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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 99/123
981
- VERMA V. K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.391-392
- 1996
- 원문 바로보기
We have developed and tested a CCD camera (100 <TEX>$\times$</TEX> 100 pixels) system for observing Ha images of the solar flares with time resolution> 25 msec. The 512 <TEX>$\times$</TEX> 512 pixels image of CCD camera at 2 Mpixels/sec can be recorded at the rate of more than 5 frame/sec while 100 <TEX>$\times$</TEX> 100 pixels area image can be obtained 40 frames/sec. The 100 <TEX>$\times$</TEX> 100 pixels image of CCD camera corresponds to 130 <TEX>$\times$</TEX> 130 arc - <TEX>$sec^2$</TEX> of the solar disk.
982
- KIM SEUNG-LEE
- Journal of the Korean astronomical society = 천문학회지
- 29, n.1
- pp.43-51
- 1996
- 원문 바로보기
We present test results of time-series CCD photometry to investigate the photometric precision of the BOAO (Bohyunsan Optical Astronomy Observatory) 1.8m telescope. A well-known field of the old open cluster M67, which includes two pulsating blue stragglers and two W UMa type binaries, was monitored for 3.5 hours on February 22, 1996. We have collected 148 V frames and 3 B frames. Photometric noises which consist mainly of photon noise and scintillation noise, were lowered down to about 1.9 mmag for stars of <TEX>$10.\;^m5$</TEX> in M67 with exposure time of 20 seconds. From the C-M diagram for M67, a number of observational properties were derived; E(B-V) = 0.03, (V-Mv)o = 9.6, Age = 4 Gyr. We obtained light curves for four known variable stars and confirmed their variational characteristics. The pulsating blue stragglers show a low amplitude (about 0.01 mag) of light variation.
983
- AGRAWAL P. C.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.219-221
- 1996
- 원문 바로보기
The x-ray pulsar GX 1+4 was observed by us in four balloon- borne experiments carried out from Hyderabad, India during 1991-1995 period with a hard x-ray telescope. The x-ray telescope consists of two collimated large area xenon-filled proportional counters with an effective area of <TEX>$2400 cm^2$</TEX>, a field of view of <TEX>$5^{\circ}{\times}5^{\circ}$</TEX> and sensitive in the energy band of 20 - 100 keV. The pulsar was detected in bright state in two of the four experiments and x-ray pulsations with 120 second period were detected clearly. Pulsation period, rate of change of period with time, pulse fraction, pulse profile and energy spectra of the source were determined from these studies. During March 1995 observation, the x-ray pulse of GX 1+4 was found to be double-peaked compared to a single-peak pulse profile detected in December 1993. Details of these results are presented and their interpretation discussed in terms of the current accretion models of x-ray binaries.
984
- POGODIN MIKHAIL
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.259-259
- 1996
- 원문 바로보기
Circumstellar peculiarities of the young Herbig Ae/Be stars are analyzed using high-resolution CCD spectroscopic data, obtained in 1991-1996 at the ESO and the Crimean Astrophysical Observatory (about 450 spectrograms). The results of investigation of the rapid line variability in H<TEX>$\alpha$</TEX>, H<TEX>$\beta$</TEX>, HeI 5876 and DNaI lines are presented for AB Am, HD 163296, HD 36112, HD 100546, and HD 50138. We conclude that the behaviour of these lines can be explained in the framework of the model containing an equatorially concentrated and azimuthally inhomogeneous stellar wind, and an external cool shell that occasionally looses matter in form of infall onto the star.
985
- MOULD JEREMY
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.7-10
- 1996
- 원문 바로보기
With an interim calibration based upon half the Key Project's galaxies, the Tully-Fisher relation, the (Dn, <TEX>$\sigma$</TEX>) relation and type II supernovae yield <TEX>$H_0$</TEX>= 73<TEX>$\pm$</TEX>10 km/sec/Mpc.
986
- CHAKRABARTI SANDIP K.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.223-225
- 1996
- 원문 바로보기
We review current theoretical understanding of the spectral properties (low and high states, transition of states, quasi-periodic oscillations etc.) of the low mass as well as supermassive black hole candidates.
987
- GRIGORYEV V. M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.233-234
- 1996
- 원문 바로보기
For obtaining estimates of a total magnetic flux, we propose to use measurements of <TEX>${\partial}I/{\partial}{\lambda}$</TEX>. obtained by a modulation method which is formally identical to Stokes V-parameter measurements. In this case the polarization is not analyzed. It is advisable to use in measurements two parts of the spectral line wing.
988
- LI BI-QIANG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.299-301
- 1996
- 원문 바로보기
It. has been discovered that. active regions commonly have numerous flare-like transient. loop brightenings. We use a magnetic reconnection theory driven by a ponderamotive force on account. of the basic properties of a transient. brightening: lifetime a few mins, total energy <TEX>$10^{25}\~10^{29}$</TEX> erg. The numerical results are consistent with the observations.
989
- MA YUE-HuA
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.309-311
- 1996
- 원문 바로보기
It is analysed the discrepancy about the coronal magnetic field between solar optic and solar radio using magnetic fibril concept with filling factor and fractal structure model. The magnetic field of <TEX>$\~$</TEX> 100 G considered in solar optics is mean value in a large scale, and that of <TEX>$\~$</TEX>1000 G in solar should be the value of fine structures inside 'macro' loop.
990
- ZAKIROV M. M.
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.245-246
- 1996
- 원문 바로보기
The extensive close binary research program earring out at High Altitude Maydanak Observatory (Uzbekistan) by means of the UBVR photoelectric photometry on 1.0 m and 0.6 m Zeiss telescopes is described. It includes more than 240 close binary systems (CBS) in 89 different stellar aggregates. Lightcurves of CBS as well as their orbital elements derived by us are presented.