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Title:
Simultaneous three-channel photometry of AM Herculis - Implications for the optical flickering mechanism
Authors:
Szkody, P.; Margon, B.
Affiliation:
AA(California Institute of Technology, Pasadena, Calif.)
Publication:
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 862-867. (ApJ Homepage)
Publication Date:
03/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Binary Stars, Stellar Spectrophotometry, Ultraviolet Photometry, Visual Photometry, X Ray Stars, Autocorrelation, Cross Correlation, Flicker, Light Curve, Optical Filters, Ultraviolet Filters
DOI:
10.1086/157811
Bibliographic Code:
1980ApJ...236..862S

Abstract

Simultaneous three-channel observations of AM Herculis have been obtained with wide-band U and V filters and a narrow-band He II 4686 A filter over a complete orbital cycle. The e-folding times from autocorrelation analysis are half as long for the 4686 A emission line region as they are for the U and V continuum sources. The cross-correlation functions reveal that the U, 4686 A, and V flickering are strongly correlated, and it is argued that this implies that ionizing radiation is responsible for the flickering, rather than previously suggested competing mechanisms such as clumpiness in the accretion column. Details of the auto- and cross-correlations, including a tendency for short time scale variations to occur first in U light, and characteristic oscillations of time scale of about 80 s in U and V are also discussed.

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