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- W2053639619 abstract "view Abstract Citations (162) References (92) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Binary Frequency for AP Stars Abt, Helmut A. ; Snowden, Michael S. Abstract A search was made with coude' spectra of the 62 brightest northern Ap stars for spectroscopic binaries. Orbital elements are given for seven newly discovered binaries. The binary frequency of 40 percent for 15 Hg-Mn stars is roughly normal, but the frequency of 20 percent for 45 Si and Sr-Cr-Eu stars is significantly low. The deficiency cannot be explained by the occurrence of low- mass (1 .( . I o) companions or preferred orbital inclinations. Synchronization of rotational and orbital motions occurs for the few systems with orbital periods less than 6.0 days, but rarely for longer periods. Thus the low rotational velocities of Ap stars do not seem to be due to tidal interactions in binaries. The frequency of visual binaries seems to be normal for all three subgroups of Ap stars. We conclude that for those Ap stars (Si and Sr-Cr-Eu groups) having strong external magnetic fields, the formation of binaries with separations of 10 -10 km is inhibited, but not for the non-magnetic Hg-Mn stars or for any Ap stars in systems with separations of x 1011 km. The evidence for the occurrence of very low-mass ( 0.01 o) companions or short-term (30- minute) nonrandom radial-velocity fluctuations is very weak. Subject headings: binaries - peculiar A stars - visual double or multiple stars Publication: The Astrophysical Journal Supplement Series Pub Date: February 1973 DOI: 10.1086/190265 Bibcode: 1973ApJS...25..137A full text sources ADS | data products SIMBAD (75)" @default.
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- W2053639619 date "1973-02-01" @default.
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- W2053639619 title "The Binary Frequency for AP Stars" @default.
- W2053639619 doi "https://doi.org/10.1086/190265" @default.
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