D. Barthes et al., VISUAL VERSUS NEAR-INFRARED VARIABILITY OF R-FOR - EVIDENCE FOR A MULTIPERIODIC CIRCUMSTELLAR MODULATION, The Astronomical journal, 111(6), 1996, pp. 2391-2402
Long-term AAVSO visual observations and near-infrared data on the carb
on-rich long-period variable star R For have been analyzed. We find th
at the Fourier development of the light curve depends on the observati
on wavelength. For most components-including the main one-the amplitud
e decreases from the visible to the near-infrared. The most sensitive
components to the band correspond or are related to frequencies that a
re close to subharmonics of the main periodicity. We propose that this
may be the result of a multiperiodic modulation of the light curves d
ue to circumstellar dust shells, as predicted by theoretical models. (
C) 1996 American Astronomical Society.