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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Astronomy and Space Sciences
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The Korean Space Science Society
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Volume 10, Issue 2 - Dec 1993
Volume 10, Issue 1 - Jun 1993
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KITSAT-1 COSMIC RAY EXPERIMENT-INITIAL RESULTS
Min, K.W. ; Kim, S.H. ; Shin, Y.H. ; Choi, Y.W. ;
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 103~112
The KITSAT-1 was successfully launched on August 11, 1992, into a near circular, 1300-km-high orbit with an
inclination. The satellite carries a solid state detector module to measure the high energy particle flux originating mostly from the inner radiation belt. We describe here the objectives of the experiment, the detector structure, and the preliminary result.
MAGNETIC INTERACTION AND X-RAY ABSORPTION OF THE MAGNETIC COMPACT STARS
Kim, Yong-Gi ;
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 113~122
Using a simple analytic model based on the MHD stability arguments we obtain the size of the magnetosphere for the magnetic compact stars. We assume the ordered, field-aligned flow in the magnetosphere and estimate the wellknown Alfven radius. The dependence of the X-ray absorption in the magnetic funnel on the size of this radius is further considered. We show that such a determination of the magnetic interaction radius can be applied to the reconstruction of X-ray light curves of the magnetic binary stars.
PHOTOELECTRIC OBSERVATIONS AND UBVRI LIGHT CURVES ANALYSIS OF ALGOL
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 123~145
UBVRi photometry of Algol was carried out from December of 1988 to March of 1991 at Chungbuk National University Observatory and a total of 3465 observations in U, B, V, R, I were obtained. Three times of primary minimum light of JDH el 2447898.0938, JEH el 2448265.1205 and JDH el 2448288.0598, and two secondary minimum light of JDH el 2447808.1014 and JDH el 2448275.146 were determined from our observations. We analyzed simultaneously the UBVRI light curves of the Algol system with the Wilson-Devinney method for the determination of the photometric parameters. Indivisual masses for the 3 components of Algol are derived as
=1.6 in solar mass and radii as
=0.76 in solar radinus using i=
=0.2512 of our solution and some parameters of the spectroscopic solution of Hill et al. (1971). Our results is simiar to those reported by Kim (1989). The temperature of Algol C,
=8800 was obtained by means of fitting
of five colors to Planckian curve, and
is derived from its result. It is believed that its semidetached configuration of Algol A and B is the consequence of case B mass transfer. According to its location in a mass-radius diagram. Algol b may have evolved significantly in its Hburnning phase.
LINE PROFILES DEPENDENT ON THE OPACITY PARAMETER IN AZ CAS
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 146~151
S/W DEVELOPMENT OF HIGH PRECESION EPHEMERIS(I)
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 152~162
We developed the S/W which calculate the Planetary and the Moon ephemerides. The ephemeris of the Solar system objects was obtained from a simultaneous numerical integration of the equations of motion for the nine planets and the Moon. The mathematical model includes contributions from (1) point-mass interactions (2) figure effect (3) earth tides (4) the orientations of the Earth and the Moon. The calculated ephemerides are compared with DE200 data produced by JPL (Jet Propulsion Laboratory).
THE CAUSTICS AROUND A LOCAL DENSITY PERTURBED REGION IN REDSHIFT SPACE AND THEIR IMPLICATIONS TO RICH CLUSTERS OF GALAXIES
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 163~188
On the framework of Tolman spacetime model, the caustics around a local perturbed region in redshift is due to the local expansion rate induced by a local density inhomogeneity in real space. We have compared the caustics in redshift space, which are analytically obtained, with the observed redshift-distance patterns of galaxies which are belonging to Coma and Perseus clusters. For the Abell density distribution model and polytropic density profiles which are well-fitting the optical and X-ray observations, respectively, the size of caustics which is defined by "turnaround radius" of a local density perturbed region should give constraints on the sizes and masses of rich clusters and give also a clue to understand the state of hot X-ray emitting gas.
PRECISE RANGE DETERMINATION USING LASER RANGING DATA OF LAGEOSE II
Journal of Astronomy and Space Sciences, volume 10, issue 2, 1993, Pages 189~196
Satellite laser ranging observation of LAGEOS II has been performed using the SLR System at Sheshan Laser Ranging Station, Shanghai Observatory. And we obtained 1,838 observational points. The observed range data is corrected by means of system delay correction using ground target observation, atmospheric refraction delay correction, offset correction, general relativistic correction and tide correction including solid tide, polar tide and ocean tide. As a result, the determined range delay mean value is 19.12m and the mean internal accuracy by means of polynomial fitting and least square method is
7cm. Corrected observational points are 1,340 and noise ratio to total observational points is 27.1%.