Bimodal distributions of rotational velocities of late B and A-type stars

Details Bimodal distributions of rotational velocities of late B and A-type stars Bimodal distributions of rotational velocities of late B and A-type stars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..635r&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

Using highly homogeneous v sin i parameters determined for a large sample of late B and A-type stars cleansed from objects presenting the Am and Ap phenomenon as well as from all known binaries, we show that late B and early A-type main-sequence stars have genuine bimodal distributions of true equatorial rotational velocities due probably to phenomena of angular momentum loss and redistribution the star underwent before reaching the main sequence. A striking lack of low rotators is noticed among intermediate an late A-type stars. The bimodal-like shape of their true equatorial rotational velocity distributions could be due to evolutionary effects.

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