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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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Journal DOI :
The Korean Space Science Society
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Volume & Issues
Volume 8, Issue 2 - Dec 1991
Volume 8, Issue 1 - Jun 1991
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ATMOSPHERIC ECLIPSING BINARY ZETA AURIGAE IN THE 1987-1988 ECLIPSE (II)
Nha, Il-Seong ;
Journal of Astronomy and Space Sciences, volume 8, issue 2, 1991, Pages 125~131
UBV observations at Yonsei University Observatory (500 and 537 observations each at Ilsan Station and at Campus Station) were made for the latest eclipse of
Aur in 1987-1988. Orbital period of Saijo and Saito has been confirmed and the light and color variations on the night JD 244730 are found.
PHOTOMETRIC STUDY OF EXTREME LONG PERIOD ECLIPSING BINARY 31 CYG
Journal of Astronomy and Space Sciences, volume 8, issue 2, 1991, Pages 133~140
The UBV light curves of an extreme long period binary star 31 Cyg are made with the observations obtained at Yonsei University Observatory for three seasons from 1988 to 1991 and the RI light curves are also made for one season in 1990-1991. The new combined UBV light curves of 31 Cyg are constructed with You's and collected data. A preliminary solution of the light curves of 31 Cyg is made using Wilson-Devinney codes.
ORBITAL EVOLUTION OF SPACE DEBRIS
Journal of Astronomy and Space Sciences, volume 8, issue 2, 1991, Pages 141~148
In order to obtain a complete picture of the time dependent dynamic of 360 fragments in space, the program IODS (ISSA Orbit Determination System) has been set up. Using The program IODS, all fragments orbits of one break-up event can be generated. Perturbations due to the Earth's asymmetrical potential, the Sun, moon, air drag and solar radiation force are considered. We summarize our results as follows : I) Due to J2 term, precessional motion of all fragment orbits are (수식생략) ii) The other perturbations have very small effects.
LIGHT CURVE VARIATIONS OF AR LACERTAE
Nha, Il-Seong ;
Journal of Astronomy and Space Sciences, volume 8, issue 2, 1991, Pages 149~158
Sixteen unitary Light curves of AR Lac in B and V are made at Yonsei University Observatory in the period of 1980-1988. Some overview findings of light variations are made. (1) The light variation outside eclipse follow none of the wave migration patterns reported by previous investigators. (2) Complicated shapes outside eclipse are apparently much reduced in the light curves of 1983-1984. This suggests than, in the future, AR Lac has a chance to attain a normal state with no complicated interactions. (3) The depths of the primary and the secondary mid-eclipses are changing year-to-year. (4) The K0 star, the larger component, has brightened by
14 in V, while the G2 star has shown a fluctuation of about
05 in V. (5) The B-V values at primary mid-eclipse have no correlation with the depth variations. (6) Independently of the increase of maximum brightness, the B-V colors in the non-eclipsed phases changed slightly over the years.