Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..81..357h&link_type=abstract
Astrophysics and Space Science, vol. 81, no. 1-2, Jan. 1982, p. 357-368. Research supported by the University of Alberta and Na
Astronomy and Astrophysics
Astrophysics
5
Eclipsing Binary Stars, Orbital Elements, Stellar Models, Stellar Rotation, Stellar Spectrophotometry, Radial Velocity
Scientific paper
HD193964 = HR7792 = 71 Draconis is a relatively recently recognized naked-eye eclipsing binary. A revised set of spectroscopic orbital elements is presented, and an analysis is conducted of the rotation effect which occurs at primary eclipse, taking into account a large number of higher dispersion spectroscopic observations. The spectroscopic and photometric data are combined to derive a physical model for the system. While systematic measuring errors preclude determination of the rate of rotation from the rotational distortion in the velocity curve, it is shown that the rotation is not synchronous and the axis of rotation is inclined with respect to the perpendicular to the orbital plane. The nature of the rotation and the consistency of the masses and radii with values appropriate to the main-sequence imply that DE Dra is a relatively young and unevolved system. A small age is also indicated by its position in the Galaxy.
Couch Janet S.
Hube Douglas P.
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