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1968년 ~ 2023년까지 1,187 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 : 1,187건 (DB Construction : 1,187 Articles)
총 게시글 1,187건
페이지 118/119
1171
- 강용희
- 天文學會誌 = The journal of the Korean Astronomical Society
- 5, n.1
- pp.7-14
- 1972
- 원문 바로보기
We have investigated the structure of the general relativistic polytrope(G.R.P.) of n=5. The numerical solutions of the general relativistic Lane-Emden functions <TEX>${\upsilon}\;and\;{\theta}$</TEX> for the ratio of the central pressure to the central density <TEX>${\sigma}=0.1$</TEX>, 0.3, 0.5 and 0.8333 are plotted graphically. We may summarize the results as follows: 1. As the invariant radius <TEX>$\bar{\xi}$</TEX> increases, the numerical value of the mass parameter <TEX>${\upsilon}$</TEX> does not approach toward the assymptotic limit, as it does in the classical case <TEX>$({\upsilon}{\sim}{\sqrt{3}})$</TEX>, but it increases continuously with progressively smaller rate as compared with the classical case. 2. When <TEX>$\bar{\xi}$</TEX> is less than <TEX>${\sim}5.5$</TEX>, the value of the density function <TEX>${\theta}$</TEX> drops more rapidly than the classical one, whereas when <TEX>$\bar{\xi}$</TEX> is greater than <TEX>${\sim}5.5$</TEX>, <TEX>${\theta}$</TEX> becomes greater than the classical value. For the greater values of <TEX>${\sigma}$</TEX> these phenomena become significant. 3. From the above results it is expected that the equilibrium mass of the G.R.P. of n=5 must be larger than the classical masse <TEX>$({\sqrt{3}})$</TEX> and the mass is more dispersed than the classical configuration (i.e. equilibrium with infinite radius).
1172
- 박홍서
- 天文學會誌 = The journal of the Korean Astronomical Society
- 4, n.1
- pp.9-16
- 1971
- 원문 바로보기
The asymmetry of received intensity pattern within the bandwidth is derived from the analogy of the intensity distribution of two-slit interference. This suggests that the length of <TEX>$\frac{1}{2}{\lambda}$</TEX> delay line should be adjusted to the slightly upper frequency than the central frequency of the radio telescope with a wide bandwith. Some strange communication signals and man-made noises prevented us from obtaining the discernible information from the observed data for the sun. To overcome this difficulties, it is necessary to alter the operating frequency and site. It will be fo1lowed to measure the angular dimensions of the superposed radio sources by changing the distance between two antennas.
1173
- 이영범
- 天文學會誌 = The journal of the Korean Astronomical Society
- 4, n.1
- pp.1-8
- 1971
- 원문 바로보기
The average velocity, 330km/sec. of the high velocity stars with respect to the galactic center is obtained from the data used by Fricke on the assumption that the rotational velocity of the Local Standard of Rest is 250km/sec. Comparing this value with the escape velocity, 380km/sec, at the solar neighborhood which is calculated from Mestel's model of the Galaxy, it is shown that most of the high velocity stars are bound to the Galaxy and that their average apogalacticon is about 40 kpc from the galactic center. And the fact that stars with radial velocities larger than 63km/sec are missing in the direction of galactic rotation of L.S.R. is interpreted as the result partly of the random distribution of the directions of motion of the high velocity stars and partly of the observational errors.
1174
- 김정흠
- 天文學會誌 = The journal of the Korean Astronomical Society
- 3, n.1
- pp.17-27
- 1970
- 원문 바로보기
1175
- 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.
1176
- Yun, Hong-Sik
- 天文學會誌 = The journal of the Korean Astronomical Society
- 3, n.1
- pp.1-5
- 1970
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The earlier findings on the radiative heating through the umbral walls in large sunspots are further investigated. No significant evidence for the umbra! heating has been found in small-sized sunspot umbrae.
1177
- 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: <TEX>${\tau}^p\;sinq{\upsilon}\;and\;{\tau}^p\;cosq{\upsilon}$</TEX> are expressed in terms of F. The true anomaly <TEX>${\upsilon}$</TEX> is expressed in terms of F, and F in terms of <TEX>${\upsilon}$</TEX>.
1178
- 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.
1179
- 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.
1180
- 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.