Problem of two bodies with a generalized potential

Chin. Astron. Astrophys. (1994) 16/Z 233-240 Copyright @ 1994 Elsevier Science Ltd Printed in Great Britain. All rights reserved 0275-1062/94524.00+.00

Pergamon

ABSTRACTS OF OTHER PAPERS SINICA 34/4 (1993) AND ACTA Scanning

equipment

41,

CHUAN-JIN,

WANG

FROM ACTA ASTRONOMICA ASTROPHYSICA 14/l (1994)

for the solar monochromatic He I 10830 spectrum You JIANLu JING, FAN ZHONG-YU Purple Mountain Observatory, Nanjing

210008

This paper describes an equipment for infrared image scanning, attached to the solar spectrograph of Purple Mountain Observatory. Using mosaic method enables us to obtain the monochromatic He I 10830 image. The central frequency, spatial and spectral resolution are all adjustable. Real time He1 10830 line spectrum and continuum over a certain bandwidth are recorded. Various problems in the monochromatic image obtained are discussed. (AAnS, 1993, 34, 374-379). Homogenization of the Chinese Joint Universal Time in 1962-1988 LIAO DECHUN, JIN WEN-JING, Xv TONG-QI, Lu PEI-ZHEN Shanghai Observatory, Shanghai 200030 This paper discusses and gives the corrections required for homogenizing the Chinese Joint Universal Time for the period 1962-1988. The main effect of the change in the aberration constant is a constant term of about 1.7ms; that of the systematic FK5-FK4 catalogue difference is a constant term of about -0.7 ms and an annual term of mean amplitude 1.7 ms; the annual amplitude caused by the change in the nutation model is between 0.5 and 1.5 ms, constrained by the long-period terms of nutation. A comparison shows that, because of the FK5-FK4 systematic difference, the mean yearly discrepancy between the Chinese Joint Universal Time and the B87C02 Series of BIH is slightly increased after the homogenization than before; but the rms fluctuations in most years are reduced. ( AAnS 1993, 34, 397-404). A new method & MAO

WEI

for determining

Yunnan

Observatory,

the tilt of atmospheric Iiunming

isopycnic

layers

FAN YU

650011

According to the principles of absolute determination of instantaneous refraction using the Lower Latitude Meridian Circle now being designed in Kunming, a new method is proposed to determine the tilt of atmospheric isopycnic layers using observations made alternately at the prime vertical and the meridian. Formulae are derived and accuracy is estimated. (AA& 1993, 34, 405-410). The problem of calculating the perturbations in orbital determination of artificial satellites over a long arc LIU LIN & LIAO XIN-HAO department of Astronomy, Nanjing University, Nanjing 210008 It has been customary to use Encke’s method of special perturbation (more precisely, Encke’s transformation in coordinate perturbation) when calculating the orbit of artificial satellites over a long arc. We show that the key lies in the selection of the reference orbit and the numerical method, and does not depend on the use of Encke’s transformation. Stabilization is a more important issue in this problem. (AAnS 1993, 34, 411-422). Problem Observatory,

of two bodies Nanjing

with a generalized

210008;

SUN YI-SUI

potential

Nanjing

FU YAN-NING Purple

University

Mountain

Abstracts

239

We investigate the two-body problem with the inverse k: force law (1 < k < 3), sometimes used in models of globular clusters. Analogous results to the inverse square case are derived. In the bounded case, we give the necessary and sufficient condition for periodic motion; in the unbounded case, we give relevant asymptotic formulae. (AAnS 1993, 34, 423-429). flares observed by the Solar Maximum Mission satellite RIEGER E. Max-Planck Institute of Extraterrestrial Physics, 85748 Garching, Germany, and GAN WEI-QUN Purple Mountain Observatory We list a catalog of solar white-light flares related to the observations by the Hard XSpectrometer (GRS) on SMM. No ray Burst Spectrometer (HXRBS) and the Gamma-ray cause-effect has been found between white-light flares and gamma-ray emissions. It is also noted that not all white-light flares are strong hard X-ray events. For the WLFs which have relatively weak hard X-ray emissions, we find that lower-energy electrons have enough energy to power a WLF of chromospheric origin. For the WLFs which have extremely strong hard X-ray and gamma-ray emissions, we find that the non-thermal electrons (> 700 keV) and protons (> 30 MeV) can play only a limited role in heating the deep layer and in producing photospheric continuum enhuncement. (AAnS 1993,34,430-435. Original Text in English). White-light

A new method JING-XIU Beijing

of calculating the vertical current in solar active Astronomical Observatory, Beijing 100080

regions

WANG

In this Letter, a new method of calculating the vertical current in solar active regions is given. Its applicability to practical data analysis is discussed. (AAnS

1993, 34, 436-438)

On the soft X-ray phase of the Geminga pulsar CHENG LING-XIANG, LI TI-PEI, SUN XUE-JUN, WV MEI, MA Yu-QIAN High-Energy Astrophysics Laboratory, Institute of High Energy Physics, Beijing 100039 and SONG LI-MING Nanjing University We have reanalysed HEAO-8 observation data on Geminga. Significant pulsations are found in the predicted period in energy range 0.03 keV-0.16 keV with single peak structure. Phases of soft X-ray and high energy Gamma-ray were compared. Two results of comparison were given because of the possible 2.272s difference between the HEAO-B spacecraft time and UT: the soft X-ray peak lies either between the two peaks in Gamma-ray phase, or in the valley or in the non-valley area. (AAnS 1993, 34,439-442) A Born-Infeld

type modification

of general

relativity

with maximal

curvature

VENZO DE SABBATA~~‘, C. SIVARAM’~~& WANG DING-XIONG~~~ 1 World Laboratory, Lausanne. 2Departnlent of Physics, University of Ferrara, Italy. 31ndian Astrophysical Institute,

Bangalore,

India.

4Hubei

Institute

for Nationalities,

Enshi,

China

Based on the fact that torsion is related to the fundamental unit of spin h, defects in space-time topology should occur in multiples of the Planck length that follows from the intrinsic defect built into the structure of space-time, implying a minimal fundamental length which, in turn, implies a maximal curvature. This result has some physical consequences: entropy does not become infinite as the collapsing object approaches the Schwarzschild radius and moreover we have also a minimal mass (f 0 and = M,I) of black holes that could form in the early universe or survive as a remnant in the evaporation of larger black holes. (AApS, 1994, 14, 11-15, Original text in English) The

X-ray

spectrum

of the BL Lac object PKS 2155-304 CHEN JUN-FENG~ & of Physics, Shanghai Jiaotong University. 2 Center for As-

YOU JUN-HAN’~~ ‘Department trophysics,

Hefei