Are Binary Separations related to their System Mass?

Details Are Binary Separations related to their System Mass? Are Binary Separations related to their System Mass?

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rmxac..21...58s&link_type=abstract

The Environment and Evolution of Double and Multiple Stars, Proceedings of IAU Colloquium 191, held 3-7 February, 2002 in Merida

Astronomy and Astrophysics

Astronomy

8

Binaries: General, Stars: Formation, Stars: Pre-Main Sequence

Scientific paper

We compile most recent multiplicity fractions and binary separation distributions for different primary masses, including very low-mass and brown dwarf primaries, and compare them with dynamical decay models of small-N clusters. The model predictions are based on detailed numerical calculations of the internal cluster dynamics, as well as on Monte-Carlo methods. Both observations and models reflect the same trends: (1) The multiplicity fraction is an increasing function of the primary mass. (2) The mean binary separations are increasing with the system mass in the sense that very low-mass binaries have average separations around ≈ 4AU, while the binary separation distribution for solar-type primaries peaks at ≈ 40AU. M-type binary systems apparently preferentially populate intermediate separations. Similar specific energy at the time of cluster formation for all cluster masses can possibly explain this trend.

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