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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 14, Issue 2 - Dec 1981
Volume 14, Issue 1 - Jun 1981
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A SURFACE PHOTOMETRY OF NEARBY GALAXIES: M106, M31 AND M33
Ann, H.B. ; Yu, K.L. ;
Journal of The Korean Astronomical Society, volume 14, issue 1, 1981, Pages 1~11
Photoelectric drift scans of nearby galaxies, M106, M31 and M33 have been made at diurnal rate with the 61cm Cassegrain Reflector at Sobacksan Observing Station. Luminosity profiles of M106 and M31 show the asymmetries between east and west sides of the galaxies and the near side of each galaxy exhibits a larger B-V color than the far side. B-V color distribution in the central part of MI06 shows somewhat unusual feature of a blue center with red surrounding regions, and this is an opposite trend to the ordinary color distribution of most of external galaxies. B-V color of M31 is nearly constant in the central part of the galaxy while U-B color decreases as the distance from the center increases.
RADIAL ABUNDANCE GRADIENT IN GLOBULAR CLUSTERS
Chun, M.S. ;
Journal of The Korean Astronomical Society, volume 14, issue 1, 1981, Pages 13~17
The observed radial UBV colour variations (both B-V and U-B) of some globular clusters are examined for correlations with radial variations in the integrated spectra. The results show that the presence of a radial colour gradient is correlated with the presence of a gradient of the CN (and possibly the G-band) line strength, in the sense that the CN (and possibly the G-band) is stronger in the centre (where the cluster is redder) and becomes weaker in the outer region of the cluster (where the cluster is bluer). This may suggest that a primordial abundance, possibly nitrogen and carbon gradient was set up in the early stage of cluster formation.
MOLECULAR FORMATION IN SUNSPOTS
Lee, H.M. ; Kim, D.W. ; Yun, H.S. ; Beebe, R. ; Davis, R. ;
Journal of The Korean Astronomical Society, volume 14, issue 1, 1981, Pages 19~35
Calculations of molecular number densities as a function of optical depth in selected umbral, penumbral and photospheric models predict penumbral enhancement of diatomic molecules containing carbon atoms, strong umbral enhancement of oxides, and moderate umbral enhancement of hydrides. The role of CO formation in an oxygen rich atmosphere is discussed.
PHYSICAL CONDITIONS IN DARK INTERSTELLAR CLOUDS: MAGNETIC FIELD STRENGTH AND DENSITY
Hong, S.S. ;
Journal of The Korean Astronomical Society, volume 14, issue 1, 1981, Pages 37~42
In order to know how the magnetic field increases with density in interstellar clouds, we have analyzed observations of extinction and polarization for stars in the
Oph molecular cloud complex. The size of grains in dense parts of the complex is estimated to be larger than the ones in diffuse interstellar clouds by about 15 percent in radii. Employing the Davis-Greenstein mechanism for grain alignment with this estimated grain size, we have put constraints on the exponent in the field-density relation
. It is concluded that magnetic field in gravitationally contracting clouds increases less steeply than the classical expectation based on the approximation of isotropic contraction with complete frozen-in flux.
A Study on Masses of O Stars in HII Regions
Woo, Jong-Ok ;
Journal of The Korean Astronomical Society, volume 14, issue 1, 1981, Pages 43~49
Making use of log
diagram along with Stohers' stellar evolutionary tracks (1972), we estimated the masses of 107 O stars in HII regions, which were selected from the catalogue compiled by Goy (1973). It is found that our estimated masses of O stars range from
and about 20% of them falls in the mass range above
in agreement with earlier findings of Conti et al. (1975).