Volume 374, Number 2, August I 2001
|Page(s)||L16 - L18|
|Published online||15 August 2001|
The centrifugal force reversal and X-ray bursts
Department of Astronomy and Astrophysics, Chalmers University, 412-96 Göteborg, Sweden
2 Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
3 Université Pierre et Marie Curie, Paris VI, France
4 Institute of Astronomy , University of Zielona Góra, Lubuska 2, 65-265 Zielona Góra, Poland
Corresponding author: J. P. Lasota, firstname.lastname@example.org
Accepted: 13 June 2001
Heyl (2000) made an interesting suggestion that the observed shifts in QPO frequency in type I X-ray bursts could be influenced by the same geometrical effect of strong gravity as the one that causes centrifugal force reversal discovered by Abramowicz & Lasota (1974). However, his main result contains a sign error. Here we derive the correct formula and conclude that constraints on the relation for neutron stars deduced from the rotational-modulation model of QPO frequency shifts are of no practical interest because the correct formula implies a weak condition , where RS is the Schwarzschild radius. We also argue against the relevance of the rotational-modulation model to the observed frequency modulations.
Key words: equation of state / relativity / stars: neutron / X-rays: bursts
© ESO, 2001
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