본문 바로가기 메뉴바로가기

한국천문학회지

1968년 ~ 2019년까지 1,091 건한국천문학회지를 격월간 확인하실 수 있습니다.

  • The Korean Astronomical Society (The Korean Astronomical Society)
  • 계간 (Quarterly)
  • ISSN : 1225-4614 (ISSN : 1225-4614)
  • DB구축현황 : 1,091건 (DB Construction : 1,091 Articles)
안내사항
총 게시글 1,091 페이지 109/110
1081
  • Lee, See-Woo
  • 天文學會誌 = The journal of the Korean Astronomical Society
  • 3, n.1
  • pp.13-16
  • 1970
  • 원문 바로보기
A hyperbolic orbit is expanded in terms of F analogous to the eccentric anomaly of an elliptical orbit: ${\tau}^p\;sinq{\upsilon}\;and\;{\tau}^p\;cosq{\upsilon}$ are expressed in terms of F. The true anomaly ${\upsilon}$ is expressed in terms of F, and F in terms of ${\upsilon}$ .
1082
  • 주광희
  • 天文學會誌 = The journal of the Korean Astronomical Society
  • 2, n.1
  • pp.23-32
  • 1969
  • 원문 바로보기
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.
1083
  • 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- ${\chi}$ ), where ${\chi}$ 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- ${\chi}$ ). The formulae are applied to open star clusters, the globular cluster ${\omega}$ Centauri, and dwarf elliptical galaxies in the Local Group.
1084
  • 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.
1085
  • 김종오
  • 天文學會誌 = The journal of the Korean Astronomical Society
  • 2, n.1
  • pp.41-45
  • 1969
  • 원문 바로보기
1086
  • 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.
1087
  • 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.
1088
  • Chu, Sun-Il
  • 天文學會誌 = The journal of the Korean Astronomical Society
  • 1, n.1
  • pp.29-36
  • 1968
  • 원문 바로보기
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.
1089
  • Nah, Il-Seong
  • 天文學會誌 = The journal of the Korean Astronomical Society
  • 1, n.1
  • pp.51-60
  • 1968
  • 원문 바로보기
1090
  • 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.