Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..686s&link_type=abstract
Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 686-694.
Astronomy and Astrophysics
Astronomy
29
Binary Stars, Infrared Astronomy, Light Curve, Optical Emission Spectroscopy, Peculiar Stars, Stellar Spectra, Ultraviolet Spectra, Iue, Stellar Magnetic Fields, Stellar Temperature, Ubv Spectra, Visual Photometry, White Dwarf Stars
Scientific paper
Observations of AM Her during a low state over a wavelength range from 0.12 to 10 microns are reported. These include IUE ultraviolet spectra, light curves at U, B, V, R, J, H, K, and magnitudes at L, M, and N. The UV observations reveal a nearly Rayleigh-Jeans continuum spectral distribution and broad Lyman-alpha absorption from a hot (effective temperature = 50,000 K) white dwarf. Of the strong emission lines present in the high state, only weak C IV (1550 A) and Mg II (2800 A) features remain. The optical light curves are markedly different from the high state, while the infrared light curves are similar in appearance to the high state. The infrared variations cannot be explained solely by the ellipsoidal variations of a secondary star which is heated by an accretion column. The 10 micron flux is less than the high state, but it is not possible to tell if the excess noted during the high state is still present. The large available wavelength range is used to constrain the relative contributions of the white dwarf, the red dwarf, and the accretion columns.
Capps Richard W.
Raymond John C.
Szkody Paula
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