Neutron stars are known to contain extremely powerful magnetic fields. Their effect is deform the shape of star, leading potential emission continuous gravitational waves. The deformation neutron stars, however, depends on geometry and strength their internal field as well composition, described by equation state. Unfortunately, both configuration state unknown, assessing detectability waves fr...

In 2012 it was forty years ago that the discovery of the first X-ray binary Centaurus X-3 became known. That same year it was discovered that apart from the High-Mass X-ray Binaries (HMXBs) there are also Low-Mass X-ray Binaries (LMXBs), and that Cygnus X-1 is most probably a black hole. By 1975 also the new class of Be/X-ray binaries was discovered. After this it took 28 years before ESAs INTE...

A short introduction is given to astrophysics of neutron stars and to physics of dense matter in neutron stars. Observed properties of astrophysical objects containing neutron stars are discussed. Current scenarios regarding formation and evolution of neutron stars in those objects are presented. Physical principles governing the internal structure of neutron stars are considered with special e...

Recent gravitational-wave observations have begun to constrain the internal physics of neutron stars. However, current detection searches for star systems assume that potential stars are low-mass black holes, ignoring any affect on signal due neutron-star physics. We wish create a template bank binary waveforms including effect tidal deformability. we find Fisher matrix, which is commonly used ...

Because of the tremendous densities that exist in the cores of neutron stars, a significant fraction of the matter in the cores of such stars is likely to exist in the form of hyperons. Depending on spin frequency, the hyperon content changes dramatically in rotating neutron stars, as discussed in this paper. PACS. 26.60 +c Nuclear matter aspects of neutron stars – 97.60.Gb Pulsars – 97.60.Jd N...

We present limits to the log N − log S curve for isolated neutron stars, both cooling and accreting neutron stars, which are not active as radio pulsars, as observed with the ROSAT All-Sky Survey and compare it with theoretical expectations. So far, only one isolated neutron star is identified optically among ROSAT sources, namely RXJ185635-3754 (Walter & Matthews 1997). Three more promising ca...

Context. Isolated cooling neutron stars with thermal X-ray emission remain rarely detected objects despite many searches investigating the ROSAT data. Aims. We simulate the population of close-by young cooling neutron stars to explain the current observational results. Given the inhomogeneity of the neutron star distribution on the sky it is particularly interesting to identify promising sky re...

As many as 109 neutron stars populate the Galaxy, but only ≈ 103 are directly observed as pulsars or as accreting sources in X–ray binaries. In principle also the accretion of the interstellar medium may make isolated neutron stars shine, and their weak luminosity could be detected in soft X–rays. Recent ROSAT observations have convincingly shown that neutron stars accreting from the interstell...