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Letter to the Editor
Is Her X-1 really strange?
A.P. Reynolds 1,
P. Roche 2 and
H. Quaintrell 2
Received 10 September 1996 / Accepted 15 November 1996
It has recently been proposed that the compact accreting object in the well-studied X-ray binary Hercules X-1 is not a neutron star at all, but a strange star; ie one composed of bulk quark matter. This conclusion has been arrived at by comparing a semi-empirical mass-radius (M-R ) relation for Her X-1 with theoretical M-R curves for neutron and strange stars, and showing that the strange-star models are favoured. However we argue that other data in the literature, and recent observational results (namely new mass and distance estimates) suggest that the hypothesis that Her X-1 is a normal neutron star is not disproved.
Key words: stars:individual:Hercules X-1 stars:neutron stars
Send offprint requests to: A.P. Reynolds
Online publication: July 8, 1998