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1968년 ~ 2023년까지 1,187 건의 한국천문학회지를 격월간 확인하실 수 있습니다.
- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,187건 (DB Construction : 1,187 Articles)
총 게시글 1,187건
페이지 116/119
1151
- Yun, Hong-Sik
- 天文學會誌 = The journal of the Korean Astronomical Society
- 9, n.1
- pp.1-6
- 1976
- 원문 바로보기
The translational and reactive parts of thermal conductivity of a partially ionized solar magneto-plasma gas have been calculated based on Yun and Wyller's formulation (1972) along with Devoto's theory(1968). The computed results are presented as functions of temperature and pressure for given magnetic field strengths. The results of the calculations show that for most photospheric conditions the magnetic field does not play any important role in characterizing thermal properties of the ionized gas. However, when the gas pressure is low(e.g., P<10 dynes/<TEX>$cm^2)$</TEX>) the field becomes extremely effective even if its strength is quite small (e.g., B<0.1 gauss). The reactive part of the thermal transport is found to be very important when the gas is undertaking active ionization.
1152
- Nha, Il-Seong
- 天文學會誌 = The journal of the Korean Astronomical Society
- 9, n.1
- pp.7-8
- 1976
- 원문 바로보기
Standardized photoelectric magnitudes and color indices of 23 components of 17 visual binaries are presented.
1153
- Minn, Ho-Kee
- 天文學會誌 = The journal of the Korean Astronomical Society
- 9, n.1
- pp.9-14
- 1976
- 원문 바로보기
Godel models of the universe filled with fluid are studied in the framework of the Einstein-Cartan theory of gravitation. It is assumed that the models admit a group of motions simply transitive on space-time. The combined effects of spin and rotation(vorticity) are studied with a particular attention to whether the held equations impose any restriction on alignement of spin direction (a polarized spin distribution). The solutions are found explicitly in a closed form, which show that spin components are vanishingly small except in the direction of z-axis (the compass of inertia) in which they can assume an arbitrary distribution.
1154
- 유경노
- 天文學會誌 = The journal of the Korean Astronomical Society
- 9, n.1
- pp.15-39
- 1976
- 원문 바로보기
188 galactic clusters have been investigated to obtain their luminosity functions. It is attempted to interpret the resulting luminosity functions in regard to cluster formation.
1155
- 이영범
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.11-14
- 1975
- 원문 바로보기
Photoelectric observations were made of four N stars (HD 51208, HD 75021, V 1942 Sgr, and RU Vir) at careful1y chosen discrete wavelengths between <TEX>$7000{\AA}\;and\;11000{\AA}$</TEX> with <TEX>$30{\AA}$</TEX> bandpass width. Their effective temperatures have been derived by fitting the black-body radiation curve to the observed continuum intensities at <TEX>$7800{\AA},\;9000{\AA}\;and\;10800{\AA}$</TEX>. The resulting temperature ranges from <TEX>$2500^{\circ}K\;to\;2900^{\circ}K.$</TEX>. It is probable that almost all the N stars belong to this range of temperature. However, the temperatures of very red N stars can not be well determined due to large variability and redistribution of their radiation energy arising from the graphite shells around them.
1156
- 현정준
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.35-39
- 1975
- 원문 바로보기
Effect of the ratio of mixing length to the pressure scale-height <TEX>${\alpha}$</TEX>=l/HP on the effective temperature has been investigated under some simplifying assumptions. The result is compared with that of the existing model calculations. The role of convection zone in the stellar evolution is briefly summarized.
1157
- 유경노
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.1-2
- 1975
- 원문 바로보기
An improved version of the galatic mass distribution has been derived by increasing the number of shells in each spheroid of our earlier model. It is found that the increase of the number of the shell improves the model considerably, thus making it agree far better with observations.
1158
- Yun, Hong-Sik
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.29-34
- 1975
- 원문 바로보기
Solar electrical conductivity has been calculated, making use of Yun and Wyller's formulation. The computed results arc presented in a tabulated form as functions of temperature and pressure for given magnetic field strengths. The results of the calculation show that the magnetic field does not play any important role in characterizing the electrical conductivity of the ionized gas when the gas pressure is relatively high (e.g., <TEX>$P{\geq}10^4\;dynes/cm^2$</TEX>). However, when the gas pressure is low (e.g., <TEX>$P{\leq}10\;dynes/cm^2$</TEX>), the magnetic field becomes very effective even if its field strength is quite small (e.g., <TEX>$B{\leq}0.01$</TEX> gauss). It is also found that, except for lower temperature region (e.g., <TEX>$T{\leq}10^{4^{\circ}}K$</TEX>), there is a certain linear relationship in a log- log graph between the pressure and the critical magnetic field strength, which is defined as a field strength capable of reducing the non-magnetic component of the electrical conductivity by 20%.
1159
- 정장해
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.15-23
- 1975
- 원문 바로보기
A new technique of photographic observations is developed for the determination of time of minimum light of eclipsing binary. An instrumental system to accomplish the observation is described. With this instrument the atmospheric extinction coefficients in Seoul are observed, and four times of minimum light for Algol and W UMa are determined.
1160
- 유경노
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.3-9
- 1975
- 원문 바로보기
Densities of the three constituent spheroids of the same eccentricity as our earlier model of the Galaxy are assumed to be given by an analytical form of <TEX>$_{{\rho}i}$</TEX>(r)=<TEX>$k_ie^{-m_ir^u{_i}}$</TEX>, where <TEX>$k_i,\;m_i$</TEX>, and <TEX>${\alpha}i$</TEX> are obtained by comparing with the results of the previous model. Using three values of <TEX>$_{{\rho}i}$</TEX>(r) the galactic rotation curve, mass of each spheroid and the whole Galaxy are calculated, and the three dimensional density distribution in the Galaxy is also obtained. The calculated rotation curve of the model Galaxy is in good agreement with the observed curve, and the shape of the cross section of the model Galaxy given by the computed density is very similar to the inferred shape of the spiral galaxies.