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1968년 ~ 2025년까지 1,227 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 : 1,227건 (DB Construction : 1,227 Articles)
총 게시글 1,227건
페이지 94/123
931
- KUBOTA JUN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.329-330
- 1996
- 원문 바로보기
932
- LEE HYUNG MOK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.1
- pp.19-30
- 1996
- 원문 바로보기
We have examined consequences of strong tidal encounters between a neutron star and a normal star using SPH as a possible formation mechanism of isolated recycled pulsars in globular clusters. We have made a number of SPH simulations for close encounters between a main-sequence star of mass ranging from 0.2 to 0.7 <TEX>$M_\bigodot$</TEX> represented by an n=3/2 poly trope and a neutron star represented by a point mass. The outcomes of the first encounters are found to be dependent only on the dimensionless parameter <TEX>$\eta'{\equiv}(m/(m+ M))^{1/2}(\gamma_{min}/R_{MS})^{3/2}(m/M)^{{1/6)}$</TEX>, where m and M are the mass of the main-sequence star and the neutron star, respectively, <TEX>$\gamma_{min}$</TEX> the minimum separation between two stars, and <TEX>$R_{MS}$</TEX> the size of the main-sequence star. The material from the (at least partially) disrupted star forms a disk around the neutron star. If all material in the disk is to be acctreted onto the neutron star's surface, the mass of the disk is enough to spin up the neutron star to spin period of 1 ms.
933
- UMEDA HIDEYUKI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.23-24
- 1996
- 원문 바로보기
We reexamined CDM texture large-scale structure (LSS) formation model. We confirmed that texture model is consistent with 4-year COBE data both in an open and a critical matter density (<TEX>${\Omega}_0$</TEX> = 1) universes, and then obtained normalization for density perturbation power spectrum. We next compare the power spectrum with LSS observation data. Contrary to the previous literature, we found that texture model matches with these data in an open universe no better than in an <TEX>${\Omega}_0$</TEX> = 1 universe. We also found that the model is more likely to fit these data in a cosmological constant dominated (<TEX>$\Lambda-$</TEX>) universe.
934
- CHITRE S. M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.31-33
- 1996
- 원문 바로보기
The role of gravitational lenses as valuable tools for astrophysics and cosmology is highlighted.
935
- PENG QIUHE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.69-70
- 1996
- 원문 바로보기
936
- ANN HONG-BAE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.255-268
- 1996
- 원문 바로보기
We present VR CCD photometry and long-slit spectroscopy of a late type spiral galaxy NGC 7678. The grey scale images and isophotal maps illustrate the presence of a weak bar from which spiral arms emerge. There are many HII regions along the spiral arms, but bright giant HII regions are more concentrated in the massive southern arm. The bright compact nucleus of NGC 7678 is bluer than bulge and bar. The spectral features of the nucleus and HII regoins are very similar but the nuclear spectra shows higher <TEX>$[NII]{\lambda}6583/H_\alpha$</TEX> than those of the HII regions. The nucleus of NGC 7678 seems to be intermediate type between HII region nulcei and LINERs by the ratio of <TEX>$[NII]{\lambda}6583/H_\alpha$</TEX>, but it is more likely to be HII region-like nucleus if we consider the <TEX>$[NII]{\lambda}6716,6731/H_\alpha$</TEX> together. The star formation rate is estimated to be about <TEX>$0.2 M_\bigodot\;yr^{-1}$</TEX> based on the <TEX>$H_\alpha$</TEX> flux.
937
- 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.
938
- YANG SUNG-CHUL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.141-142
- 1996
- 원문 바로보기
939
- TSIOPA O. A.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.215-216
- 1996
- 원문 바로보기
The wind-formed features observed in the early SNe spectra type II and Ia give an evidence of the existence of an ellipsoidal shell formed by the stellar wind prior to the explosion. Such non-spherical shell can occur not only at scales of parsec (the case of SN 1987 A progenitor), but at the scales of 1000 times less. Such shells can be the result of the radial pulsation. The prolate multi-shell structures are interpreted as a result of a pulsation processes with recurrent wind ejections with velocity increasing.
940
- YANAGISAWA KENSHl
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.75-76
- 1996
- 원문 바로보기
We have started multi-color imaging program of nearby galaxies since last year and present preliminary result here. We selected 12 nearby galaxies classfied from E to Sab type and observed in BVRIJHK' bands. Photomtric parameters such as isophotal diameter, axial ratio, isophotal magnitude were measured and observed colors were compared with theoritical model. We find a standard evolution model agrees well with observed results.