• The Bulletin of The Korean Astronomical Society
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• v.9
• /
• pp.9.2-9.2
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• 1984

• The Bulletin of The Korean Astronomical Society
• /
• v.19
• /
• pp.9.1-9.1
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• 1994

• The Bulletin of The Korean Astronomical Society
• /
• v.19
• /
• pp.11.2-12
• /
• 1994

• The Bulletin of The Korean Astronomical Society
• /
• v.33 no.2
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• pp.83.1-83.1
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• 2008

• The Bulletin of The Korean Astronomical Society
• /
• v.11
• /
• pp.7.2-8
• /
• 1986

• The Bulletin of The Korean Astronomical Society
• /
• v.11
• /
• pp.8.2-9
• /
• 1986

• Molecules and Cells
• /
• v.46 no.3
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• pp.187-189
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• 2023

• Journal of Astronomy and Space Sciences
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• v.13 no.1
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• pp.1-8
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• 1996

CCD time series photometry was performed for two Oosterhoff type II field RR Lyrae stars, SV Eri and XX And, to construct light curves in B and V bands. The maximum light times from our observations were combined with those in the literature to construct phase shift diagrams, from which we determined the period change rates ${\beta}$. We obtained large positive period change rates for these stars, which are expected from current evolutionary models if these stars are evolving rapidly from blue to red toward the end of core helium burning phase.

• Journal of Astronomy and Space Sciences
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• v.18 no.1
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• pp.55-62
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• 2001

We present VRI CCD photometry of W UMa type binary TY UMa. The light curves show that the secondary minimum is deeper than the primary minimum and the maximum I ($0.^{p}25$)is $0.^{m}023$ brighter than the maximum II ($0.^{p}75$). The V light curve has been analyzed and the photometric solutions have been determined by the method of Wilson & Devinney differential correction. We adopted the spot model to explain the asymetric light curve.

• Journal of The Korean Astronomical Society
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• v.43 no.1
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• pp.1-8
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• 2010

JHK near-infrared photometry of star clusters in the dwarf irregular/dwarf starburst galaxy NGC 1569 are presented. After adopting several criteria to exclude other sources (foreground stars, background galaxies, etc.), 154 candidates of star clusters are identified in the near-infrared images of NGC 1569, which include very young star clusters. Especially, from analysis based on theoretical background, we found ten very young star clusters near the center of NGC 1569. The total reddening values toward these clusters are estimated to be $A_V$=1-9 mag from comparison with the theoretical estimates given by the Leitherer et al. (1999)'s star cluster model.