Electric Character of Strange Stars

Using the Thomas-Fermi model,we investigated the electric characteristics of a static non-magnetized strange star without crust.The exact solutions of electron number density and electric field above the quark surface are obtained.These results are useful if we are concerned about physical processes near the quark matter surfaces of strange stars.

The Fastest Rotating Pulsar:a Strange Star?

According to the observational limits on the radius and mass,the fastest rotating pulsar(PSR 1937+21)is probably a strange star,or at least some neutron star equations of state should be ruled out,if we suggest that a dipole magnetic field is relevant to its radio emission.We presume that the millisecond pulsar is a trange star with much low mass,small radius and weak magnetic moment.

Radiation and Vertical Structure of Slim Accretion Disk

The vertical structure of the disk should be specified in order to compare the theoretical model with the observed spectrum of active galactic nuclei.AH the existing calculations of vertical structure of the accretion disk were based on the standard model.In this paper the vertical structure of the slim disk is calculated,which may be suitable for wider ranges of parameters.The spectrum for higher accretion rate tends to the universal form Fv oc z/-1 and the universal cutoff energy,which is consistent with the self^similar solution for the case with a super-Eddington accretion rate.

Mean pulse analysis and spectral character study of pulsar PSR B2111+46

PSR B2111+46 is studied and analyzed by the method of Gaussian fit separation of the average profile (GFSAP). It has been observed at six frequencies,408, 610, 925, 1408, 1640, and 4850 MHz, serving as an excellent sample for a multifrequency analysis. Applying the GFSAP method we find that PSR B2111+46 hasfive components in its profile at all six frequencies. The result supports Rankin's 'core-double cone' model in emission region. On the basis of component decomposition, we discuss the geometrical structure of core, inner cone and outer cone, the emission beam radius, the emission region altitude and the geometry symmetry. We also examine the spectrum characteristics of core, inner cone and outercone. It is found that the spectrum of the core is steeper than the inner and outer cone.

Detection of water masers in a sample of 84 IRAS sources

Using a newly installed system on the 25 m telescope of Urumqi Observatory, we searched for H2O maser emission towards 84 IRAS sources including young stellar objects (YSOs) and candidates for OH/IR stars. Water masers were detected in four star formation regions and one envelope of late type of stars for the first time. New water maser components were measured in two sources. In a maser source with no water maser emission detected six years ago, strong maser emission was found at different velocities, showing that there was a new explosion of water maser in this source.

Are there real orthogonal polarization modes in pulsar radio emission?

The orthogonal polarization modes (OPM) have been reported observationally and widely accepted by pulsar researchers. However, no acceptable theory can explain the origin of the OPM, which becomes a mystery in pulsar research field. Here a possible way to solve this mystery is pre-sented. We ask a question: Does there exist any real so-called OPM in pulsar radiation? It is proposed that the ’observed OPM’ in individual pulses could be the results of depolarization of pulsar radiation and the observational uncertainties originated f rom polarimeter in observation. A possible method to check this idea is suggested. If the idea is verified, the pulsar research would be influenced significant-ly in theory and in observation.