Joint infrared and visual monitoring of AM Herculis

Details Joint infrared and visual monitoring of AM Herculis Joint infrared and visual monitoring of AM Herculis

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..397p&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Dec. 1, 1978, p. 397-404.

Astronomy and Astrophysics

Astronomy

32

Infrared Astronomy, Variable Stars, Visual Observation, X Ray Stars, Companion Stars, Eclipsing Binary Stars, Light Curve, Phase Deviation, Spectral Energy Distribution, Wavelengths

Scientific paper

Four cycles of the flux from the 3.1 hour X-ray variable AM Her have been observed simultaneously at four wavelengths in the visible and near-infrared. The data show periodic variations at all wavelengths but show systematic changes with wavelength in the relative depths and widths of the primary and secondary minima. The spectral energy distribution varies with phase, being reddest at primary minimum and bluest at the maximum. At primary minimum it is consistent with the energy distribution of an M2 V star plus a component which is flat with frequency; if an M2 V star is present, a lower limit of 100 pc can be placed on the distance to AM Her. The implications of the data on several models for AM Her are discussed.

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