The galactic cluster NGC 188 - W Ursae Majoris contact binaries as a clue to two separate bursts of star formation

Details The galactic cluster NGC 188 - W Ursae Majoris contact binaries as a clue to two separate bursts of star formation The galactic cluster NGC 188 - W Ursae Majoris contact binaries as a clue to two separate bursts of star formation

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..430m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 430-434. Research supported by CNR and CNRS.

Astronomy and Astrophysics

Astrophysics

4

Binary Stars, Late Stars, Open Clusters, Star Formation, Stellar Evolution, Astronomical Photometry, Main Sequence Stars, Stellar Models

Scientific paper

The problem of the unique richness in W UMa binaries of the galactic cluster NGC 188 is revisited, applying recent results on the dynamical evolution of close binaries (van't Veer and Maceroni, 1988, 1989; Maceroni and van't Veer, 1991). It is shown how the presence of seven contact binaries and the alleged absence of less close ones finds a straightforward explanation in terms of a scenario developed from the properties of field solar type close binaries. The present model of NGC 188 requires: (1) that the dynamical evolution of late-type MS or solar-type close binaries is governed by the loss and transfer of angular momentum, (2) that a second burst of star formation has taken place about 2.5 Gyr ago. This second burst can also explain some other characteristics of this peculiar cluster, for instance, the presence of several blue stragglers, which may be the results of the delayed star formation.

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