The implications of hyperon pairing for the thermal evolution of neutron stars containing hyperons are investigated. The outcome of cooling simulations are compared for neutron star models composed only of nucleons and leptons, models including hyperons, and models including pairing of hyperons. We show that lambda and neutron pairing suppresses all possible fast neutrino emission processes in ...

We find a new mechanism of neutron star radiation wherein thermally excited helical waves of vortices in the superfluid core of a rotating neutron star produce its radiation spectrum. We find that neutron stars with a superfluid core of bosons (bosonic stars) are powerful sources of radio waves, their radiation spectrum is not Planck’s and similar to the spectrum observed from a class of quasi-...

ASTRONOMY AND ASTROPHYSICS HST/FOC observations confirm the presence of a spectral feature in the optical spectrum of Geminga. Abstract. New optical and near-UV HST observations of Geminga are presented. When compared with previous ground-based and HST imaging, the data confirm and better define the presence of an emission feature centered at ∼ 6, 000Å and superimposed on the thermal continuum ...

The double differential emission spectra for fusion-produced alpha-particle and neutron as a function of emission energy and angle relative to the direction of beam injection are examined on the basis of the one dimensional (1D) Boltzmann-Fokker-Planck (BFP) model in beam-injected (non-Maxwellian) deuterium-tritium (DT) plasmas. It is shown that owing to the existence of energetic component in ...

It is now generally accepted that accretion of matter onto a compact object (white dwarf, neutron star or black hole) is one of the most efficient processes in the universe for producing high energy radiations. The efficient conversion of gravitational potential enegy into kinetic energy is believed to be the primary source of power for X-ray binaries and for Active Galactic Nuclei (AGN). An un...

Radio observations of two isolated neutron stars, RX J0720.4–3125 and RX J0806.4– 4132, have been made with the Australia Telescope Compact Array at a frequency of 1.4 GHz. No continuum emission is detected from either object with a 3-σ upper limit of 0.2 mJy. The data were also folded synchronously with the known rotation periods of 8.4 and 11.4 s respectively. No pulsed emission was detected....

Optical spectroscopy and photometry of SN 2006aj have been performed with the Subaru telescope at t > 200 days after GRB060218, the X-ray Flash with which it was associated. Strong nebular emission-lines with an expansion velocity of v ∼ 7, 300 km s were detected. The peaked but relatively broad [OI]λλ6300, 6363 suggests the existence of ∼ 2M⊙ of materials in which ∼ 1.3M⊙ is oxygen. The core m...

The VERDI time-of-flight spectrometer is dedicated to measurements of fission product yields and of prompt neutron emission data. Pre-neutron fission-fragment masses will be determined by the double time-of-flight (TOF) technique. For this purpose an excellent time resolution is required. The time of flight of the fragments will be measured by electrostatic mirrors located near the target and t...

We collate the evidence for rotation-powered neutron stars that are visible as X–ray sources and not as radio pulsars. To date, ten objects have been proposed and one, Geminga, has been confirmed as a pulsar by the detection of 4.2 Hz pulsations. Several indicators have been used to support the proposition that the X–ray sources are isolated neutron stars, including high X–ray to optical/radio ...