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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693728.0, MPI für Astronomie / Publikationen_mpia
Towards a complete stellar mass function of the Hyades. I. Pan-STARRS1 optical observations of the low-mass stellar content
Authors:Goldman, B.; Röser, S.; Schilbach, E.; Magnier, E. A.; Olczak, C.; Henning, T.; Jurić, M.; Schlafly, E.; Chen, W. P.; Platais, I.; Burgett, W.; Hodapp, K.; Heasley, J.; Kudritzki, R. P.; Morgan, J. S.; Price, P. A.; Tonry, J. L.; Wainscoat, R.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Astronomy and Astrophysics
Start Page:id.A43 (18 pp)
Audience:Not Specified
Abstract / Description:<BR /> Aims: The Hyades cluster is an ideal target to study the dynamical evolution of a star cluster over the entire mass range due to its intermediate age and proximity to the Sun. <BR /> Methods: We wanted to extend the Hyades mass function towards lower masses down to 0.1 M and to use the full three-dimensional spatial information to characterize the dynamical evolution of the cluster. <BR /> Results: We performed a kinematic and photometric selection using the PPMXL and Pan-STARRS1 sky surveys, to search for cluster members up to 30 pc from the cluster centre. We determined our detection efficiency and field star contamination rate to derive the cluster luminosity and mass functions down to masses of 0.1 M. The thorough astrometric and photometric constraints minimized the contamination. A minimum spanning tree algorithm was used to quantify the mass segregation. <BR /> Conclusions: We discovered 43 new Hyades member candidates with velocity perpendicular to the Hyades motion up to 2 km s-1. They have mass estimates between 0.43 and 0.09 M, for a total mass of 10 M. This doubles the number of Hyades candidates with masses smaller than 0.15 M. We provide an additional list of 11 possible candidates with velocity perpendicular to the Hyades motion up to 4 km s-1. The cluster is significantly mass segregated. The extension of the mass function towards lower masses provided an even clearer signature than estimated in the past. We also identified as likely Hyades member an L0 dwarf previously assumed to be a field dwarf. Finally we question the membership of a number of previously published candidates, including a L2.5-type dwarf. Table of canditates is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> ( or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/559/A43">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/559/A43</A>
Free Keywords:open clusters and associations: individual: Hyades; stars: luminosity function; mass function; stars: low-mass; stars: individual: 2MASSI J0230155+270406; stars: individual: 2MASS J05233822-1403022
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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