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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
- 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.
986
- KIM JONGSOO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.167-168
- 1996
- 원문 바로보기
987
- YIM Jo RYEONG
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.241-242
- 1996
- 원문 바로보기
The UBV observations of the close binary system CW Cephei were made from August 198:3 to December 1984 during 25 nights using the 61cm Boller and Chivens reflector at the Sobaeksan Astronomy Observatory. The new UBV light curves were analyzed with the recent Wilson-Devinney binary model. Our photometric solution for CW Cep were well consistent with those of Clausen &. Gimenez (1991). Using our photometric solution and Popper & Hill (1991) spectroscopic one, each absolute masses and radii of components for CW Cep were derived as 13.63 M<TEX>$\bigodot$</TEX> and 5.83 R<TEX>$\bigodot$</TEX> for the primary, and 12.18 M<TEX>$\bigodot$</TEX> and 5.14 R<TEX>$\bigodot$</TEX> for the secondary, respectively.
988
- ISOBE SYUZO
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.451-453
- 1996
- 원문 바로보기
There is a question, 'Which is beautiful, a flower or a star?'. Its answer is different from one person .to another. It is only a matter of what one is interested in. It is very difficult for most school pupils, who will have non-scientific jobs, to understand science courses taught currently in school, because each science (physics, chemistry, biology, and earth science) is independently taught from the other sciences. Therefore, their knowledge of sciences obtained during their school period does not significantly help their understanding of global environmental problems. I am proposing that several scientific stories should be prepared to connect all the related scientific phenomena in order to give those pupils ideas in understanding global environmental problems. I believe that astronomy is able to play an important role in this context.
989
- NHA SARAH
- Journal of the Korean astronomical society = 천문학회지
- 29, n.suppl1
- pp.243-243
- 1996
- 원문 바로보기
UBV observations have been made jointly at three observatories for the recent eclipse of the long period atmospheric eclipsing binary star Zeta Aur in 1995-6. Observations covered successfully the phases before, during, and after the eclipse enable us to determine the accurate time of mid-eclipse and the duration of the totality. The hypothesis of the expansion of the K supergiant has been tested and the positive conclusion may be derived.
990
- 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.