Ke-liang Huang

Optical variability of the medium-bright quasar sample

A variability study of the 32-member Medium-Bright Quasar Sample is reported. It is found that the star US 1953 has undergone a noticeable variation in the course of 26 hr. Apparent variations in the extragalactic object US 3498 may be illusory, owing to its partially resolved appearance. No other evidence for variability was detected. 34 refs.

Faint blue objects at high galactic latitude. IV - Palomar Schmidt fields centered on selected areas 55 and 94

Les objets a exces UV ont ete selectionnes dans les champs Palomar Schmidt centres sur les aires selectionnees 55 et 94. On donne les classes de couleur, les sous-classes et les magnitudes et positions approchees des objets selectionnes

Stability of stellar structure in non-equilibrium thermodynamics. I. the PPI reaction

Abstract Using Prigogines stability criterion of excess entropy production in non-linear and non-equilibrium thermodynamics, we re-examined the stability of stellar structure with respect to the PPI reaction in solar type stars. We show that the star is stable if the relative mass abundence of Hydrogen to Helium is less than 8.9, a condition which is amply satisfied by the normal stars.

The meteor physics of the SL9-Jupiter collision☆

Abstract The collision of Comet Shoemaker-Levy 9 with Jupiter is essentially a problem of meteor physics. From the basic equations of meteor physics we derive, for the fragments, the height profiles of their velocity, mass loss, luminosity, electron line density and energy release rate. It is shown that the initial mass of the largest fragment is of the order of 10 16 and the fragments did not penetrate into the H 2 O layer due to airburst.

The evolution of the galactic z-distribution of pulsars

Abstract In the present paper we try to determine the relation of the z-distribution and the ages of pulsars. Using the model of the gravitational field of Galaxy, we calculate the z-scale-height of pulsars which have given initial place and speed distributions, under the Monte Carlo simulation method. We also compare the results with the observed data.

VARIABLE BLUE OBJECTS IN KAPTEYN SELECTED AREA 94

Abstract We present a list of ultraviolet excess objects in the Palomar Schmidt field centred on Kapteyn Selected Area 94. All these objects were selected on the basis of optical variability. They can serve as quasar candidates.