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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 83/122
821
- SUN AIQUN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.397-398
- 1996
- 원문 바로보기
Large field spectrographs are severely influenced by atmospheric refraction. LAMOST is a large field multi-object spectroscopy telescope with <TEX>$5^{\circ}$</TEX> field of view, f/5 focus ratio and 20m focal length. There will be 4000 fibers simultaneous on it's <TEX>$\phi$</TEX>1.75m focal plane. Here we discuss the atmospheric refraction effects on LAMOST in two hands. One is the effect of differential refraction across the field, another is the effect of atmospheric dispersion. According to the calculation, we find that: 1. The largest deviation from center within the field is 4.;32' during a 1.5-hour integration at <TEX>$80^{\circ}$</TEX> declination. 2. The directions of deviation are complex, so the deviations can't be decreased by rotating the field. We also give out the atmospheric dispersions.
822
- MINN YOUNG KEY
- Journal of the Korean astronomical society = 천문학회지
- 29, n.1
- pp.75-81
- 1996
- 원문 바로보기
We mapped the <TEX>$^{13}CO$</TEX> line in the dark nebula L134 using the 14-m Taeduck radio telescope with a 57 arcsec beam and one beam spacing. The cloud has a spherical shape with an intensity peak ridge extended from the northwest to the southeast directions. The halfwidth and the radial velocity of the lines peak at the region of the cloud center. The radial velocity decreases from the cloud center towards the north and south directions. The integrated line intensity distributions in the space-velocity plane show some structure and a velocity gradient. The <TEX>$^{13}CO$</TEX> and <TEX>$H_2CO$</TEX> clouds and dark clouds are closely related in space in shape, outer boundary, and intensity peak positions. The <TEX>$^{13}CO$</TEX> integrated line intensity is linearly proportional to the visual extinction.
823
- KIM SANG CHUL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.83-84
- 1996
- 원문 바로보기
824
- DRURY L O'C
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.267-270
- 1996
- 원문 바로보기
The problem of the origin of cosmic rays is considered in an astronomical context and the current observational situation summarised. The evidence for acceleration in supernova remnants is critically examined.
825
- CHA SEUNG-HOON
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.253-254
- 1996
- 원문 바로보기
To understand the dynamical structures of stellar wind bubble, one and two-dimensional calculations has been performed. Using FCT Code with cooling effects and assuming constant mass loss rate and ambient medium density, we could divide stellar winds into the regime of slow and fast winds. The slow wind driven bubble shows initially radiative and becomes partially radiative bubble in which shocked stellar wind zone is still adiabatic. In contrast., the fast wind driven bubble shows initially fully adiabatic and becomes adiabatic bubbles with radiative outer shell. We also determine analytically the onset of thin-shell formation time in case of fast wind driven bubble with power-law energy injection and ambient density structure. We solve the line transfer problem with numerical results in order to calculate line profile of [OIII] forbidden line.
826
- YUAN Q. R.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.55-56
- 1996
- 원문 바로보기
In order to investigate the spatial orientation of the spin vectors of galaxies in the Virgo cluster, we carried out a detailed identification of all the certain and possible member disk galaxies with four UK Schmidt Telescope (UKST) III a-j direct plates digitized by the Automated Plate Measuring System (APM). As a result, a relatively large and complete database with no selection effect of the member galaxies has been established. We provide the APM measured values of the position angle (P.A.) and diameters at the isophotal level of 24.5 <TEX>$m_j / arcsec^2$</TEX>. Based on this newly generated database, an initial study on the spatial orientation of the spin vectors of galaxies in the Virgo cluster is shown.
827
- KIM YONGGI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.235-236
- 1996
- 원문 바로보기
Using a phenomenological model for the accretion onto the magnetic white dwarf, we calclliated some optical line profiles from the magnetosphere of such systems. Line profiles of these systems seem to be produced in the magnetosphere of the compact star due to the reemission of X-ray produced near the stellar surface. Some results of our new calculation and the analysis of these results will be presented. Our results show that the model used here can reproduce the observed optical line profiles and open the possiblity to determine the parameters of individual systems.
828
- CHEN ALFRED B.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.123-124
- 1996
- 원문 바로보기
Snapshots of eight SA and standard fields from low to high galactic latitudes were made using the KPNO 0.9m 2K <TEX>$\times$</TEX> 2K CCD with a limiting magnitude from 19 to 22.5. The purpose of this study is to determine the vertical distribution of stars with respect to Galactic latitude and z-distance in comparison with the model simulation between intermediate population to the 'thick disk' component of scale height of a few kpc. Comparison of the preliminary results between observed and model simulation for 3 of the S fields shows good agreement both in V-mag and B- V color distributions. A bimodal distribution in B- V at high galactic latitude seems to be represented by a halo and 'thick disk' dwarf in the blue and by a normal disk dwarf population in the red.
829
- SAHNI V.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.19-21
- 1996
- 원문 바로보기
We apply topological measures of clustering such as percolation and genus curves (PC & GC) and shape statistics to a set of scale free N-body simulations of large scale structure. Both genus and percolation curves evolve with time reflecting growth of non-Gaussianity in the N-body density field. The amplitude of the genus curve decreases with epoch due to non-linear mode coupling, the decrease being more noticeable for spectra with small scale power. Plotted against the filling factor GC shows very little evolution - a surprising result, since the percolation curve shows significant evolution for the same data. Our results indicate that both PC and GC could be used to discriminate between rival models of structure formation and the analysis of CMB maps. Using shape sensitive statistics we find that there is a strong tendency for objects in our simulations to be filament-like, the degree of filamentarity increasing with epoch.
830
- CANNON RUSSELL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.367-370
- 1996
- 원문 바로보기
Construction of the 'Two-degree Field' (2dF) instrument on the Anglo-Australian Telescope (AAT) is now virtually complete and commissioning is well underway. The key components are described. Several recent milestones are reported, including the first scientific results. Future prospects and plans are discussed.