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IC 4665 DANCe: I. Members, empirical isochrones, magnitude distributions, present-day system mass function, and spatial distribution

Abstract : Context. The study of star formation is extremely challenging, due to the lack of complete and clean samples of young nearby clusters and star-forming regions. The recent Gaia DR2 catalogue complemented with the deep ground-based COSMIC DANCe catalogue offers a new database of unprecedented accuracy to revisit the membership of clusters and star-forming regions. The 30 Myr open cluster IC 4665 is one of the few well-known clusters of this age and it is an excellent target where evolutionary models can be tested and planetary formation studied.Aims. We provide a comprehensive membership analysis of IC 4665 and study the following properties: empirical isochrones, distance, magnitude distribution, present-day system mass function, and spatial distribution.Methods. We used the Gaia DR2 catalogue together with the DANCe catalogue to look for members via a probabilistic model of the distribution of the observable quantities in both the cluster and background populations.Results. We obtained a final list of 819 candidate members that cover a 12.4 magnitude range (7 <  J <  19.4). We find that 50% are new candidates, and we estimate a conservative contamination rate of 20%. This unique sample of members allows us to obtain a present-day system mass function in the range of 0.02–6 M⊙, which reveals a number of details not seen in previous studies. In addition, we find that a spherically symmetric spatial distribution is favoured by our final list of members for this young open cluster.Conclusions. Our membership analysis represents a significant increase in the quantity and quality (low contamination) with respect to previous studies. It offers an excellent opportunity to revisit other fundamental parameters such as age.
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https://hal-cea.archives-ouvertes.fr/cea-02324358
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Submitted on : Monday, October 21, 2019 - 9:20:57 PM
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N. Miret-Roig, H. Bouy, J. Olivares, L. M. Sarro, M. Tamura, et al.. IC 4665 DANCe: I. Members, empirical isochrones, magnitude distributions, present-day system mass function, and spatial distribution. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 631, pp.A57. ⟨10.1051/0004-6361/201935518⟩. ⟨cea-02324358⟩

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