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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 94/122
931
- 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.
932
- OHTANI H.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.405-406
- 1996
- 원문 바로보기
933
- 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.
934
- 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.
935
- HANDA T.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.395-396
- 1996
- 원문 바로보기
We developed a telescope control system called ASTROS for the VST1 and VST2, which are specially designed radio telescopes to make a survey and have a 60-cm main dish. ASTROS is designed on the distributed intelligence concept and structurized programming. The hardware of the system is composed of several intelligent devices connected with de facto standard interfaces and main control unit is PC. The program is coded in the C language and its structure is object oriented in order to make easy to replace the component devices. ASTROS is now running on two twin telescopes, VST1 and VST2. VST1 is installed at Nobeyama in Japan and VST2 is installed at La Silla in Chile. They are making a galactic plane survey in CO (J=2-1) with 9 arcmin beam semi-automatically.
936
- 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.
937
- 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.
938
- KOO BON-CHUL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.183-186
- 1996
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We report the results of H I 21-cm and molecular line studies of the shocked interstellar gas in the W51 complex. We present convincing evidences suggesting that the shocked gas has been produced by the interaction of the W51C supernova remant (SNR) with a large molecular cloud, Our results show that W51C is the second SNR with direct evidences for the shocked cloud material.
939
- LEE Y.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.173-174
- 1996
- 원문 바로보기
We have mapped <TEX>$17 deg^2$</TEX> region toward Galactic anticenter in <TEX>$^{12}CO$</TEX> J = 1 - 0 using the 3 mm SIS receiver on the 14 m telescope at Taeduk Radio Astronomy Observatory (TRAO). The region mapped in this paper is the first target of the Galactic AntiCenter CO Survey Project (GACCOS) and was selected comparing with IRAS Sky Survey Atlas (ISSA) images at 100<TEX>${\mu}m$</TEX>. Molecular emission of the target area is found to be very extended and is well matching with the FIR emission boundary. There are several pieces of clouds, and as some of spectra show several peaks, there seem to be several clouds overlapped in some directions. The Velocity of Local Standard of Rest (<TEX>$V_{LSR}$</TEX>) of the CO emission of the mapped region ranges from -20 to +10 km/s. It is also found that the two cloudlets located around I = <TEX>$180^{\circ}$</TEX> have <TEX>$V_{LSR}$</TEX> = -20 km/s, which is very abnormal. The peak antenna temperature of 13 K arises near the H II Region S241.
940
- KUBOTA JUN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.329-330
- 1996
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