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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
- 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.
1182
- 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.
1183
- 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.
1184
- 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.
1185
- 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%.
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
- 유경노
- 天文學會誌 = The journal of the Korean Astronomical Society
- 6, n.1
- pp.9-14
- 1973
- 원문 바로보기
A simple model of the galactic mass distribution consisting of one sphere and two spheroids with different eccentricities is considered. The resulting model is found to be consistent with the recent observations of the galactic rotation as well as suggested shape of the Galaxy.