A period study of AR Lacertae

Details A period study of AR Lacertae A period study of AR Lacertae

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1784k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1784-1789. Research supported by Yonsei University Observatory, K

Astronomy and Astrophysics

Astronomy

10

Eclipsing Binary Stars, Stellar Orbits, Variable Stars, Bl Lacertae Objects, Light Curve, Orbital Elements

Scientific paper

Fifteen new times of minimum light are presented for AR Lac. Times of minimum light obtained between December 1982 and November 1986 confirm that the period of the system has decreased since the early 1960's. Three possible explanatory mechanisms are examined (abrupt changes of period due to mass transfer, a light-time effect due to a hypothetical third body, and anisotropic mass ejection), but none seem to explain the period variation. A conceptually new way of considering this variation.

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