The eccentric, asynchronously rotating, close binary 55 Ursae Majoris

Details The eccentric, asynchronously rotating, close binary 55 Ursae Majoris The eccentric, asynchronously rotating, close binary 55 Ursae Majoris

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..805l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 195, June 1981, p. 805-810.

Other

7

Binary Stars, Main Sequence Stars, Orbit Calculation, Stellar Motions, Stellar Rotation, A Stars, Angular Velocity, Eccentric Orbits, Orbital Elements

Scientific paper

A new orbital solution is derived for the spectroscopic binary 55 UMa. The system is unusual in possessing the shortest known period (2.55385 day) for an orbital eccentricity of 0.43. The rotational velocities of the two components are approximately two and five times the synchronous rotational velocity and this also distinguishes it from other short-period main-sequence binaries. Both components are main-sequence stars with spectral types in the range A5-A9. The composite broadband colors indicate a slight ultraviolet excess for the spectral type and suggest that one component may be metal weak. It is likely that the system will show apsidal motion and a small (perhaps 0.02 mag) ellipsoidal variability.

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