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1968년 ~ 2024년까지 1,211 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 : 1,211건 (DB Construction : 1,211 Articles)
총 게시글 1,211건
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1171
- 조순화
- 天文學會誌 = The journal of the Korean Astronomical Society
- 10, n.1
- pp.3-12
- 1977
- 원문 바로보기
<TEX>$Str\ddot{o}mgren$</TEX>-system colors for 23 OV stars compiled by Crawford have been compared with colors calculated by Mihalas from non-LTE model atmospheres. In this way, effective temperatures of these stars have been determined and plotted against spectral type, <TEX>$c_1$</TEX> (u-b), (b-y), (U-B), and (B-V). Within the accuracy of the observations, effective temperatures derived from the photometry for these 23 main-sequence stars are found to be in good agreement with Contiis spectroscopical temperatures.
1172
- 오규동
- 天文學會誌 = The journal of the Korean Astronomical Society
- 10, n.1
- pp.23-30
- 1977
- 원문 바로보기
식변광성 WZ And에 대한 지금까지 관측 발표된 극심시각을 수집하여 이 별의 수기 변화를 분석하였다. 0-C도에 의한 이 별의 주변화는 JD2418000과 JD243500근처에서 각각 dp/p=<TEX>$+4.24{\times}10^{-6}$</TEX>과 dp/p=<TEX>$-2.46{\times}10^{-6}$</TEX>의 돌발적인 주기 변화를 보였다. WZ And의 주기변화의 모습을 분석하기 위하여 Biermann and Hall(1973)이 제시한 접촉 연섬계로부터 <TEX>$7.42{\times}10^6M_0$</TEX>가 온도가 높은 별(hotter component)로 교환됨을 산출하였다. 이러한 량의 질량교환으로 인한 주기감소를 계산하였다. 질량교환 모델에 의한 JD243500이후의 이론적인 주기로 <TEX>$0^d.69565848$</TEX>를 얻었으며, 관측에 의한 0-C도로부터 얻은 주기 <TEX>$0^d.69566034$</TEX>과 매우 잘 일치하고 있다. 한편, WZ And의 질량비에 의하면 이 별은 온도가 더 높은 별이 Roche lobe를 채우고 있음을 보여주며 이러한 WZ And는 Paczynski(1970)의 접촉연성계의 접화단계에서 Stage II에 있는 별이다.
1173
- 이은성
- 天文學會誌 = The journal of the Korean Astronomical Society
- 10, n.1
- pp.13-22
- 1977
- 원문 바로보기
일진(日辰)의 중국역(中國曆)에서 매우 긴요하게 사용(使用)되고 있다. 이 논문(論文)에서는 (1) 103태양년(太陽年)을 지나면 절기(節氣)에 대하여 일진(日辰)이 되돌아오고, (2) 124년(年)을 지나면 음력일(陰曆日)에 대하여 일진(日辰)이 복소되는 것을 보여주었고, 이와 아울러 (3) 62태양(太陽)마다 월(月)의 대소(大小)가 되풀어 된 것은 것을 발견하였다. 이것들은 태음태양력(太陰太陽曆)에서 메톤 주기에 못하지 않는 흥미 있는 주기(週期)이다.
1174
- Lee, See-Woo
- 天文學會誌 = The journal of the Korean Astronomical Society
- 10, n.1
- pp.31-38
- 1977
- 원문 바로보기
To reduce the instrumental and calibration errors in the photoelectric photometry as much as possible it is necessary to select the optimum photocell voltage and energy attenaution and to observe as many standard stars as possible over the wide range of color, spectral type and air mass.
1175
- 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.
1176
- 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.
1177
- 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.
1178
- 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.
1179
- 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.
1180
- 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.