The atmospheric structure of the O-type supergiant Krzeminski's star and the mass of its companion neutron star Centaurus X-3

Details The atmospheric structure of the O-type supergiant Krzeminski's star and the mass of its companion neutron star Centaurus X-3 The atmospheric structure of the O-type supergiant Krzeminski's star and the mass of its companion neutron star Centaurus X-3

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..974c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 974-994.

Astronomy and Astrophysics

Astrophysics

27

Eclipsing Binary Stars, O Stars, Stellar Atmospheres, Stellar Coronas, Stellar Mass, Supergiant Stars, Neutron Stars, Spectral Energy Distribution, Stellar Occultation, Stellar Spectrophotometry, X Ray Binaries

Scientific paper

We find direct evidence of a coronal layer at the base of the supersonic wind of the O-type supergiant Krzeminski's star (KRZ) in X-ray observations of numerous eclipse ingresses and egresses of its compamon X-ray pulsar Cen X-3. The characteristic shape and energy dependence of these X-ray eclipse transitions can be accounted for by a hybrid corona wind model of the KRZ atmosphere in which the wind is accelerated initially by the thermal pressure gradient in a thin coronal layer and then to hypersonic velocities by radiaflon pressure in the region beyond. We deduce from our data a smaller value of the eclipse half-angle than has been used in previous analyses of the orbital dynamics of the binary and derive from it a larger estimate of the neutron star mass, viz. 1.2 3± 0.60 Msun.

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