A deep all-sky census of the Hyades
S. Roeser, E. Schilbach, A.E. Piskunov, N.V.Kharchenko, R.-D. Scholz

TL;DR
This comprehensive all-sky survey of the Hyades cluster, using proper motions and photometry, identifies 724 co-moving systems, analyzes their structure, mass segregation, and luminosity functions, and highlights discrepancies with theoretical models for low-mass stars.
Contribution
First deep all-sky survey of the Hyades down to 0.2 solar masses, providing detailed 3D structure, mass function, and insights into cluster dynamics and evolution.
Findings
724 co-moving systems identified
Cluster mass of 435 solar masses
Strong mass segregation observed
Abstract
On the basis of the PPMXL catalogue we perform an all-sky census of the Hyades down to masses of about 0.2 m_sun in a region up to 30 pc from the cluster centre. We use the proper motions from PPMXL in the convergent point method to determine probable kinematic members. From 2MASS photometry and CMC14 r'-band photometry, we derive empirical colour-absolute magnitude diagrams and, finally, determine photometric membership for all kinematic candidates. This is the first deep (r' < 17) all-sky survey of the Hyades allowing a full three-dimensional analysis of the cluster. The survey is complete down to at least M_{K_s} = 7.3 or 0.25 m_sun. We find 724 stellar systems co-moving with the bulk Hyades space velocity, which represent a total mass of 435 m_sun. The tidal radius is about 9 pc, and 275 m_sun (364 systems) are gravitationally bound. This is the cluster proper. Its mass density…
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