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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 91/122
901
- ITOH NOBUNARI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.379-380
- 1996
- 원문 바로보기
We have constructed a near-infrared imaging camera which is attached to the prime focus of 105cm Schmidt telescope at Kiso Observatory. The camera is equipped with a 1040<TEX>$\times$</TEX>1040 PtSi CSD array developed by Mitsubishi Electric Co. The combination of Kiso Schmidt and the array gives a wide field of view of 18.4'<TEX>$\times$</TEX>18.4' with a reasonable spatial resolution of 1.06' /pixel. The system performances of the camera have been evaluated through laboratory and observational tests. Low noise, good cosmetics(no defect pixels), and good stability of the camera system show an excellent performance for astronomical use.
902
- WEE SUN-OK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.145-146
- 1996
- 원문 바로보기
We have estimated a metal abundance of [Fe/H]= -0.04 <TEX>$\pm$</TEX> 0.05 dex, a reddening of E(B- V)= 0.28 mag, an age of 1.1 <TEX>$\pm$</TEX> 0.1 Gyr, and a distance of 2.5 <TEX>$\pm$</TEX> 0.2 kpc for NGC 1245 using the Washington filter system.
903
- ZHOU WENGE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.403-404
- 1996
- 원문 바로보기
This paper describes a plan of a new IR phace-shfting interferometric system for testing astronomical aspheric mirror which has big departure from the best fit reference sphere during fine grinding. In this experimental system, some new technology will be adopted. The accuracy of system can reach <TEX>$\lambda$</TEX>/40(<TEX>$\lambda$</TEX>=10.6<TEX>${\mu}m$</TEX>)
904
- SONG GUO-XUAN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.165-166
- 1996
- 원문 바로보기
A bottom-up model for the formation of GMCs is described, where the observed GMCs are the aggregates of less massive clouds. The aggregates are getting more and more massive in the process of consecutive collision between clouds.
905
- HESSER J. E.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.111-118
- 1996
- 원문 바로보기
We review observational evidence bearing on the formation of a prototypical large spiral galaxy, the Milky Way. New ground- and space-based studies of globular star clusters and dwarf spheroidal galaxies provide a wealth of information to constrain theories of galaxy formation. It appears likely that the Milky Way formed by an combination of rapid, dissipative collapse and mergers, but the relative contributions of these two mechanisms remain controversial. New evidence, however, indicates that initial star and star cluster formation occurred simultaneously over a volume that presently extends to twice the distance of the Magellanic Clouds.
906
- LEE GEUNHO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.103-104
- 1996
- 원문 바로보기
907
- MINN Y. K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.189-191
- 1996
- 원문 바로보기
We have made observations of the dark cloud, B5 in the transitions of <TEX>$H_2CO$</TEX>, J = <TEX>$1_{10} {\leftarrow} 1_{11}$</TEX>, and <TEX>$2_{12} {\to} 1_{11}$</TEX>. We compared the <TEX>$H_2CO$</TEX> result with the observational results of CO and with the visual extinction. There exists an overall correspondence of molecules and extinction. However, a detailed agreement is lacking. We discussed the kinematics and the spatial relationship of molecules and extinction in this cloud.
908
- CHOE G. S.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.303-305
- 1996
- 원문 바로보기
The evolution of solar magnetic arcades is investigated with the use of MHD simulations imposing resistivity on sheared magnetic fields. It is found that there is a critical amount of shear, over which magnetic reconnection can take place ill an arcade-like field geometry to create a magnetic island. The process leading to reconnect ion cannot. be solely attributed to a tearing instability, but rather to a reactive evolution of the magnetic arcade under resistivity. The natures of the arcade reconnection are governed by the spatial pattern of resistivity. A fast reconnection with a small shock angle can only be achieved when the diffusion region is localized. In this case. a highly collimated reconnect ion outflow can tear the plasmoid into a pair, and most of principal features in solar eruptive processes are reproduced.
909
- KIM YONG HA
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.245-253
- 1996
- 원문 바로보기
We have analyzed infrared (IR) images of Jupiter which was observed at the McDonald Observatory, Texas, U.S.A., during the P/SHoemaker-LEvy 9 (SL9) impact period and about one week after the last impact. The IR images were obtained on the 2.7m telescope using a NICMOS array with filters to isolate the <TEX>$1.5{\mu}m\;NH_3\; band,\;the\;2.3{\mu}m\;CH_4\;band,\;the\;2.12{\mu}m\;H_2\;S(0)$</TEX> pressure-induced absorption, and the continua at <TEX>$1.58{\mu}m\;and\;2.0{\mu}m$</TEX> (short K-band). All images except those with the <TEX>$1.58{\mu}m$</TEX> continuum filter show bright impact sites against the relatively dark Jovian disk near the impact latitude of about <TEX>$45^{\circ}$</TEX> S. This implies that dusts originated from the impacts reflect the solar radiation at high altitudes before absorbed by stratospheric <TEX>$CH_4,\;NH_3 \;or\;H_2$</TEX>. The impact sites observed with the <TEX>$2.3{\mu}m$</TEX> filter are conspicuously bright against a very dark background. The morphology of impact sites, G, L, and H at 2.3 and <TEX>$2.12{\mu}m$</TEX> filters shows clearly an asymmetric structure toward the incident direction of the comet fragments, in agreement with the studies of visible impact images obtained with the Hubble Space Telescope. Comparisons of reflectances of G, L, and H sites with simple radiative transfer models suggest that optically thick dust layers were formed at high altitudes at which methane absorption attenuates incoming sunlight only by about <TEX>$1\%$</TEX>. The dust layers in these sites seem to form at about the same altitude regardless of the magnitude of the impacts, but they appear to descend gradually after the impacts. The dust layers have optical depths of 2-5, according to the models.
910
- CHOI MINHO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.195-196
- 1996
- 원문 바로보기
We observed CO J = 2 <TEX>$\to$</TEX> 1 and J = 3 <TEX>$\to$</TEX> 2 lines toward several star formation regions with extremely high velocity (EHV) outflows: W3 IRS5, W28 A2, GL2591, S140, and Cepheus A. The full width of the wings are 90-235 km <TEX>$s^{-1}$</TEX>. Some wings show clear break of slope in the line profile implying that the nature of the EHV outflow is different from that of the high velocity outflow. We suggest that the EHV CO wing emission is tracing CO molecules in the stellar wind or jet which drives the high velocity outflow.