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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 85/122
841
- 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.
842
- LIN GUAN-QING
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.401-402
- 1996
- 원문 바로보기
843
- Hul F. X.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.53-54
- 1996
- 원문 바로보기
Based on the database of 128 disk galaxies (66 SO, 62 S and Irr) mailnly compiled from Kent and Gunn (1982) and Doi et a1.(1995) which is complete down to m < 15.6 mag within a radius of <TEX>$3^{\circ}$</TEX>, the orientation of spin vectors of disk galaxies of the Coma cluster has been analyzed. The results confirm the morphological dependence of the orientation of disk galaxies found from the analsis of the Virgo cluster. Common features of orientation of disk galaxies of both clusters are outlined.
844
- HEILES CARL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.151-154
- 1996
- 원문 바로보기
We examine the observations of large-scale magnetic fields in the Universe. We begin at the largest scale with clusters of galaxies and work our way down through galaxies and finally to the Milky Way. on which we concentrate in detail. We examine the observations of the Galactic magnetic field, and their interpretation, under the philosophy that the Galactic magnetic field is like that in other spiral galaxies. We use pulsar data. diffuse Galactic synchrotron emission, and starlight polarization data to discuss the Galaxy's global magnetic configuration and the uniform (<TEX>$B_u$</TEX>), random (<TEX>$B_r$</TEX>), and total (<TEX>$B_t$</TEX>) components of the field strength. We find disagreement among conclusions derived from the various data sets and argue that the pulsar data are not the best indicator for large-scale Galactic field. Near the Solar circle, we find that the azimuthal average of <TEX>$B_t$</TEX> is 4.2<TEX>$\mu$</TEX>G and we adopt <TEX>$B_u\~$</TEX>2.2 and <TEX>$B_r\~3.6{\mu}G$</TEX>. <TEX>$B_t$</TEX> is higher in spiral arms, reaching <TEX>$\~5.9{\mu}G$</TEX>. <TEX>$B_t$</TEX> is higher for smaller <TEX>$R_{Gal}$</TEX>, reaching <TEX>$\~8.0{\mu}G$</TEX> for <TEX>$R_{Gal}$</TEX> = 4.0 kpc. The pattern of field lines is not concentric circles but spirals. The inclination of the magnetic spiral may be smaller than that of the Galaxy's spiral arms if our sample, which refers primarily to the interarm region near the Sun, is representative. However, it is not inconceivable that the local field lines follow the Galaxy's spiral pattern, as is observed in external galaxies.
845
- 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.
846
- ZHOU HONGNAN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.363-364
- 1996
- 원문 바로보기
847
- 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.
848
- BYUN YONG-IK
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.125-126
- 1996
- 원문 바로보기
Beijing-Arizona-Taipei-Connecticut (BATC) survey is a long term project to map the spectral energy distribution of various objects using 15 intermediate band filters and aims to cover about 450 sq degrees of northern sky. The SED information, combined with image structure information, is used to classify objects into several stellar and galaxy categories as well as QSO candidates. In this paper, we present a preliminary setup of robust data reduction procedure recently developed at NCU and also briefly discuss general classification scheme: redshift estimate, and automatic detection of variable objects.
849
- KHOSROSHAHI H. G.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.277-278
- 1996
- 원문 바로보기
In attempts to detect gravitational waves, the response of some celestial systems such as the earth[l] or binary systems[2] to such waves have been investigated. Following this line of thought, here we study the possibility of excitation of the oscillation modes of a polytropic star by gravitational radiation and calculate the relevant absorption cross sections.
850
- 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.