Praesepe - two merging clusters?

Details Praesepe - two merging clusters? Praesepe - two merging clusters?

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319..956h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 3, pp. 956-962.

Astronomy and Astrophysics

Astronomy

14

Stars: Kinematics, Open Clusters And Associations: Individual: Praesepe

Scientific paper

A membership catalogue for Praesepe was compiled and split into four mass bins. A contour plot indicates the presence of a subcluster some 3pc from the centre of the cluster, of approximately 30Msolar. A tidally truncated King profile was fitted to the remainder of the cluster and the tidal radius is found to be 12.1pc the mass of the cluster (excluding the subcluster) is 630Msolar. From the calculated velocity dispersions we find that the cluster appears to have too much kinetic energy and should be rapidly disintegrating. X-ray data suggest that there may be an age spread between the main core stars and the subcluster stars. This leads us to the conclusion that Praesepe is two merging clusters.

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