CAOSP abstracts, Volume: 50, No.: 2, year: 2020

Author(s): Pavlík, V.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 50, no. 2, p. 456-460.
Date: 3/2020
Title: Primordial mass segregation of star clusters: The role of binary stars
Keyword(s): methods: numerical, data analysis, star clusters: individual (ONC), stars: formation, binaries
Pages: 456 -- 460
DOI: https://doi.org/10.31577/caosp.2020.50.2.456
NASA ADS Abstract Service: 2020CoSka..50..456P
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: Observational results of young star-forming regions suggest that star clusters are completely mass segregated at birth. As a star cluster evolves dynamically, these initial conditions are gradually lost. For star clusters with single stars only and a canonical IMF, it has been suggested that traces of these initial conditions vanish at τ_v between 3 and 3.5 half-mass relaxation times. Here, by means of numerical models, we investigate the role of the primordial binary population on the loss of primordial mass segregation. We found that τ_v does not depend on the binary star distribution, yielding 3 < τ_v / t_rh < 3.5. We also conclude that the completely mass segregated clusters, even with binaries, are more compatible with the present-day ONC than the non-segregated ones.