Ultraviolet observations of AM Herculis with IUE

Details Ultraviolet observations of AM Herculis with IUE Ultraviolet observations of AM Herculis with IUE

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l..95r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 1, 1979, p. L95-L98.

Astronomy and Astrophysics

Astronomy

66

Iue, Ultraviolet Astronomy, White Dwarf Stars, X Ray Sources, Binary Stars, Cyclotron Radiation, Magnetic Stars

Scientific paper

Ultraviolet observations of the binary X-ray source AM Herculis from the IUE satellite show strong emission lines of ions from O I to N V, probably originating in photoionized gas, and a continuum which is partially eclipsed in phase with the X-ray eclipse. The emission lines have broad (about 600 km/s) and sharp (about 80 km/s) components at different velocities, as has been seen in optical lines. The continuum is interpreted as two components, a blackbody (blackbody kT of 25-30 eV) which accounts for the X-ray emission below 0.5 keV and the eclipsed part of the UV continuum, and a component which is never eclipsed, whose spectrum is roughly proportional to the inverse of frequency. Strong ultraviolet emission due to optically thick cyclotron emission, which has been predicted theoretically, is not observed. This presents a severe difficulty for the theory of accretion onto the magnetic pole of a white dwarf.

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