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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607489.0, MPI für Astronomie / Publikationen_mpia
Simulations of the Hyades
Authors:Ernst, A.; Just, A.; Berczik, P.; Olczak, C.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:Astronomy and Astrophysics
Audience:Not Specified
Abstract / Description:Context. Using recent observational data we present N-body simulations of the Hyades open cluster. <BR /> Aims: We make an attempt to determine the initial conditions of the Hyades cluster at the time of its formation to reproduce the present-day cumulative mass profile, stellar mass and luminosity function (LF). <BR /> Methods: We performed direct N-body simulations of the Hyades in an analytic Milky Way potential. They account for stellar evolution and include primordial binaries in a few models. Furthermore, we applied a Kroupa initial mass function and used extensive ensemble-averaging. <BR /> Results: We find that evolved single-star King initial models with King parameters W0 = 6-9 and initial particle numbers N0 = 3000 provide good fits to the present-day observational cumulative mass profile within the Jacobi radius. The best-fit King model has an initial mass of 1721 M&sun; and an average mass loss rate of -2.2 M&sun;/Myr. The K-band LFs of models and observations show reasonable agreement. Mass segregation is detected in both observations and models. If 33% primordial binaries are included, the initial particle number is reduced by 5% as compared to the model without primordial binaries. <BR /> Conclusions: The present-day properties of the Hyades can be reproduced well by a standard King or Plummer initial model when choosing appropriate initial conditions. The degeneracy of good-fitting models can be quite high due to the large dimension of the parameter space. More simulations with different Roche-lobe filling factors and primordial binary fractions are required to explore this degeneracy in more detail.
Free Keywords:methods: data analysis; stars: luminosity function; mass function; open clusters and associations: individual: Hyades; methods: numerical
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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