The binary frequency of extreme subdwarfs revisited

Details The binary frequency of extreme subdwarfs revisited The binary frequency of extreme subdwarfs revisited

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..247s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, March 1985, p. 247-260.

Astronomy and Astrophysics

Astrophysics

57

Binary Stars, Statistical Analysis, Stellar Evolution, Subdwarf Stars, Data Reduction, Galactic Evolution, Metallicity, Periodic Variations, Radial Velocity, Root-Mean-Square Errors, Star Distribution, Tables (Data)

Scientific paper

Spectroscopic observations of 70 extreme subdwarfs, obtained over a 4-yr period with the 1.8-m telescope at Dominion Astrophysical Observatory, are presented in tables and analyzed statistically along with the data reported by Abt and Levy (AL; 1969) and Crampton and Hartwick (CH; 1972). The data-reduction procedures and statistical techniques employed are explained, and significance limits are established by performing similar analyses for known binary stars. For a subsample of 46 subdwarfs with at least three observations spanning 100 d or more, a binary-frequency lower limit of 20-30 percent and a semiamplitude limit of about 14 km/s are determined, with similar frequencies for a set of 12 subdwarfs with Fe/H less than -1.5 and for the samples of AL and CH. The reasons for the discrepancy between these findings and the low frequencies (0-15 percent) calculated by AL and CH are examined, and a list of binary candidates for observation is provided.

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