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- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,211건 (DB Construction : 1,211 Articles)
총 게시글 1,211건
페이지 119/122
1181
- 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.
1182
- 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%.
1183
- 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.
1184
- 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.
1185
- Lee, Woo-Baik
- 天文學會誌 = The journal of the Korean Astronomical Society
- 8, n.1
- pp.25-27
- 1975
- 원문 바로보기
A time of minimum light for VV Orionis has been determined photographically using techniques developed by Jeong. The observed time of minimum light shows that VV Ori exhibits a constant orbital period. The O-C computed with the light elements given by Eaton is found to be <TEX>$-0^d$</TEX>, 0070. An attempt to correct for night-to-night shifts for plates taken on three nights in February and March 1975, was unsuccessful and thus the complete light curve initially planned was not obtained.
1186
- 한욱
- 天文學會誌 = The journal of the Korean Astronomical Society
- 7, n.1
- pp.1-10
- 1974
- 원문 바로보기
The position and magnitude of 1449 stars listed in 'Seoung Kyung' (by Byung Kil Nahm, 1861) are compared with those in modern western star catalogues for their identification. 923 stars out of 1449 stars were identified within the range of accuracy. <TEX>${\Delta}{\alpha}{\leq}20^s.0,\;{\Delta}{\delta}{\leq}1'.0\;and\;{\Delta}m=0\;or\;{\pm}1$</TEX>. When <TEX>${\Delta}{\alpha}\;and\;{\Delta}{\delta}$</TEX> increased to <TEX>${\Delta}{\alpha}{\leq}1^m.\;0,\;{\Delta}{\delta}{\leq}15'.0\;and\;{\Delta}m=0$</TEX> or +1, 399 more stars could be included in the list.
1187
- Nha, Il-Seong
- 天文學會誌 = The journal of the Korean Astronomical Society
- 7, n.1
- pp.16-18
- 1974
- 원문 바로보기
Photolectric observations with B and V filters of the eclipsing binary system V448 Monocerotis are presented. The light curves, which cover 30% of the light cycle, show the variability of this system.
1188
- 이은성
- 天文學會誌 = The journal of the Korean Astronomical Society
- 7, n.1
- pp.19-23
- 1974
- 원문 바로보기
The interpolation formula Chao-ch'a-shn devised for the Chinese calendar, Shou-shih-li, has been shown as the one of the 3rd order polynomial. Its 3 coefficients have been determined from the table of the Sun in Shou-shih-li. Its applications to the moon and planets are also briefly mentioned.
1189
- Yun, Hong-Sik
- 天文學會誌 = The journal of the Korean Astronomical Society
- 7, n.1
- pp.11-15
- 1974
- 원문 바로보기
An attempt has been made to re-evaluate the photospheric iron abundance by comparing computed, theoretical line profiles with observations. Our resulting abundance is found to be in good agreement with that of Garz and Kock (1969), when the logarithmic abundance of iron is taken to be 7.5.
1190
- Chu, Sun-Il
- 天文學會誌 = The journal of the Korean Astronomical Society
- 6, n.1
- pp.19-28
- 1973
- 원문 바로보기
16세기 후반에서 17세기 초에 우리나라에서 관측된 4개의 초신성(Tycho Supernova, Kepler Supernova, Cassiopeia Nova 및 Cassiopeia A)의 기록은 세계 어느 나라 천문관측기록 보다 더 자세히, 또 더 정확히 표시되어 있다. 특히 Kepler Supernova의 기록은 우리나라 이조 왕조실록에 가장 자세하게 실려있다. 위치뿐만 아니라 밝기, 관측시간 및 관측상태를 낱낱이 표기한 이 관측치로부터 다음과 같은 광도곡선상의 특징을 알아낼 수 있다. 1. 준극대광도(Pre-max-halt)는 1604년 10월 20일부터 10월 26일 사이 2. 극대광도(Maximum Luminosity)는 1604년 10월 29일부터 11월6일 사이 3. 천이과정(Transition)은 아마도 1604년 11월 28일부터 1604년 12월 26일 사이에 있었을 것이다.