Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..502y&link_type=abstract
Astrophysical Journal, Part 1, vol. 230, June 1, 1979, p. 502-518. Research supported by Hale Observatories.
Astronomy and Astrophysics
Astronomy
73
A Stars, Binary Stars, Dwarf Stars, Infrared Astronomy, M Stars, Stellar Spectra, Astronomical Spectroscopy, Emission Spectra, Line Spectra, White Dwarf Stars, X Ray Binaries
Scientific paper
Sharp emission lines of He I and Ca II, a broad emission line of He I, and absorption lines of Na I have been studied in Coude spectroscopy of AM Herculis, the prototype of a new class of X-ray binaries. The absorption system suggests a mass function of 0.071 plus or minus 0.017 solar masses. The red dwarf appears to lie between types M4V and M5V; according to a Roche lobe analysis, the star obeys a normal mass-radius relationship for a lower main-sequence object. The mass of the white dwarf cannot be determined precisely. UV irradiation of the hemisphere of the red star which faces the white dwarf may account for the sharp emission lines. Collisional excitation around the white dwarf may be associated with the broad-line emission system.
Schneider David P.
Young Patrick
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