Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218l.121g&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 218, Dec. 15, 1977, p. L121-L127. Research supported by the Science
Astronomy and Astrophysics
Astrophysics
47
Astronomical Spectroscopy, Binary Stars, Emission Spectra, Spectral Resolution, Stellar Spectra, X Ray Sources, Helium, Helium Atoms, Photon Density, Velocity Distribution
Scientific paper
High-resolution observations of the profiles of the He I 4471-A and He II 4686-A emission lines have been obtained around a complete cycle of the X-ray binary AM Her. The profiles are resolved into broad (B) and sharp (S) components; velocity curves are given for each component for both the He I and He II lines. The velocity amplitude of the B component is about 4 times that of the S component. The two components vary out of phase by 133 (+ or -5) deg. The S component is at conjunction during the soft X-ray eclipse. Implications of these results for models of AM Her are discussed.
Boksenberg Alec
Boroson Todd A.
Greenstein Jesse Leonard
Sargent Wallace L. W.
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