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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
1
Armagh Observatory, College Hill, Armagh, BT61 9DG, Northern Ireland
2
Astronomical Institute, Utrecht University, Princetonplein 5, 3584 CC, Utrecht, The Netherlands
3
Argelander-Institut f¨ur Astronomie der Universit¨at Bonn, Auf dem H¨ugel 71, 53121 Bonn, Germany
4
Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands
5
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