Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349..163n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. 163-167.
Astronomy and Astrophysics
Astrophysics
5
Astronomical Photometry, Binary Stars, Light Curve, Stellar Composition, Chromosphere, Fourier Transformation, Least Squares Method
Scientific paper
A search is made for multiple-periodic structure in a major subset of the RS CVn class of chromospherically active, binary-star systems using a rigorous numerical approach appropriate to unevenly spaced, gapped data. The goal is to characterize properly the spectral content of RS CVn binary light curves and evaluate how this information can constrain current models for the system. Thirty-six RC CVn systems were observed down to a statistical noise level of about 0.01 m. Most of the systems exhibit multiple periodic structure; 14 show changes in the photometric period on a timescale of a few hundred days. A preference is found for photometric periods with timescales near the orbital and half-orbital periods. The effect is particularly strong for the shorter period systems and is interpreted as evidence for synchronous, or near-synchronous, rotation.
Nelson Eric R.
Zeilik Michael
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