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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2001

The centrifugal force reversal and X-ray bursts

Résumé

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 M(R) 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 R* > 1.3 RS, where RS is the Schwarzschild radius. We also argue against the relevance of the rotational-modulation model to the observed frequency modulations.
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Dates et versions

hal-04110953 , version 1 (07-06-2023)

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M. A. Abramowicz, W. Kluźniak, J. P. Lasota. The centrifugal force reversal and X-ray bursts. Astronomy and Astrophysics - A&A, 2001, 374, pp.L16-L18. ⟨10.1051/0004-6361:20010835⟩. ⟨hal-04110953⟩
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