Is HER X-1 really strange?

Details Is HER X-1 really strange? Is HER X-1 really strange?

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...318l..25r&link_type=abstract

Astronomy and Astrophysics, v.318, p.L25-L27

Astronomy and Astrophysics

Astrophysics

6

Stars: Individual: Her X-1, Stars: Neutron Stars

Scientific paper

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.

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