SIMBAD references

2000A&A...360..997T - Astronomy and Astrophysics, volume 360, 997-1002 (2000/8-3)

On the origin of binaries with twin components.


Abstract (from CDS):

The existence of a statistically significant excess of dwarf binaries with mass ratios from 0.95 to 1, as first noted by Lucy & Ricco (1979AJ.....84..401L), is confirmed by modern data. Excess of such binaries, called twins, is found only for periods shorter than 40 days, and in the 2-30 days period range they constitute 10-20% of the total binary population. Twins must have been formed by a special mechanism. It cannot be a mass transfer in contact pre-main-sequence binaries, fission is also unlikely. As shown by Bate (2000MNRAS.314...33B), accretion onto a close binary shifts mass ratio towards 1, so twins may originate from binaries that became close while still surrounded by massive envelopes. Many twins are members of higher-multiplicity systems and/or clusters, which probably explains an early formation of a close binary by stellar dynamics.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: binaries: general - stars: formation

CDS comments: Table 1 : Numbers 2879 and 2918 are HR, HD 184865 and 184866 misprint for HD 166865, 166866, SBC8 1017 = MM Her, SBC8 1434 = EZ Peg.

Simbad objects: 58

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