Neutron stars formed in Type II supernovae are likely to be initially obscured by late-time fallback. Although much of the late-time fallback is quickly accreted via neutrino cooling, some material remains on the neutron star, forming an atmosphere which slowly accretes through photon emission. In this paper, we derive structure equations of the fallback atmosphere and present results of one-di...

We describe time-tagged observations of the Vela pulsar (PSR B0833−45) with the HST STIS MAMA-UV detectors. Using an optimal extraction technique, we obtain a NUV light curve and crude FUV phase-resolved spectra. The pulse is dominated by complex non-thermal emission at all phases. We obtain approximate spectral indices for the brightest pulse components, relate these to pulsations observed in ...

The transient atoll source 4U 1608–52 had been extensively observed by the Rossi X-ray Timing Explorer (RXTE ) during its 1998 outburst. We analyse its X-ray spectra as a function of inferred accretion rate from both the 1998 outburst and from the non-outburst 1996 and 1998 data. We can fit all the spectra by a model in which seed photons from the neutron star surface are Comptonized in a bound...

X-ray dipping in the black hole binary CygnusX-1, the Galactic jet source GROJ1655-40 and in low mass X-ray binaries is discussed. It is shown that spectral analysis strongly constrains emission models. Measurement of dip ingress/egress times allows the sizes of extended emission regions to be determined, notably for the Accretion Disk Corona which is responsible for Comptonization in X-ray bin...

The interaction of high-velocity neutron stars with the interstellar medium produces bow shock nebulae, where the relativistic neutron star wind is confined by ram pressure. We present multi-wavelength observations of the Guitar Nebula, including narrow-band Hα imaging with HST/WFPC2, which resolves the head of the bow shock. The HST observations are used to fit for the inclination of the pulsa...

We calculate the rate of energy emission by bremsstrahlung of neutrino pairs by electrons moving in the crystalline lattice of ions in dense matter in the crust of a neutron star. Since the periodic potential in the solid gives rise to electronic band gaps which can be as large as about 1 MeV, it is necessary in estimating the bremsstrahlung rate at low temperatures to take into account band st...

We tabulate the ground-state odd-proton and odd-neutron spins and parities, proton and neutron pairing gaps, binding energy, oneand two-neutron separation energies, quantities related to β-delayed oneand two-neutron emission probabilities, β-decay energy release and half-life with respect to Gamow-Teller decay, oneand two-proton separation energies, and α-decay energy release and half-life for ...

Impact of the first-forbidden β decay on the production of A ∼ 195 r-process peak a r t i c l e i n f o a b s t r a c t First-forbidden transition Neutron emission QRPA We investigated the effects of first-forbidden transitions in β decays on the production of the r-process A ∼ 195 peak. The theoretical calculated β-decay rates with β-delayed neutron emission were examined using several astroph...