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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 86/122
851
- OHTANI H.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.405-406
- 1996
- 원문 바로보기
852
- KURTANIDZE OMAR M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.61-62
- 1996
- 원문 바로보기
The photometry is reported for galaxies in two clusters A1983, 2065 with redshifts 0.046, 0.072 respectively. The luminosity segregation is observed only within a magnitude from the brightest galaxy. The alignment of the galaxy major axis is observed in the Corona Borealis cluster. The intermediate distance clusters (0.05 < z < 0.15) will be studied by CCD mounted on 125cm RCh and 70cm meniscus type telescopes.
853
- GARDINER LANCE T.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.93-94
- 1996
- 원문 바로보기
The Galaxy and the Large and Small Magellanic Clouds (LMC and SMC respectively) form a triple system of mutually interacting galaxies. We have carried out a set of N-body simulations on the gravitational interaction of the SMC with the Galaxy and the LMC in order to model prominent features such as the Magellanic Stream, the inter-Cloud Bridge, and the large depth of the SMC which are thought to be products of the tidal interactions among the members of this system.
854
- TOVMASSIAN H. M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.149-150
- 1996
- 원문 바로보기
The results of observations of a dozen OB stellar associations made with the ultraviolet space telescope Glazar is presented.
855
- WANG JIA LONG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.217-221
- 1996
- 원문 바로보기
We have examined morphological change and movements of individual sunspots within a sunspot group in association with a large solar flare activity (3B/X1.5) appeared on 13 May 1981. For this purpose we measured distance among spots during the period before and after the flare activity and estimated the average velocity of their movement. Our main results are as follows: (1) The longitudinal displacement among sunspots are generally greater than the latitudinal displacement. (2) During the period the spots moved with an average velocity of 1.2 km/s in longitude and 0.86 km/s in latitude. (3) The most notable change took place in the central part placed between the two ribbons of the flare.
856
- MESZAROS A.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.43-43
- 1996
- 원문 바로보기
857
- CHUN MOO-YOUNG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.137-156
- 1996
- 원문 바로보기
NGC 6716 is an intermediate-age open cluster in Sagittarius. In this paper, we present the new UBV CCD photometry of the stars in the cluster, which is deeper than previous ones. From the color-color diagram and the color-magnitude diagram, we derived a reddening <TEX>$E_{B- V} = 0.17\pm0.03$</TEX> and a distance modulus of the cluster, <TEX>$(V - Mv)_o = 9.2\pm0.1$</TEX>. An age of the cluster is estimated as <TEX>$8\pm10^7 yrs$</TEX> from the latest isochrone. Luminosity function and mass function of the cluster are derived. The gradient of the mass function of bright stars is a bit steep, <TEX>$\Gamma = -1.85\pm0.05$</TEX>, and there is no distinct bump and dip in the mass function.
858
- MOON YONG-JAE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.207-215
- 1996
- 원문 바로보기
To derive coronal temperature, electron density and nonthermal velocity, we have analyzed high resolution spectra (e.g., Fe XII 338.3, Fe XII 352.1, Fe XIV 334.2, Fe XIV 353.8, Fe XV 284.2, Fe XV 321.8, Fe XV 327.0, Fe XVI 335.4, and Fe XVI 360.8) taken from AR 6615 by SERTS (Solar Extreme Ultraviolet Rocket Telescope and Spectrograph). Important findings emerging from the present study are as follows: (1) Temperature estimated from Fe XVI 335.4 and Fe XIV, 334.2 is <TEX>$\~2.4\times10^6 K$</TEX> and no systematic difference in temperature is found between the active region and its adjacent quiet region; (2) Mean electron density estimated from Fe XV is <TEX>$\~3\times10^9 cm^{-3}\;and\;\~10^{10} cm^{-3}$</TEX> from Fe XII and Fe XIV; (3) Mean density of the active region is found to be higher than that of the quiet region by a factor of 2; (4) Nonthermal velocity estimated from Fe XV and Fe XVI is <TEX>$20\times25 km\;s^{-l}$</TEX> which decreases with increasing ionization temperatures. This supports the notion that the nonthermal velocity declines outwards above the transition region.
859
- 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.
860
- REY SOO-CHANG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.137-138
- 1996
- 원문 바로보기
The first large-format CCD color-magnitude diagram (CMD) in the B and V passbands is presented for the Galactic globular cluster M53 (NGC 5024). We have discovered 117 new blue straggler (BS) candidates in the field of M53. The analysis of bright BS stars (V <19.0) clearly shows a bimodal radial distribution, with a high frequency in the inner and outer regions. The distribution is similar to that found in M3, a globular cluster with similar central density and concentration.