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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Astronomical Society
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Journal DOI :
The Korean Astronomical Society
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Volume & Issues
Volume 25, Issue 2 - Dec 1992
Volume 25, Issue 1 - Jun 1992
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EFFECTS OF DIFFERENTIAL ROTATION ON THE CO LINE PROFILES
Park, Y.S. ; Yun, H.S. ; Hong, S.S. ; Lee, H.M. ;
Journal of The Korean Astronomical Society, volume 25, issue 2, 1992, Pages 67~78
Effects of cloud rotation 011 the profiles of CO J=
lines arc investigated by theoretically general ing line profiles under physical conditions similar to t he ones in large globules. The synthesized profiles are presented and their characteristics are discussed. It is found that when the Doppler shift of the observed CO lines is interpreted as the rotation velocity, the optically thin
lines underestimate the rotation velocity by up to 10 percents, while the self-reversed optically thick
lines overestimate the velocity up to 20 percents. The optically thin line is shown to be of use in probing the distribution of rotation velocity in dark globules.
ASTROPHYSICAL APPLICATION ON THE GRAVITATIONAL MICRO-LENSING EFFECT (Flux factor K-value and its application)
Chang, Kyong-Ae ;
Journal of The Korean Astronomical Society, volume 25, issue 2, 1992, Pages 79~90
The physical properties of the flux factor K and its application are discussed in connection to the high amplification events. The effects due to random motions of stars in a foreground galaxy are examined in the frame work of moving caustics of gravitational microlenses.
UBV PHOTOELECTRIC PHOTOMETRY OF OPEN CLUSTER M35
Sung, Hwan-Kyung ; Lee, See-Woo ;
Journal of The Korean Astronomical Society, volume 25, issue 2, 1992, Pages 91~104
New photoelectric UBV Photometry of 112 stars in open cluster M35 field was obtained. The distance modulus and age of the cluster are
, respectively. The internal differential reddening within the cluster is apparent.
ON THE SPACING PATTERN OF PLANETS AND SATELLITES
La, Daile ;
Journal of The Korean Astronomical Society, volume 25, issue 2, 1992, Pages 105~109
We show that spacing patterns of planets and satellites in the solar system are formulatable in a single form. It is suggested that a possible explanation for the rule might be the orbital resonance effect, which has existed at an earlier epoch of the solar (planet) system. By extrapolating the formulated spacing patterns beyond the sun-Pluto distance, we find the sun-Planet X distance falls in a range (
) A. U..
INFRARED EMISSION FROM SPHERICAL DUST CLOUDS
Lee, Hyung-Mok ; Hong, Seung-Soo ; Yun, Hong-Sik ; Lee, Sang-Gak ;
Journal of The Korean Astronomical Society, volume 25, issue 2, 1992, Pages 111~128
Infrared emissions from spherical dust, clouds are calculated using quasi-diffusion method. We have employed graphite-silicate mixture with power-law size distribution for the dust model. The grains are assumed to be heated and cooled by radiative processes only. The primary heating source is diffuse interstellar radiation field. hut the cases with an embedded source are also considered. Since graphite grains have higher temperature than silicate grains, the observed IR emission is mainly due to graphite grains, unless the fraction of graphite grains is negligibly small. The color temperature of Bok globules obtained from IRAS 60 and
data are found to be consistent with the dust cloud with graphite-silicate mixture exposed to average interstellar radiation field. The color temperature is sensitive to the external radiation field, but rather insensitive to the size distribution of the grains. We found that the density distribution can be recovered outside the beam size using the inversion technique that assumes negligible optical depth. However, the information within the beam size is lost for if beam convolved intensity distributions are used in deriving density profile.