Bibcode
Lodieu, N.; Pérez-Garrido, A.; Smart, R. L.; Silvotti, R.
Bibliographical reference
Astronomy and Astrophysics, Volume 628, id.A66, 26 pp.
Advertised on:
8
2019
Journal
Citations
66
Refereed citations
61
Description
Aims: Our scientific goal is to provide revised membership lists
of the α Per, Pleiades, and Praesepe clusters exploiting the
second data release of Gaia and produce five-dimensional maps (α,
δ, π, μα cos δ,
μδ) of these clusters. Methods: We
implemented the kinematic method combined with the statistical treatment
of parallaxes and proper motions to identify astrometric member
candidates of three of the most nearby and best studied open clusters in
the sky. Results: We cross-correlated the Gaia catalogue with
large-scale public surveys to complement the astrometry of Gaia with
multi-band photometry from the optical to the mid-infrared. We
identified 517, 1248, and 721 bona fide astrometric member candidates
inside the tidal radius of α Per, the Pleiades, and Praesepe,
respectively. We cross-matched our final samples with catalogues from
previous surveys to address the level of completeness. We update the
main physical properties of the clusters, including mean distance and
velocity, as well as core, half-mass, and tidal radii. We infer updated
ages from the white dwarf members of the Pleiades and Praesepe. We
derive the luminosity and mass functions of the three clusters and
compare them to the field mass function. We compute the positions in
space of all member candidates in the three regions to investigate their
distribution in space. Conclusions: We provide updated distances
and kinematics for the three clusters. We identify a list of members in
the α Per, Pleiades, and Praesepe clusters from the most massive
stars all the way down to the hydrogen-burning limit with a higher
confidence and better astrometry than previous studies. We produce
complete 5D maps of stellar and substellar bona fide members in these
three regions. The photometric sequences derived in several
colour-magnitude diagrams represent benchmark cluster sequences at ages
from 90 to 600 Myr. We note the presence of a stream around the Pleiades
cluster extending up to 40 pc from the cluster centre.
Full Tables A.1, B.1, and C.1 are only available at the CDS via
anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/628/A66
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