The Rotational Rates of Blue Stragglers Produced by Physical Stellar Collisions

Details The Rotational Rates of Blue Stragglers Produced by Physical Stellar Collisions The Rotational Rates of Blue Stragglers Produced by Physical Stellar Collisions

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l.121l&link_type=abstract

Astrophysical Journal Letters v.447, p.L121

Astronomy and Astrophysics

Astronomy

42

Stars: Blue Stragglers, Stars: Interiors, Stars: Pre-Main-Sequence, Stars: Rotation

Scientific paper

Blue stragglers produced from physical stellar collisions are expected to be born rotating rapidly, while the blue stragglers observed in intermediate-age and old star clusters do not. We suggest that the collision and merger of two main-sequence stars results in an object that quickly swells into a pre--main-sequence--like star with a convective envelope, which can spin down via magnetic braking as it approaches its thermal equilibrium configuration. The result is a blue straggler with a rotation similar to that of a normal star of the same mass and age. Consequently, rapid rotation is not a signature of a collisionally merged blue straggler.

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