RR Lyncis

RR Lyncis is an eclipsing binary star system in the northern constellation Lynx, one of the closest Algol-type binaries in the northern sky at an estimated distance of about 263 light years. It is faintly visible to the naked eye with a combined apparent visual magnitude of 5.53, dropping to 6.03 during primary eclipse and to 5.90 during secondary eclipse. The system is a detached double-lined spectroscopic binary with an orbital period of 9.95 days and small eccentricity, inclined at 87.5° so both stars eclipse each other once per orbit. The primary is a slightly-evolved Am star with 1.9 solar masses and 2.6 solar radii; the secondary is an F-type main-sequence star with 1.5 solar masses and 1.6 solar radii. The system exhibits pulsation behavior, including Delta Scuti-type and Gamma Doradus-type pulsations, and is about one billion years old.