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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 9, Issue 2 - Dec 1992
Volume 9, Issue 1 - Jun 1992
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UBV LIGHT CURVES OF
AUR STAR 32 CYGNI
Nha, Il-Seong ; Kim, Yong-Gi ; Lee, Yong-Sam ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 127~134
UBV observations of
Aur star 32 Cyg have been made at the Yonsei University Observatory using the 60-cm Goto relflector for five years, 1988-1992. Observations made during these years cover outside of eclipse phase only. No significant light variation which would represent the secondary eclipse of red supergiant by a hot main sequence star is found. The light levels in three passbands do not show any evidence of the proximate effect of this binary system. Some strong light variations, particularly in U, are discussed with no successful explanation.
RI PHOTOMETRY OF 32 CYGNI
Jeong, Jang-Hae ; Kim, Yong-Gi ; Nha, Il-Seong ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 135~142
Surface activity of the late-type supergiant component of
Aurtype eclipsing binary 32 Cyg has been searched in R and I passbands for 53 nights in the 1991 season. Atmospheric extinctions in these wavelength regions are made and a linear relation between the two coefficients has been found. All the data are standardized and determined the magnitudes and colors of 32 Cyg. R, I and color curves of 32 Cyg at the outside eclipse phase are presented.
SPECTROSCOPIC STUDY OF LONG PERIOD ECLIPSIING BINARY 32 CYGNI
Chun, Mun-Suk ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 143~153
Spectra of the
Aurigae type eclipsing binary system 32 Cygni were taken at the Asiago Observatory. Using the Gaussian fitting method we can estimate the radial velocity and equivalent widths of some metalic lines.
Mg II LINE VARIATION OF 32 CYGNI
Kang, Young-Woon ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 154~164
The Mg II lines been extracted from the IUE archival spectra of 32 Cygni to investigate the effect of the atmospheric eclipse. The UV light curve has been reduced from the continuum flux at the center wavelength of 2807.5
in the IUE spectra. The equivalent width of the Mg II k absoption line has been measured for each spectra. The results of the light variation and flux tracing of the absorption line at the vicinity of the primary eclipse confirmed the atmospheric eclipse. The atmospheric effect lasted until the phase 0.06 in the absorptin line tracing, while it lasted until the phase 0.02 in the UV light curve, respectively.
PHASTE-AND INCLINATION-DEPENDENT LINE PROFILES OF 32 CYGNI
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 165~170
The line profiles of 32 Cyg have been calculated by integrating the equation of transfer numerically. In order to determine the source function the two level atom and complete redistribution were assumed and Sobolev approximation was used. The peaks of line profiles for the phase 0.99 and 0.70 showed redshift and blueshift, respectively. The line profiles had dependence on the inclination of orbital plane. The result with small inclination showed higher flux of line profile.
PHOTOABSORPTION OF X-RAYS IN THE MAGNETIC COMPACT STAR
Kim, Yong-Gi ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 171~182
Radiation due to accretion from an accretion disc around the intermediate polars and photoabsorption of this radiation in the accretion funnel have been taken into account as a phenomenological model to study the physics of the magnetic funnel in the magnetic compact star. The first results show that such a model scenario can be used to estimate some parameters in these systems. Some constraints of this model regarding to the observational data of one intermediate polar, EX Hya, are also discussed.
DUST GRAINS IN THE ENVELOPES OF INFRARED CARBON STARS
Suh, Kyung-Won ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 183~192
We have investigated the properties of dust grains in the envelopes of infrared carbon stars by testing various radiative transfer model spectra with different stellar and enveloped parameters. We have deduced a new opacity pattern for the dust grains reflecting both the experimental data and the model fitting with recent infrared observations. The best pattern we find is very similar to amorphous carbon with a slight modification that could be attributed to some unknown dust grain materials. Unlike oxygen-rich dust grains, the optical properties of carbon grains do not show any reasonable tendency of temperature dependence. We find that the Planck mean values of radiation pressure efficiency factors for the modified amorphous carbon are much larger than those for graphite.
A ROCKET MEASUREMENT OF OZONE CONCENTRATION PROFILE OVER THE KOREAN PENINSULA USING THE KOREAN SOUNDING ROCKET KSR-420S : OZONE DETECTOR, ITS CALIBRATION AND DATA REDUCTION
Kim, Jhoon ; Ryoo, Jang-Soo ; Park, Chang-Joon ; Lim, Heung-Bin ; Lee, Ki-Young ;
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 193~202
The fist sounding rocket in Korea, KSR-420S has been under the development at Korea Aerospace Research Institute (KARI), and is expected to be launched in 1993 to measure the vertical ozone profile over the Korean Peninsula. The KSR-420S is expected to provide the fist in situ measurement of ozone concentrations over the Korean Peninsula. An optical ozone detector has been developed at Korea Research Institute of Standards and Science (KRISS), and its calibration has been completed recently. In this paper, measurement principles of the ozone detector in KSR-420S, its calibration data, ozone measurement procedure and data reduction algorithm are presented with sample calculations.
ATTITUDE DETERMINATION OF MICRO-SATELLITE USING GEOMAGNETISE AND MAGNETOMETER DATA
Journal of Astronomy and Space Sciences, volume 9, issue 2, 1992, Pages 203~212
Geomagnetic data from 3-axis magnetometer and the IGRF model (tilite - eccentric dipole model) were used to determine the attitude of a satellite. We compared the values of the geomagnetic model with the magnetometer data and two attitude angles, called
-angle respectively, were calculated. From these angles we calculated simple bounds,
, on the true attitude angle
, which is used to detemine attitude, between the z-axis and the local vertical. And then we investigated conditions of attitudes of UoSAT-11, 14, 22.