ Vir are broader than those in the nonemission stars by an amount consistent with its radius and photometric period. Although there is a distinct visual impression of a similar effect in the BY Dra spectra, it is not possible to demonstrate it with any degree of confidence.

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