The Blue Stragglers: At the Interface of Stellar Evolution and Stellar Dynamics

Details The Blue Stragglers: At the Interface of Stellar Evolution and Stellar Dynamics The Blue Stragglers: At the Interface of Stellar Evolution and Stellar Dynamics

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1314...95m&link_type=abstract

INTERNATIONAL CONFERENCE ON BINARIES: In celebration of Ron Webbink's 65th Birthday. AIP Conference Proceedings, Volume 1314, p

Computer Science

Stellar Evolution, Binary Stars, Brightness, Eclipsing Binary Stars, Black Holes, Spectroscopic Binaries, Close Binaries, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Eclipsing Binaries

Scientific paper

Recent extensive radial-velocity surveys of old open clusters have revealed rich spectroscopic binary populations among the blue stragglers. The WIYN Open Cluster Survey of NGC 188 in particular has shown among the blue stragglers: i) a high binary frequency of 76+/-19% (as compared to 23+/-3% for the solar-type main sequence stars) ii) a concentration of orbital periods around P~1000 days, with a range of eccentricities that includes e~0 iii) at least 40% rotating faster (vsin i~10-50 km/s) than old main-sequence stars of similar surface temperature; iv) a bi-modal spatial distribution with distinct core and halo populations; v) underluminosity for their masses.
The very high binary frequency points definitively to an origin in multiple-star systems for most of the NGC188 blue stragglers. In fact, triple systems may play a crucial role in the formation of blue stragglers, perhaps through Kozai processes or through enhancing the rates of dynamical encounters for very hard binaries Finally, if the internal structure, magnetic fields and winds of blue stragglers mimic normal main-sequence stars, with commensurate spin-down times, then our finding that some blue stragglers have not yet spun down can place upper limits on their ages.

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