A solution of the puzzling symbiotic X-ray system 4U 1700+24

Abstract

A circumstellar corona is proposed for a strange quark-cluster star during an accretion phase, that could be essential to understand the observations of the puzzling symbiotic X-ray system, 4U 1700+24. The state of cold matter at supranuclear density is still an important matter of debate, and one of the certain consequences of strange star as the nature of pulsars is the self-bound on surface which makes extremely low-mass compact objects unavoidable. In principle, both the redshifted O VIII Ly-$\alpha$ emission line and the change of the black-body radiation area could be understood naturally if 4U 1700+24 is a low-mass quark-cluster star in case of wind-accretion.

A version accepted by RAA

References in corpus (5)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Frequency-dependent spontaneous emission rate from CdSe and CdTe nanocrystals: influence of dark states
• Non-Detection of Gravitationally Redshifted Absorption Lines in the X-ray Burst Spectra of GS 1826-24
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• Simultaneous constraints on the mass and radius of Aql X-1 from quiescence and X-ray burst observations
• The optical/UV excess of X-ray-dim isolated neutron star II. nonuniformity of plasma on strangeon star surface
• Trinity of Strangeon Matter
• Strange Matter
• Strangeon Stars