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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 95/119
941
- WU XUE-BING
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.231-232
- 1996
- 원문 바로보기
The local instabilities of accretion disks were extensively studied, with the considerations of radial advection, thermal diffusion and different disk geometry, dominated pressure and optical depth. Two inertial-acoustic modes in a geometrically thin, radiative cooling dominated disk depart from each other if very little advection is included. A geometrically slim, advection-dominated disk is found to be always stable if it is optically thin. However, if it is optically thick, the thermal diffusion has no effect on the stable viscous mode but has a significant contribution to enhance the thermal instability.
942
- KIM T.-S.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.39-40
- 1996
- 원문 바로보기
Using the Keck 10 m telescope data with the HIRES spectrograph, we analyzed the evolution of Lyman<TEX>$\alpha$</TEX> forest clouds at z > 2 down to the HI column density <TEX>$10^{12.8}cm^{-2}$</TEX>. The number density per unit column density does not change with redshifts at lower HI cloumn density (<TEX>$N_{HI} < 10^{14}cm^{-2}$</TEX>), while the forest clouds at higher column density disappear rapidly. The cutoff b value, the thermal temperature indicator, increases as redshift decreases. The correlation strength seems to be stronger as redshift decreases.
943
- YERSHOV V. N.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.425-426
- 1996
- 원문 바로보기
A few optical schemes for the future Russian astrometric satellite ('Struve') are discussed. New optical materials and techniques developed at the Vavilov State Optical Institute are planned to be used for the on-board telescopes. Optical characteristics of the reflecting Schmidt and a three - mirror scheme for the on-board telescopes are compared.
944
- MANCHESTER R. N.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.209-211
- 1996
- 원문 바로보기
Recent surveys at Parkes, in particular the 70 cm survey of the southern sky, have discovered many pulsars, including 17 miilisecond pulsars in the Galactic disk. Timing and polarization observations of some of these pulsars are described. The only two pulsars known to be in orbit around massive non-degenerate stellar compamons were also discovered at Parkes, and some recent observational results for these pulsars are also presented.
945
- DEHGHANI M. H.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.285-286
- 1996
- 원문 바로보기
A systematric method of exploring the 'geometrical' and 'non-geometrical' constants of the motion for an arbitrary spacetime is presented. This is done by introducing a series of coupled differential equation for the generators of the symmetry group of Vlasov's equation. The method is applied to the case of the maximaly symmetric spectime, and the geometrical and non-geometrical constants of motion are obtained.
946
- WEE SUN-OK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.147-148
- 1996
- 원문 바로보기
We have estimated a metal abundance of [Fe/H]= -0.48 <TEX>$\pm$</TEX> 0.14 dex, a reddening of E(B- V)= 0.30 mag, an age of 2.0 <TEX>$\pm$</TEX> 0.4 Gyr, and a distance of 7.9 <TEX>$\pm$</TEX> 0.8 kpc for Tombaugh 2 using the Washington filter system.
947
- YAMAOKA HITOSHI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.213-214
- 1996
- 원문 바로보기
We are promoting a supernova(SN) search project with medium size (60cm-105cm) telescopes belonging to public observatories in Japan. The main purpose is to measure the SNe Ia rate, which plays an important role in the chemical and dynamical evolution of galaxies. We expect to measure the SN rate in E/SO galaxies within the <TEX>$35\%$</TEX> error after 2 years run, and the longer run will give the smaller error.
948
- GUHATHAKURTA PURAGRA
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.139-140
- 1996
- 원문 바로보기
949
- LEE C. W.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.161-163
- 1996
- 원문 바로보기
We have studied the response of molecular clouds in the Galactic disk to a rotating bar by conducting Smoothed Particle Hydrodynamics (SPH) simulations for the Galaxy in order to understand the dynamical structures of the Galactic Center (GC) molecular clouds, and their implications. In our study it was found that the structures of GC molecular clouds could be induced by the combined effects of rotating bar potential, the hydrodynamic collisions and gravitational miss collisions between the clouds.
950
- AI GUOXIANG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.415-418
- 1996
- 원문 바로보기
Space Solar Telescope (SST) is a space project for solar research, its main parameters are that total weight 2.0T, sun synchronous polar circular orbit, altitude of the orbit 730KM, 3 axis stabilized attitude system, power 1200W, telemetry of the downlink rate 30Mb/s, size <TEX>$5{\ast}2{\ast}2\;M^3$</TEX>, mission life 3 years. It is expected it will be launched in 2001 or later. The main objective is structure and evolution of solar vector magnetic field with very high spatial resolution. The payloads are consisted of 6 instruments: Main optical telescope with 1-M diameter and diffraction limited resolution 0.1 arc second, EUV imaging telescope with a bundle of four telescopes and 0.5 arc second resolution, spectrometric optical coronagraph, wide band spectrometer, H-alpha and white light telescope and solar and interplanetary radiospectrometer. An assessment study between China and Germany is under operation.