Starbursts, binary stars, and blue stragglers in local superclusters and groups. I - The very young disk and young disk populations

Details Starbursts, binary stars, and blue stragglers in local superclusters and groups. I - The very young disk and young disk populations Starbursts, binary stars, and blue stragglers in local superclusters and groups. I - The very young disk and young disk populations

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..635e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Aug. 1988, p. 635-669.

Other

73

Binary Stars, Blue Stars, Disk Galaxies, Star Clusters, Star Formation, Starburst Galaxies, Stellar Evolution, A Stars, Color-Magnitude Diagram, Galactic Rotation, Globular Clusters, Main Sequence Stars, Mass Transfer

Scientific paper

The distributions in the HR diagram with theoretical time-constant loci for stars in several young clusters and superclusters are compared to demonstrate that 'blue stragglers' in these aggregates are most frequently simply single massive (mode B) stars formed in bursts of star formation that occur at discrete intervals in time following the formation of the bulk of the low-mass (mode A) stars in the aggregate. The characteristics of the close binary systems in these aggregates are examined to show that, in several cases, mass transfer by Roche lobe overflow has or will occur and that, in some instances, the system would have appeared as a blue straggler prior to the mass-transfer event, and, in other instances, mass transfer will lead to the identification of the system as a blue straggler. Thus, it is concluded that the blue straggler phenomenon has at least two distinct physical origins: it may originate from delayed formation (starbursts) or from 'delayed evolution' in some close binaries (mass transfer from an evolved primary).

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