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- 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 91/119
901
- ZHOU HONGNAN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.363-364
- 1996
- 원문 바로보기
902
- 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.
903
- CHO SE-HYUNG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.261-262
- 1996
- 원문 바로보기
Nearly simultaneous observations for <TEX>$^{28}SiO$</TEX> v=0, 1, 2, J =3-2 transitions in 39 late-type stars have been carried out in February 1995 and 1996 with the 14 m radio telescope at Taeduk Radio Astronomy Observatory (TRAO). Observations for <TEX>$^{28}SiO$</TEX> v=0, 1, 2, J=2-1 lines in the same objects have been also carried out in March 1995 and March-April 1996. The detection rate of <TEX>$^{28}SiO$</TEX> v=l, J=3-2 line for the <TEX>$^{28}SiO$</TEX> v=l, J=2-1 sources was <TEX>$59\%$</TEX>. Seventeen new detections in the <TEX>$^{28}SiO$</TEX> v=l, J=3-2 transition and 4 new detections in the <TEX>$^{28}SiO$</TEX> v=2, J=3-2 transition have been reported including the intensity ratios within the vibrational ladders and rotational states.
904
- 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.
905
- 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.
906
- 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.
907
- RAN YANBEN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.439-440
- 1996
- 원문 바로보기
The Chinese ancient accounts of timing observations of 48 lunar eclipses and the secular variation of the Earth's spin speed are discussed. A series of <TEX>${\Delta}$</TEX>T expressing the secular deceleration of the Earth's rotation was obtained. The average increase rate of length of the day is about 1.5 milliseconds per century.
908
- OHTANI H.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.405-406
- 1996
- 원문 바로보기
909
- LEE YOUNGUNG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.2
- pp.107-117
- 1996
- 원문 바로보기
We have studied the star forming activities and dust properties of Lynds 1251, a dark cloud located at relatively high galactic latitude. Eleven IRAS point sources identified toward Lynds 1251 are discussed. Estimate of stellar masses, and far-infrared lumnosities of the young stars associated with two prominent IRAS point sources imply that these are T-Tauri stars with masses smaller than <TEX>$0.3 M_\bigodot$</TEX>. The low dust temperature of 27 K and low ratio of FIR emission to hydrogen column density are probably due to the lack of internal heating sources. Presumably two low mass young stars do not have enough energy to heat up the dust and gas associated. The dust heating is dominated by the interstellar heating source, and the weaker interstellar radiation field can explain the exceptionally low dust temperatures found in Lynds 1251. The estimated dust mass of Lynds 1251 is just <TEX>$\~1M_\bigodot$</TEX>, or about 1/1000 of gas mass, which implies that there must be a substantial amount of colder dust. The infrared flux at <TEX>$100{\mu}m$</TEX> is matching well with <TEX>$^{13}CO$</TEX> peak temperature, while the <TEX>$^{12}CO$</TEX> integrated intensity is matching with the boundary of dust emission. Overall, the dust properties of Lynds 1251 is similar to those of normal dark clouds even though it does have star forming activities.
910
- XIE R. X.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.331-332
- 1996
- 원문 바로보기
We present 3 rare subtypes of the FFSs observed with high temporal resolution at 4-frequency (1.42, 2.13, 2.84 and 4.2G GHz). The various FFSs occurred during the main and post-flare phase can demonstrate that coronal nonthermal electron acceleration/injection may go through the whole development process of flares, and deduce that there may exist the re-forming of loop-like structures in the post-flare phase, and the complex multi-type magnetic structures in corona.