Studies of the open cluster M 11. 4. The CM diagram, luminosity function and mass segregation

Details Studies of the open cluster M 11. 4. The CM diagram, luminosity function and mass segregation Studies of the open cluster M 11. 4. The CM diagram, luminosity function and mass segregation

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997cha%26a..21..212s&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 21, Issue 2, p. 212-220.

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

Using the relative proper motions and membership probabilities of 785 stars in the region of the open cluster M 11 (within 25' of the cluster center), we found for the cluster, a distance of 1659 pc, and an age of (1.8 - 2.2) × 108 yr, a radius of about 24.5 pc, a luminosity mass of 4354 Msolar, and a virial mass of 5000 Msolar. A method is proposed to derive the present-day luminosity function from the observed luminosity function. Our analysis shows that, as an open cluster of intermediate age, the cluster stars show quite a clear mass segregation effect in space and that while mass segregation in the velocities does exist, it is not so obvious.

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