Spectrophotometry of AM Herculis at minimum

Details Spectrophotometry of AM Herculis at minimum Spectrophotometry of AM Herculis at minimum

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93...71p&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Feb.-Mar. 1981, p. 71-76.

Astronomy and Astrophysics

Astronomy

13

Binary Stars, Magnetic Stars, Stellar Spectra, Stellar Spectrophotometry, White Dwarf Stars, X Ray Sources, Absorption Spectra, Atmospheric Heating, Emission Spectra, H Lines, Hot Stars, Line Spectra, M Stars, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Models, Titanium Oxides, Variable Stars

Scientific paper

Spectrophotometric observations of AM Her during its 1980 minimum are reported. The M dwarf in the system is revealed by its TiO bands and domination of the spectrum longward of 6000 A. The blue region of the spectrum reveals a hot, magnetic white dwarf with Zeeman-split hydrogen absorption lines, and emission lines of H, He I, and Fe II. The inferred surface magnetic field of roughly 10 to the 7th gauss permits the presence of an accretion disk in the system. Velocities and intensities of the H emission lines indicate an origin in the X-ray-heated atmosphere of the M dwarf. The continuum light variation in the red appears to result from the heating of the secondary, while the blue light variation probably results from the rotation of the bright spot at the white dwarf's magnetic pole. A self-consistent geometrical model is proposed, in which the minimum state is interpreted as a lull in the rate of accretion onto the white dwarf.

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