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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 87/119
861
- LEE SANG WOO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.1
- pp.9-18
- 1996
- 원문 바로보기
We have analyzed vector magnetograms and <TEX>$H\beta$</TEX> filtergrams of two sunspot groups, one in a growing phase and the other in a decaying phase. In this study, the temporal evolution of their magnetic morphology has been investigated in association with solar activity. The morphological variations of the growing and decaying phase of these sunspots revealed in detail the coalescence of small spots into a large spot and the fragmentation of a large spot into many small spots, respectively. Numerous small flares were detected in the spot group during the decaying phase. This seems to be intimately associated with the shearing motions of many spots with different polarities created by fragmentation of a large sunspot. The magnetic flux and the average shear angle are found to be substantially reduced during the decaying phase, especially in the course of the flarings. This implies that the decaying phase of the sunspot is, to some degree, involved with magnetic field cancellation. The growing spot group has not shown any large activities, but numerous small spots have grown into a typical bipolar sunspot.
862
- KRAICHEVA ZDRAVKA
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.227-228
- 1996
- 원문 바로보기
The long-term light curves of the novalikes TT Ari, KR Aur, AM Her and MV Lyr, were compiled and analysed for solar-like cyclical behaviour. The frequency analysis showed long-term cyclical modulations of the brightness of the stars, which can be ascribed to changes of the radii of the late type secondaries in order of <TEX>${\Delta}R/R{\simeq} 10^{-4}-10^{-5}$</TEX>.
863
- TOMITA AKIHIKO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.71-72
- 1996
- 원문 바로보기
We show that the star formation activity of spiral galaxies has a great variety. The star formation variation in a time scale of <TEX>$10^8$</TEX> yr and the mechanism responsible for the variation are discussed.
864
- ISOBE SYUZO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.365-366
- 1996
- 원문 바로보기
865
- KIM KEE- TAE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.177-178
- 1996
- 원문 바로보기
866
- YUN MIN S.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.159-160
- 1996
- 원문 바로보기
Recent high resolution CO observations of normal and starburst galaxies at Owens Valley Millimeter Array are summarized. While normal disk galaxies generally show exponential distribution which follows the optical blue light, starburst galaxies are often characterized by a compact (<TEX>$\~$</TEX>1 kpc) nuclear complex whose surface gas mass density is strongly correlated with the observed large infrared luminosity and thus the ongoing massive star formation.
867
- HUNSTEAD RICHARD W.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.35-38
- 1996
- 원문 바로보기
Much of our knowledge about the formation and evolution of high-redshift galaxies has come from studying the absorption signatures they impress on the spectra of background QSOs. The damped Lyman <TEX>$\alpha$</TEX> (DLA) systems, in particular, have proved to be valuable probes of the metallicity and dust at redshifts z <TEX>$\~$</TEX>2-3 in what are the likely progenitors of galaxies like our own. At z <TEX>$\~$</TEX> 2 we find that the typical metallicity of the universe was 1/15 solar. In addition, we find clear evidence for the existence of trace amounts of interstellar dust in DLA galaxies and show that this is consistent with recent high resolution spectra of DLAs with the Keck telescope, despite claims to the contrary.
868
- KIM SUNGEUN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.95-95
- 1996
- 원문 바로보기
We present the recent results of an HI aperture synthesis mosaic of the Large Magellanic Cloud(LMC), made by combining data from 1344 separate pointing centers using the Australia Telescope Compact Array(ATCA). The resolution of the mosaiced images is 1'.0 (15 pc, using a distance to the LMC of 50 kpc). In contrast with its appearance at other wavelengths, the LMC is remarkably symmetric in HI on the largest scales, with the bulk of the HI residing in a disk of diameter 7.3 kpc. Outer spiral structure is clearly seen, though the features appear due to differential rotation, therefore transient in nature. A good correlation is seen between the supershells previously identified in Halpha (e.g. Meaburn 1980) and HI structures.
869
- LEE HYUN-CHUL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.133-134
- 1996
- 원문 바로보기
We present the systematic variations of H<TEX>$\beta$</TEX> index of simple stellar populations due to horizontal-branch (HB) stars. Most of the previous works have been done without careful considerations of HB stars. Since the Balmer line strengths are very sensitive to the temperature, including the HB stars are quite important. We found that the strength of H,6 index is strongly affected by HB stars, and hence the age estimation without careful consideration of the variation of HB morphology with metallicity and age would underestimate the ages of ellipticals.
870
- KIM YONGGI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.247-248
- 1996
- 원문 바로보기
In order to study the X-ray radiations from solar type strong interacting binary stars, we have collected X-ray data of 44i Bootis (P=0.2678 days, SP=G2+G2) from the EXOSAT data archive. Preliminarly analysis of a part of these data has been already reported by Vilhu & Heise (1986). In this paper, however, we present a more complete light curve in LE region than the previous work, and some unpublished X-ray light curves and spectrums. Using these new materials a new attempt to find the physical explanation about. some observational characteristic figures in the X-ray light curves and spectrums has been made.