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- The Korean Astronomical Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-4614 (ISSN : 1225-4614)
1225-4614
- DB구축현황 : 1,227건 (DB Construction : 1,227 Articles)
총 게시글 1,227건
페이지 91/123
901
- STALIN C. S.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.341-342
- 1996
- 원문 바로보기
We present here the solar LOG GF values obtained using the Liege solar at las and the standard solar photospheric models for the spectral lines in the wavelength range <TEX>${\lambda}{\lambda}$</TEX> 6209 - 6273 <TEX>${\AA}$</TEX>. These log gf values shall be used to interpret a high resolution spectra of the star <TEX>$\gamma$</TEX> Draconics.
902
- KIM SEUNG-LEE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.1
- pp.31-41
- 1996
- 원문 바로보기
We present results of time-series CCD photometry for 178 stars in the young open cluster M29 (=NGC6913). Total 1036 V-band CCD frames were collected for five nights between August 12 and September 13, 1994. The photometric precision is about 7.6 mmag for 9th-10th mag stars in M29 with exposure times of 30 seconds. From the dispersion diagram and the light curves, one detached eclipsing binary (HD194378) and two suspected variables are newly discovered. <TEX>$A\;\gamma\;Cas$</TEX> type variable, V1322 Cyg, which has been known as a member of M29, did not show any light variations during the period of present observations, indicating that it passed the steady phase without the eruption during our observing runs.
903
- YUAN Q. R.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.55-56
- 1996
- 원문 바로보기
In order to investigate the spatial orientation of the spin vectors of galaxies in the Virgo cluster, we carried out a detailed identification of all the certain and possible member disk galaxies with four UK Schmidt Telescope (UKST) III a-j direct plates digitized by the Automated Plate Measuring System (APM). As a result, a relatively large and complete database with no selection effect of the member galaxies has been established. We provide the APM measured values of the position angle (P.A.) and diameters at the isophotal level of 24.5 <TEX>$m_j / arcsec^2$</TEX>. Based on this newly generated database, an initial study on the spatial orientation of the spin vectors of galaxies in the Virgo cluster is shown.
904
- CHEN ROSIE CHANG-HUI
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.135-136
- 1996
- 원문 바로보기
We present a new photometric study of the globular cluster NGC288 in Stromgren u, v, b, y, and H<TEX>$\beta$</TEX> system. This cluster is known to have an intermediate metallicity but its color-magnitude diagram has a pure blue horizontal branch, which is a signature of metal poor stellar population. We compare our dataset with Bergbusch's (1993) in both field size and CMD to see whether different photometry system would determine the same physical parameters of a cluster. Demarque and Yi's isochrones (1996, private communication) were applied to Bergbusch's dataset, and we obtained distance modulus of (m - M) = 14.9 <TEX>$\pm$</TEX> 0.2, color excess of E(B - V) = 0.03, and age of 1.5<TEX>$\pm$</TEX>3 Gyr. Vandenberg's (1985) isochrones for Stromgren system were also applied to Bergbusch's and our data. We find that the isochrone fits to different photometric systems give rather in consist ant solutions. The source of this discrepancy may become clear when the Demarque and Yi's isochrones for Johnson system are converted to those of Stromgren system. We note that Kurucz model atmospheres provide a useful ground for this conversion work as well as theoretical study of Stromgren characteristics of globular cluster stars.
905
- SUBRAMANIAN K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.155-158
- 1996
- 원문 바로보기
Magnetic fields correlated on several kiloparsec scales are seen in spiral galaxies. Their origin could be due to the winding up of a primordial cosmological field or due to amplification of a small seed field by a turbulent galactic dynamo. Both options have difficulties: There is no known battery mechanism for producing the required primordial field. Equally the turbulent dynamo may self destruct before being able to produce the large scale field, due to excess generation of small scale power. The current status of these difficulties is discussed. The resolution could depend on the nature of the saturated field produced by the small scale dynamo. We argue that the small scale fields do not fill most of the volume of the fluid and instead concentrate into intermittent ropes, with their peak value of order equipartition fields, and radii much smaller than their lengths. In this case these fields neither drain significant energy from the turbulence nor convert eddy motion of the turbulence on the outer scale to wave like motion. This preserves the diffusive effects needed for the large scale dynamo operation.
906
- ZHANG X.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.199-200
- 1996
- 원문 바로보기
907
- TOVMASSIAN H. M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.393-393
- 1996
- 원문 바로보기
A new concept of a simple and cheap construction of giant telescope is described.
908
- KWON SUK MINN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.197-198
- 1996
- 원문 바로보기
We have carried out <TEX>$^{13}CO$</TEX> J = 1 <TEX>$\to$</TEX> 0 line observations with spatial resolution of 2' toward 17 small globules selected from the catalogue of Clemens & Barvainis (1988) with a selection criterion of [b] <TEX>$\ge$</TEX> 15 degrees using the Nagoya 4-m radio telescope. Overall characteristics and physical parameters are presented and discussed by examining the <TEX>$^{13}CO$</TEX> integrated intensity map for each of the globules.
909
- CHEN ALFRED B.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.123-124
- 1996
- 원문 바로보기
Snapshots of eight SA and standard fields from low to high galactic latitudes were made using the KPNO 0.9m 2K <TEX>$\times$</TEX> 2K CCD with a limiting magnitude from 19 to 22.5. The purpose of this study is to determine the vertical distribution of stars with respect to Galactic latitude and z-distance in comparison with the model simulation between intermediate population to the 'thick disk' component of scale height of a few kpc. Comparison of the preliminary results between observed and model simulation for 3 of the S fields shows good agreement both in V-mag and B- V color distributions. A bimodal distribution in B- V at high galactic latitude seems to be represented by a halo and 'thick disk' dwarf in the blue and by a normal disk dwarf population in the red.
910
- ZHOU HONG NAN
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.443-444
- 1996
- 원문 바로보기
From 146 B.C. to A.D. 1760, 363 sets of cometary observations have been recorded in Chinese Ancient Records of Celestial Phenomena. The positions of all recorded comets, or their paths, on the sky are compared. Taking into account the perturbations of all nine planets and using the numerical method of N-body problem, the orbits of well-recorded comets are calculated. Identification of a periodic comet is presented.