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A mechanism for orbital period modulation in close binaries
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1992
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Some eclipsing variables exhibit orbital period modulations of amplitude 10⁻⁵ over decades or longer. The period changes are explained by gravitational coupling between the orbit and shape variations of a magnetically active star, whose deformation is driven by angular‑momentum redistribution during its activity cycle and sustained by a subsurface magnetic field of several kilogauss. Published in The Astrophysical Journal, February 1992, DOI 10.1086/170967.
view Abstract Citations (910) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Mechanism for Orbital Period Modulation in Close Binaries Applegate, James H. Abstract Some eclipsing variables are observed to undergo orbital period modulations of amplitude 10 exp -5 over time scales of decades or longer. These modulations can be explained by the gravitational coupling of the orbit to variations in the shape of a magnetically active star in the system. The variable deformation of the active star is produced by variations in the distribution of angular momentum as the star goes through its activity cycle. The torque needed to redistribute the angular momentum can be exerted by a mean subsurface magnetic field of several kilogauss. Publication: The Astrophysical Journal Pub Date: February 1992 DOI: 10.1086/170967 Bibcode: 1992ApJ...385..621A Keywords: Eclipsing Binary Stars; Orbit Perturbation; Stellar Magnetic Fields; Stellar Orbits; Variable Stars; Angular Momentum; Gravitational Effects; Magnetic Stars; Stellar Activity; Stellar Evolution; Astrophysics; STARS: BINARIES: ECLIPSING; STARS: MAGNETIC FIELDS full text sources ADS | data products SIMBAD (6)