Membership in the Galactic open cluster NGC 1039 (M34)

Details Membership in the Galactic open cluster NGC 1039 (M34) Membership in the Galactic open cluster NGC 1039 (M34)

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..209i&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 1, p. 209-219.

Mathematics

Probability

15

Color-Magnitude Diagram, Galactic Clusters, Main Sequence Stars, Open Clusters, Binary Stars, Early Stars, Probability Theory

Scientific paper

Proper motions and membership probabilities for 354 stars in the region of NGC 1039 (M34) are presented. A zero-age main-sequence fit the color-magnitude diagram of 89 probable members yields a distance modulus of 8.28. Comparing theoretical isochrones to the color-magnitude diagram of probable members yields in age of approximately 2.5 x 10 exp 8 years. Membership probabilities based on proper motions indicate that all six of the visual binaries and three of the four known Ap stars are members of the cluster. A possible giant member is identified. Evidence for mass segregation via dynamical relaxation is briefly discussed.

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