A spectroscopic study of YY Geminorum

Details A spectroscopic study of YY Geminorum A spectroscopic study of YY Geminorum

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193..389b&link_type=abstract

Astrophysical Journal, vol. 193, Oct. 15, 1974, pt. 1, p. 389-396.

Astronomy and Astrophysics

Astrophysics

57

Astronomical Spectroscopy, Eclipsing Binary Stars, Emission Spectra, Line Spectra, Orbital Elements, Stellar Spectra, Absorption Spectra, Astronomical Maps, Flares, Lagrangian Equilibrium Points, Radial Velocity, Radiant Flux Density, Stellar Rotation

Scientific paper

An extensive series of high and moderate-dispersion spectrograms of the eclipsing, double-lined spectroscopic binary YY Geminorum has been obtained. Radial-velocity measures show a systematic difference in the velocities derived from absorption and emission lines, confirming earlier results of Struve and Zebergs. A coude plate obtained during a flare shows the presence of a narrow, central emission component at H-delta and H-gamma. This is interpreted as due to material at the inner Lagrangian point, temporarily ionized by flare light. From spectroscopic observations of flares and quiescent emission line variations, it is possible to map the location and extent in longitude of the flare-producing and emission-line enhancing regions on each component of YY Gem. The regions are shown to extend from about 20 deg to about 60 deg in longitude, in good agreement with the longitudinal extents of starspots recently calculated for BY Dra and CC Eri by Bopp and Evans. Flare-producing regions on YY Gem can develop and disappear on time scales as short as 1 month.

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