Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...368..873m&link_type=abstract
Astronomy and Astrophysics, v.368, p.873-879 (2001)
Astronomy and Astrophysics
Astrophysics
7
Open Clusters And Associations: Individual: Pleiades, Stars: Kinematics, Astrometry
Scientific paper
The classical convergent point analysis is implemented for the Pleiades stars with proper motions in the Tycho-2 Catalogue and X-ray fluxes measured by the ROSAT satellite. It is demonstrated that, with the standard astrometric errors as given in Tycho-2, strong X-ray sources in the cluster (log L_X > 29.1, where L_X is in erg s-1) exhibit a velocity dispersion in one component of only 0.20 km s-1, while the distributions of velocity components of moderate (log LX < 29.1) sources and stars not detected by ROSAT at all are consistent with a velocity dispersion of 0.64 km s-1. The difference is statistically significant at the level of 1.6sigma , or 0.95 confidence limit. This result is a clue to the kinematics/X-ray luminosity segregation, similar to that previously discovered in the Hyades open cluster. It is discussed that the segregation may be caused by a wide spread of ages of the member stars. The occurrence of high X-ray luminosities is found to correlate very well with visual binarity and multiplicity (separations > 10 AU).
Makarov Valeri V.
Robichon Noel
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