Contribution to the study of composite spectra. III - Spectral binaries, an intermediate class between visual binaries and spectroscopic binaries

Details Contribution to the study of composite spectra. III - Spectral binaries, an intermediate class between visual binaries and spectroscopic binaries Contribution to the study of composite spectra. III - Spectral binaries, an intermediate class between visual binaries and spectroscopic binaries

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115...23c&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 23-29. In French.

Astronomy and Astrophysics

Astrophysics

23

Binary Stars, Stellar Spectra, Classifications, Least Squares Method, Normal Density Functions, Visual Observation

Scientific paper

The results of a study of distribution of the logarithm of the semi-major axis of the relative orbits of 180 visual binaries are presented. The study was undertaken to establish the existence of an intermediate class of binaries between spectroscopic and visual binaries. The binaries examined were all within 33 pc from the sun. A Gaussian distribution was obtained for the visual and atrometric binaries, while an irregular distribution was present with the spectroscopic binaries. Least squares calculations produced an average separation of 2.4 AU. It is suggested that the small separation distance creates difficulties in detecting spectroscopic binaries, although speckle interferometric techniques may be developed enough to determine if a significant number of the objects are located near the earth.

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