The effect of binary evolution on the theoretically predicted distribution of WR and O-type stars in starburst regions and in abruptly-terminated star formation regions.

Details The effect of binary evolution on the theoretically predicted distribution of WR and O-type stars in starburst regions and in abruptly-terminated star formation regions. The effect of binary evolution on the theoretically predicted distribution of WR and O-type stars in starburst regions and in abruptly-terminated star formation regions.

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317..487v&link_type=abstract

Astronomy and Astrophysics, v.317, p.487-502

Astronomy and Astrophysics

Astrophysics

26

Stars: Evolution, Binaries: Close, Wolf-Rayet, Stars: Early-Type

Scientific paper

We first discuss in detail the massive close binary evolutionary model and how it has to be used in a population number synthesis study. We account for the evolution of case A, case B and case C systems, the effect of stellar wind during core hydrogen burning, hydrogen shell burning, the red supergiant phase and the WR phase, the effect of common envelope evolution in binaries with large periods, the consequences of spiral-in in binaries with small mass ratio, the effect of an asymmetric supernova explosion on binary system parameters using recent studies of pulsar velocities, the evolution of binaries with a compact companion. The parameters entering the population model where close binaries are included, are constrained by comparing predictions and observations of the massive star content in regions of continuous star formation. We then critically investigate the influence of massive close binary evolution on the variation of the massive star content in starburst regions. We separately consider regions where, after a long period of continuous star formation, the star formation rate decreases sharply (we propose to call this an abruptly-terminated star formation region) and we show that also in these regions WR/O number ratios are reached which are significantly larger than in regions of continuous star formation. The most important conclusion of the study is that within our present knowledge of observations of massive stars, massive close binary evolution plays an ESSENTIAL role in the evolution of starbursts and abruptly-terminated star formation regions.

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