A Study on the Orbital Period Variation of AR Lacertae | Zendy

Ye Lu | Zendy; Fu-Yuan Xiang | Zendy; Xiao-Min Shi | Zendy

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A Study on the Orbital Period Variation of AR Lacertae

Author(s) -

Ye Lu,

Fu-Yuan Xiang,

Xiao-Min Shi

Publication year - 2012

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/64.4.84

Subject(s) - physics , orbital period , astrophysics , light curve , variation (astronomy) , period (music) , stars , oscillation (cell signaling) , orbital elements , astronomy , biology , acoustics , genetics

In this paper, we collect all available times of the light minimum of AR Lac from the literature and databases. Through an analysis of the O - C curve by a weighted least-squares method, we found that the orbital period of the system shows a cyclic oscillation with a period of 50.93 yr superimposed on a long-term secular period decrease at a rate of dP/dt = -(2.128 +/- 0.060) x 10(-9) d/d. Since both components of AR Lac are late-type stars, and show strong Ca H and K emission lines, the orbital period variation may be caused by the magnetic activity of the system.

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