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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
페이지 121/122
1201
- 우종옥
- 天文學會誌 = The journal of the Korean Astronomical Society
- 3, n.1
- pp.7-11
- 1970
- 원문 바로보기
Optical thickness of Rosette Nebula for Lyman Continuum is examined with W. Gebel's data. And the effective temperatures of the six exciting 0 stars of the nebula are obtained on the assumption that O stars emit black body radiation. The results are found to be generally in between Spitzers old and revised values.
1202
- Lee, See-Woo
- 天文學會誌 = The journal of the Korean Astronomical Society
- 2, n.1
- pp.1-9
- 1969
- 원문 바로보기
On the instantaneous tidal relaxation approximation, formulae are derived for the ellipticities and virial theorem of a slightly flattened homogeneous rotating cluster (the largest axis of the cluster is directed towards the Galactic center), in terms of the Galactic tidal force and the characteristic intrinsic plus orbital angular velocity. The expression for a purely tidally-determined ellipticity is identical to that for an incompressible fluid body of uniform density. Orbital motion generally contributes significantly to the shape of the cluster. The virial theorem is identical to that for an isolated cluster except that the gravitational potential energy is multiplied by (1-<TEX>${\chi}$</TEX>), where <TEX>${\chi}$</TEX> is a positive tidal correction term. To obtain the actual mass of a cluster, the virial theorem mass based on an isolated cluster should be multiplied by the factor 1/(1-<TEX>${\chi}$</TEX>). The formulae are applied to open star clusters, the globular cluster <TEX>${\omega}$</TEX> Centauri, and dwarf elliptical galaxies in the Local Group.
1203
- Chou, Kyong-Chol
- 天文學會誌 = The journal of the Korean Astronomical Society
- 2, n.1
- pp.10-22
- 1969
- 원문 바로보기
Two-Color photoelectric observations were made at Flower and Cook Observatory, University of Pennsylvania. Since the spectroscopic elements are available for the system, derivation of an absolute physical dimension is now expected to be feasible. Results of computation of the orbital elements lead to a fact that the system shows an annular eclipse rather than a partial which is a finding reported by Shapley.
1204
- 주광희
- 天文學會誌 = The journal of the Korean Astronomical Society
- 2, n.1
- pp.23-32
- 1969
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The photometric orbital elements of the eclipsing variable, RZ Pyxidis, are derived by means of Fourier series from photoelectric observations which were made by Michel Breger (1964). Physical dimensions and a model of the system are suggested here.
1205
- 김종오
- 天文學會誌 = The journal of the Korean Astronomical Society
- 2, n.1
- pp.41-45
- 1969
- 원문 바로보기
1206
- Lee, See-Woo
- 天文學會誌 = The journal of the Korean Astronomical Society
- 2, n.1
- pp.33-39
- 1969
- 원문 바로보기
The gain of internal energy of a star cluster caused by the tidal attraction of our Galaxy is examined. Expressions are derived which include the effects of a two-body orbit and internal motions of the cluster. These formulae are compared with previous results based on (i) uniform rectilinear motion and (ii) neglect of internal motions induced by cluster gravitation(i.e., impulsive approximation), and it is found that these simplifying assumptions generally introduce significant uncertainties.
1207
- Chu, Sun-Il
- 天文學會誌 = The journal of the Korean Astronomical Society
- 1, n.1
- pp.29-36
- 1968
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1. 28 candidates of novae and supernovae were selected from ancient Korean observational records. 2. 4 Supernovae were confirmed. 3. 1 guest star was suspected as the original explosion of Cas A. 4. 9 asterisked positions were suggested for further study in the hope of finding additional supernovae-radio sources.
1208
- 박동현
- 天文學會誌 = The journal of the Korean Astronomical Society
- 1, n.1
- pp.19-27
- 1968
- 원문 바로보기
A simple method for solar-lunar calendar conversion is obtained by means of Meton period for the convinience of the date conversion in the study of the old records of astronomical observations in Korea.
1209
- Chou, Kyong-Chol
- 天文學會誌 = The journal of the Korean Astronomical Society
- 1, n.1
- pp.1-18
- 1968
- 원문 바로보기
The photometric orbital elements of an Algol-type eclipsing variable, DI Pegasi, are derived by means of Fourier transforms from two-color photoelectric observations. The system shows a long term variation of its orbital period, which is interpreted as due to a continuing mass loss mechanism from the secondary component. Physical dimensions and a model of the system are also suggested here.
1210
- 유경노
- 天文學會誌 = The journal of the Korean Astronomical Society
- 1, n.1
- pp.37-50
- 1968
- 원문 바로보기
By comparison and analysis of the optical data of the two galactic clusters of Pleiades and h and x Persei and the radio data of the HI gas clouds which are related with those two clusters, the relative motions of those gas clouds with retpect to the two clusters were obtained. The three theories on the acceleration of HI gas cloud surrounding a star cluster by Blaauw. Oort and Spitzer, and Kahn were examined with the above obtained kinetic data of the Pleiades and the h and x Penei clouds. And it was shown that Blaauw's theory is applicable to the h and x Persoi clouds but not to the Pleiades, that Dart and Spitzer's theory can explain the motions of both clouds, and that Kahn's theory needs more improvement to be a complete one.