Frequency of Bp-Ap stars among spectroscopic binaries

Details Frequency of Bp-Ap stars among spectroscopic binaries Frequency of Bp-Ap stars among spectroscopic binaries

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..341g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. 341-351.

Astronomy and Astrophysics

Astrophysics

39

A Stars, Abundance, B Stars, Eclipsing Binary Stars, Star Distribution, Stellar Spectrophotometry, Peculiar Stars, Stellar Magnitude

Scientific paper

Improving previous studies with more numerous published values, a reexamination has been conducted concerning the binary frequency for Bp-Ap stars, pointing out differences with normal stars for Si, Si-Cr, Si-Sr stars as well as Hew stars, but not for the Hg-Mn and the coolest Ap stars. The period and the eccentricity distributions for Bp-Ap stars have been analyzed, compared to normal stars of various spectral types. Remarkably, this analysis reveals a great deficiency among low eccentricity systems for all the peculiar stars, except the Hg-Mn ones. Also discussed is the synchronism for the systems for which the photometric period is known. Finally, the values of the parameter Delta(V1-G) of the Geneva photometry, which is a measurement of the 5200-A depression, is compared for different binary systems.

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