Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172l..20v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. L20-L22.
Astronomy and Astrophysics
Astrophysics
23
Globular Clusters, Mass Ratios, Neutron Stars, Radii, X Ray Sources, Equations Of State, Hydrogen, Spectrum Analysis, Stellar Composition, Stellar Mass
Scientific paper
From the spectral evolution of seven X-ray bursts observed from 4U/MXB 1820-30 (Haberl et al., 1986) during the phases of photospheric expansion and cooling, the authors derive constraints on the mass-radius relation of the neutron star in this system, taking into account the uncertainty in the source distance, and the possible anisotropy in the source distance, and the possible anisotropy of the burst emission. If during bursts with radius expansion the outers layers of the neutron star are of a hydrogen-poor composition, none of the current equations of state of high-density matter is excluded. For a hydrogen-rich composition only very soft equations of state are allowed.
Lewin Walter H. G.
Paradijs Jan van
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