Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..612s&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Sept. 1, 1980, p. 612-618. Research supported by the Alfred P. Sloan Foundation
Astronomy and Astrophysics
Astronomy
7
Astronomical Spectroscopy, Binary Stars, Companion Stars, Stellar Magnitude, Stellar Spectra, X Ray Sources, Black Holes (Astronomy), Cygnus Constellation, Stellar Luminosity
Scientific paper
High-precision digital spectra of the HDE 226868/Cygnus X-1 system have been obtained at a variety of orbital phases, using a Digicon photon counting array at the coude focus of the Lick Shane reflector. The spectra have been cross-correlated to search for evidence for the existence of a luminous stellar companion to HDE 226868, as has been suggested by several models where the secondary star is not a black hole. We find no evidence for such a star and place a lower limit on the difference between HDE 226868 and its companion of 4 magnitudes. This limit rules out all of the models for the Cygnus X-1 system calculated by Avni and Bahcall which include main-sequence stars as secondaries rather than black holes. A merit function generally useful for cross-correlation of digital spectra is described.
Harms Richard J.
Katz Jonathan I.
Margon Bruce
Shafter Allen W.
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