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- 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 84/122
831
- LEE H. W.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.249-250
- 1996
- 원문 바로보기
832
- LEE HYUNG MOK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.195-205
- 1996
- 원문 바로보기
The evolution of the stellar debris after tidal disruption due to the super massive black hole's tidal force is difficult to solve numerically because of the large dynamical range of the problem. We developed an SPH (Smoothed Particle Hydrodynamics) - TVD (Total Variation Diminishing) hybrid code in which the SPH is used to cover a widely spread debris and the TVD is used to compute the stream collision more accurately. While the code in the present form is not sufficient to obtain desired resoultion, it could provide a useful tool in studying the aftermath of the stellar disruption by a massive black hole.
833
- FANG C.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.295-298
- 1996
- 원문 바로보기
Non-LTE calculations, with the non-thermal ionization effects included, indicated that for electron bombardment, the H<TEX>$\alpha$</TEX> line is widely broadened and shows a strong central reversal. Significant enhancements at the line wings of Ly<TEX>$\alpha$</TEX> and Ly<TEX>$\beta$</TEX> are also predicted at the beginning of the impulsive phase of flares. For the proton bombardment, no strong broadening and no large central reversal are expected. However, due to proton-hydrogen charge exchange, the enhancements at the red wings of Ly<TEX>$\alpha$</TEX> and Ly<TEX>$\beta$</TEX> lines at the early impulsive phase of flares are significant. Our results show that the electron beam can also in some cases generate visible and UV continuum emission in white-light flares. However, at the onset phase, a negative flare may appear within several seconds, due to the increase of the H- opacity. Another spectroscopic signature of energetic particles, i.e. the impact polarization of atomic lines, is also mentioned.
834
- PANDEY A. K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.179-180
- 1996
- 원문 바로보기
The aim of the paper is to analyse the extinction law in the giant H II region NGC 3603. The ratio R is found to be greater than 5.0. In front of the cluster the reddening law is found to be normal. We have obtained a distance of <TEX>$\~$</TEX>5.3 Kpc which is significantly smaller than those adopted so far.
835
- ARIMOTO JUN'ICHI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.107-108
- 1996
- 원문 바로보기
VRI bands CCD photometric observations of the BL Lac object OJ 287 have been carried out during the period from October, 1994 to May, 1996. OJ 287 underwent two major outbursts during our observations. The first peak (V14.0 mag.) occurred in the first half of November, 1994 and faded out to 16.5 mag within 150 days. The second peak (14.0 mag.) was observed in late December, 1995. The latter peak continued at nearly the same brightness until May, 1996. Such a long lasting outburst has never been reported for OJ 287. Color indices (V - R and V-I) remained nearly constant during the outbursts.
836
- KOZAI YOSHIHIDE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.279-280
- 1996
- 원문 바로보기
This paper reports on the outline and the status of the TAMA-300 project, the 300 meter laser interferometer gravitational wave detector developed by a team of scientists of several research institutes and universities in Japan. In fact the project has been funded and its construction started at the National Astronomical Observatory, Mitaka, in spring 1995. And the constructions of the tunnels for the east-west and north-south arms and of the central building are completed and a half of pipes for laser beams were brought in. Very stable laser oscillator has been almost completed and mew techniques such as vibration isolations, recycling of laser power, and suspension of mirrors by double pendulums have been developed. In fact the purposes of the project are to establish techniques necessary for future km-class detectors and to operate the detector to catch possible gravitational wave events in nearby galaxies such as Andromeda, the target sensitivity being <TEX>$3 {\times} 10^{-21}$</TEX> at 300Hz.
837
- Qu Z. Q.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.307-308
- 1996
- 원문 바로보기
838
- MOON Y-J.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.323-324
- 1996
- 원문 바로보기
In the present work we introduce a new flare activity indicator, MAD and examine its characteristics by analyzing a set of successive three days' observations of a typical active region, AR2372. The computed MAD is compared with conventional activity indicator such as separator. It is found that. (1) MAD traces very well the separator, (2) it. singles out. local discontinuity of magnetic field lines and (3) it. is a good measure of describing the evolutionary status of active region.
839
- HOJAEV A. S.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.411-412
- 1996
- 원문 바로보기
We present the update information on the International Radio Astronomy Observatory Suffa project and describe the original design of new 70-m radiotelescope RT-70 for millimeter astronomy as well. Some oreographic, seeing and climatic features of Suffa are also given.
840
- LEE SANG-GAK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.171-179
- 1996
- 원문 바로보기
We have obtained the J K images of the central region of the globular cluster M3 (NGC5272), using the <TEX>$256\pm256$</TEX> InSb array. We present JK photometry of bright red giant branch stars in the central <TEX>$2'.2\pm2'.2$</TEX> region of M3. The infrared color-magnitude diagrams are presented. The comparison of the red giant branch of M3 with that of M13 confirms that both globular clusters have similar metal abundances.