20 Leonis - A triple system with a Delta Scuti variable

Details 20 Leonis - A triple system with a Delta Scuti variable 20 Leonis - A triple system with a Delta Scuti variable

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89..216f&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 89, Apr.-May 1977, p. 216-221.

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14

A Stars, Binary Stars, Stellar Motions, Variable Stars, Orbital Elements, Photographic Plates, Radial Velocity, Stellar Mass

Scientific paper

The known visual double and Delta Scuti variable 20 Leo is shown to be a spectroscopic triple system consisting of a short-period pair having a circular orbit of period 4.15 days and a visual companion with an orbital period near 200 years. Radial-velocity measures obtained with approximately 15-minute time resolution over the two-hour photometric period indicate that the visual companion is the Delta Scuti star. All three stars are classified A8 IV and apparently have similar masses. The 20 Leo system is remarkable in that its components appear to have nearly identical mass, rotational velocity, and evolutionary state, but one star is a Delta Scuti variable while the other two may be marginal Am stars.

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