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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
The nature of B supergiants: clues from a steep drop in rotation
rates at 22 000 K
The possibility of Bi-stability braking
Jorick S. Vink1, I. Brott2, G. Gr¨afener1, N. Langer3, A. de Koter2,4, D.J. Lennon5
Armagh Observatory, College Hill, Armagh, BT61 9DG, Northern Ireland
Astronomical Institute, Utrecht University, Princetonplein 5, 3584 CC, Utrecht, The Netherlands
Argelander-Institut f¨ur Astronomie der Universit¨at Bonn, Auf dem H¨ugel 71, 53121 Bonn, Germany
Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands
ESA, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
the date of receipt and acceptance should be inserted later
Abstract. The location of B supergiants in the Hertzsprung-Russell diagram (HRD) represents a long-standing problem in
massive star evolution. Here we propose their nature may be revealed utilising their rotational properties, and we highlight a
steep drop in massive star rotation rates at an effective temperature of 22 000 K. We discuss two potential explanations for it. On


Source: Armagh Observatory


Collections: Physics