Y. B. Kang

Korea Astronomy and Space Science Institute

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Jae‐Rim Koo

Gongju National University of Education

Soo‐Chang Rey

Chungnam National University

Chung‐Uk Lee

Korea Astronomy and Space Science Institute

D. E. Mkrtichian

National Astronomical Research Institute of Thailand

Yong Ha Kim

Chungnam National University

David A. Thilker

Johns Hopkins University

L. Bianchi

Johns Hopkins University

P. W. Hodge

University of Washington

Y. B. Jeon

Korea Astronomy and Space Science Institute

Knut Olsen

NSF’s NOIRLab

Cooperative Institutions

Korea Astronomy and Space Science Institute

Aarhus University

University of Sydney

Konkoly Observatory

Korea Atomic Energy Research Institute

Chungnam National University

Korea University of Science and Technology

Osservatorio Astrofisico di Catania

Johns Hopkins University

Centre National de la Recherche Scientifique

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Young stellar populations in the local group: an HST and GALEX comprehensive study

Astrophysics and Space Science (2011)

L. Bianchi Y. B. Kang Boryana Efremova David A. Thilker P. W. Hodge

Local Group

Extinction (optical mineralogy)

10.1007/s10509-011-0697-7

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Citations (13)

Study on the Vibrational Scraping of Uranium Product from a Solid Cathode of Electrorefiner

Journal of the Nuclear Fuel Cycle and Waste Technology(JNFCWT) (2015)

Sung-Bin Park Y. B. Kang Sung Chan Hwang Han Soo Lee Seungwoo Paek

A high-throughput electrorefiner has been developed for commercialization use by enhancing the uranium recovery from the reduced metal which is produced from the oxide reduction process. It is necessary to scrap and effectively collect uranium dendrites from the surface of the solid cathode for high yield. When a steel electrode is used as the cathode in the electrorefining process, uranium is deposited and regularly stuck to the steel cathode during electrorefining. The sticking coefficient of a steel cathode is very high. In order to decrease the sticking coefficient of the steel cathode effectively, vibration mode was applied to the electrode in this study. Uranium dendrites were scraped and fell apart from the steel cathode by a vibration force. The vibrational scraping of the steel cathode was compared to the self-scraping of the graphite cathode. Effects of the applied current density and the vibration stroke on the scraping of the uranium dendrites were also investigated.

10.7733/jnfcwt.2015.13.4.315

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RACE-OC project: rotation and variability in the open cluster NGC 2099 (M 37)

Astronomy and Astrophysics (2008)

S. Messina E. Distefano Padmakar Parihar Y. B. Kang S.-L. Kim

Context. Rotation and solar-type magnetic activity are closely related to each other in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on star's rotation, and rotation itself is strongly influenced by strength and topology of the magnetic fields. Open clusters represent especially useful targets to investigate the connection between rotation and activity.

Rotation period

Star (game theory)

10.1051/0004-6361:20079216

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Citations (18)

Multi-site time series photometry of the open cluster M67

Dennis Stello T. Arentoft T. R. Bedding Makram Bouzid H. Bruntt

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VizieR Online Data Catalog: BV photometry of NGC 2099 variables (Messina+, 2008)

yCat (2008)

S. Messina D. Distefano P. Padmakar Y. B. Kang S. L. Kim

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Variable Stars in the Open Cluster NGC 2099 (M37)

Publications of the Astronomical Society of the Pacific (2007)

Y. B. Kang S.‐L. Kim Soo‐Chang Rey Chung‐Uk Lee Yong Ha Kim

Time-series CCD photometric observations of the intermediate-age open cluster NGC 2099 were performed to search for variable stars. We also carried out BV photometry to study physical properties of variables in the cluster. Using V-band time-series data, we carefully examined light variations of about 12,000 stars in the range of 10 < V < 22 mag. A total of 24 variable stars have been identified; seven stars are previously known variables and 17 stars are newly identified. On the basis of observational properties such as light curve shape, period, and amplitude, we classified the new variable stars as nine delta Scuti-type pulsating stars, seven eclipsing binaries, and one peculiar variable star. Judging from the position of delta Scuti-type stars in the color-magnitude diagram, only two stars are likely to have the cluster membership. One new variable KV10 shows peculiar light variations with a delta Scuti-type short period of about 0.044 day as well as a long period of 0.417 day.

Variable star

Blue straggler

10.1086/513883

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Citations (20)

“Variable Stars in the Open Cluster NGC 2099 (M37)” (PASP, 119, 239, [2007])

Publications of the Astronomical Society of the Pacific (2008)

Y. B. Kang S. L. Kim Soo‐Chang Rey Chung‐Uk Lee Yong Ha Kim

10.1086/529023

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Citations (3)

VizieR Online Data Catalog: BV photometry of M11 stars (Koo+, 2007)

yCat (2009)

Jae‐Rim Koo S. L. Kim Soo‐Chang Rey C. U. Lee Y. H. Kim

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Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Herculis

Astronomy and Astrophysics (2011)

P. Lampens A. Strigachev S.-L. Kim E. Rodrı́guez M. J. López‐González

We present the results of a multi-site photometric campaign carried out in 2004–2008 for the Algol-type eclipsing binary system CT Her, the primary component of which displays δ Scuti-type oscillations. Our data consist of differential light curves collected in the filters B and V, which were analysed using the method of Wilson-Devinney (Phoebe). After identifying an adequate binary model and removing the best-fit light-curve solution, we performed a Fourier analysis of the residual B and V light curves to investigate the pulsational behaviour. We confirm the presence of rapid pulsations with a main period of 27.2 min. Up to eight significant frequencies with semi-amplitudes in the range 3 to 1 mmag were detected, all of which lie in the frequency range 43.5–53.5 d-1. This result is independent of the choice of the primary’s effective temperature (8200 or 8700 K) since the light-curve models of the binary are very similar in both cases. This is yet another case of a complex frequency spectrum observed for an accreting δ Scuti-type star (after Y Cam). In addition, we demonstrate that the amplitudes of several pulsation frequencies provide evidence of variability on timescales as short as 1–2 years, perhaps even less. Moreover, our analysis takes into account some recently acquired spectra, from which we obtained the corresponding radial velocities for the years 2007–2009. Investigation of the O–C diagram shows that further monitoring of the epochs of eclipse minima of CT Her will cast new light on the evolution of its orbital period.

Eclipse

Effective temperature

10.1051/0004-6361/201117021

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Citations (11)

The Development of U-recovery by Continuous Electrorefining

Jeong-Guk Kim Sung-Bin Park Sung‐Chan Hwang Y. B. Kang Sung-Jai Lee

The electrorefining process, one of main processes which are composed of pyroprocess to recover the useful elements from spent fuel, and the domestic development of electrorefiner have been reviewed. The electrorefiner is composed of an anode basket containing reduced spent fuel such as uranium, transuranic and rare earth elements, and a solid cathode, which are in LiCl-KCl eutectic electrolyte. Oxidation (dissolution) reaction occurs on the anode and a pure uranium is electrochemically reduced (deposited) on the solid cathode. By application of graphite cathode, which has a self-scrapping characteristics for the uranium deposits, and a recovery of the fallen deposits by a screw conveyer, a high-throughput continuous electrorefiner with a capacity of 20 kgU/day has been developed.

Electrowinning

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Citations (1)