On the infant weight loss of low- to intermediate-mass star clusters |
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| Authors: | C Weidner P Kroupa D E A Nürnberger M F Sterzik |
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| Institution: | Departemento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña MacKenna 4860, Macul, Santiago, Chile;Argelander-Institut für Astronomie (Sternwarte), Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany;European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile |
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| Abstract: | Star clusters are born in a highly compact configuration, typically with radii of less than about 1 pc roughly independently of mass. Since the star formation efficiency is less than 50 per cent by observation and because the residual gas is removed from the embedded cluster, the cluster must expand. In the process of doing so it only retains a fraction f st of its stars. To date there are no observational constraints for f st, although N -body calculations by Kroupa, Aarseth & Hurley suggest it to be about 20–30 per cent for Orion-type clusters. Here we use the data compiled by Testi et al., Testi, Palla & Natta and Testi, Palla & Natta for clusters around young Ae/Be stars and by de Wit et al. and de Wit et al. around young O stars and the study of de Zeeuw et al. of OB associations and combine these measurements with the expected number of stars in clusters with primary Ae/Be and O stars, respectively, using the empirical correlation between maximal stellar mass and star cluster mass of Weidner & Kroupa. We find that f st < 50 per cent with a decrease to higher cluster masses/more massive primaries. The interpretation would be that cluster formation is very disruptive. It appears that clusters with a birth stellar mass in the range 10–103 M⊙ keep at most 50 per cent of their stars. |
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| Keywords: | stellar dynamics stars: early-type stars: formation Galaxy: formation open clusters and associations: general |
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