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Browsing by Subject "Astronomy"

Browsing by Subject "Astronomy"

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  • A GOLDEN DECADE OF GAMMA-RAY PULSAR ASTRONOMY 
    Chung-Yue Hui (Korean Astronomical Society, 2018-12)
    To celebrate the tenth anniversary since the launch of {\it Fermi} Gamma-ray Space Telescope, we take a retrospect to a series of breakthroughs {\it Fermi} has contributed to pulsar astronomy in the last decade. Apart from ...
  • A GRADIENT-T SZE 
    MAKOTO HATTORI; NOBUHIRO OKABE (Korean Astronomical Society, 2004-12)
    The inverse Compton scattering of the cosmic microwave background (CMB) radiation with elec-trons in the intracluster medium which has a temperature gradient, was examined by the third-orderperturbation theory of the Compton ...
  • A METHOD FOR DETERMINING MAGNETIC HELICITY OF SOLAR ACTIVE REGIONS FROM SOHO/MDI MAGNETOGRAMS 
    JONGCHUL CHAE; HYEWON JEONG (Korean Astronomical Society, 2005-06)
    Recently a big progress has been made on the measurements of magnetic helicity of solar activeregions based on photospheric magnetograms . In this paper, we present the details of Chae's method ofdetermining the rate of ...
  • A METHOD OF COLOR EXCESS DETERMINATION FOR HIGH AMPLITUDE ∂ SCUTI STARS 
    김철희; J.-H. Choi; MOON BYUNG KWON (Korean Astronomical Society, 2009-12)
    In order to determine color excess in the uvbyβ color system for high amplitude δ Scuti stars, reddening free [m₁], [c₁], and β indices data were obtained from the existing literature for 21 stars. Then, the three ...
  • A Monte Carlo Study of the Diffusion Process of Thomson-Scattered Line Radiation in Phase Space 
    Hyeon Yong Choe; Lee,Hee-won (Korean Astronomical Society, 2023-12)
    We investigate the diffusion process of Thomson-scattered line photons in both real space and frequency space through a Monte Carlo approach. The emission source is assumed to be monochromatic and point-like embedded at ...
  • A MULTI-WAVELENGTH STUDY OF 30 DORADUS COMPLEX IN THE LARGE MAGELLANIC CLOUD 
    SUNGEUN KIM (Korean Astronomical Society, 2005-09)
    We have made a multi-wavelength study of the X-ray bright giant shell complex 30 Doradus in theLarge Magellanic Cloud (LMC). This is the one of the largest HI complexes in the Local Group. TheAustralia Telescope Compact ...
  • A Multi-Wavelength Study on a Gamma-Ray Bright AGN 1308+326 Using KVN at 22 and 43 GHz 
    Li Shan; Sang-Sung Lee; Whee Yeon Cheong (Korean Astronomical Society, 2024-12)
    In this study, we conduct a multi-frequency analysis of the gamma-ray bright blazar 1308+326 from February 2013 to March 2020, using the Korean VLBI Network at 22 and 43 GHz and gamma-ray data from the Fermi Large Area ...
  • A NEAR-INFRARED STUDY OF THE HIGHLY-OBSCURED ACTIVE STAR-FORMING REGION W51B 
    HYOSUN KIM; YASUSHI NAKAJIMA; 성환경; DAE-SIK MOON; Bon-Chul Koo (Korean Astronomical Society, 2007-03)
    We present wide-eldJHKs-band photometric observations of the three compact HI regions G48.90.3, G49.00.3, and G49.20.3 in the active star-forming region W51B. The star clusters inside the threecompact HI regions show the ...
  • A NEW AUTO-GUIDING SYSTEM FOR CQUEAN 
    Nahyun Choi; Won-Kee Park; 이혜인; 지태근; 전이슬; 임명신; Soojong Pak (Korean Astronomical Society, 2015-06)
    We develop a new auto-guiding system for the Camera for QUasars in the EArly uNiverse (CQUEAN). CQUEAN is an optical CCD camera system attached to the 2.1-m Otto-Struve Telescope (OST) at McDonald Observatory, USA. The new ...
  • A NEW CATALOG OF AGB STARS BASED ON INFRARED TWO-COLOR DIAGRAMS 
    KyungWon Suh; 홍진주 (Korean Astronomical Society, 2017-08)
    We present a new catalog of AGB stars based on infrared two-color diagrams (2CDs) and known properties of the pulsations and spectra. We exclude some misclassified objects from previous catalogs. We identify color areas ...
  • A New Catalog of Silicate Carbon Stars 
    Young-Joo Kwon; KyungWon Suh (Korean Astronomical Society, 2014-08)
    A silicate carbon star is a carbon star which shows circumstellar silicate dust features. We collect a sample of 44 silicate carbon stars from the literature and investigate the validity of the classification. For some ...
  • A NEW CHANNEL TO SEARCH FOR EXTRA - SOLAR SYSTEMS WITH MULTIPLE PLANETS VIA GRAVITATIONAL MICROLENSING 
    CHEONGHOHAN; MYEONG-GUPARK (Korean Astronomical Society, 2002-03)
  • A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS 
    이상성; 오충식; Duk-Gyoo Roh; OH SE JIN; 김종수; 염재환; HyoRyoung Kim; 정동규; Do-Young Byun; 정태현; Noriyuki Kawaguchi; KATSUNORI M. SHIBATA; Kiyoaki Wajima (Korean Astronomical Society, 2015-04)
    We report results of the performance evaluation of a new hardware correlator in Korea, the Daejeon correlator, developed by the Korea Astronomy and Space Science Institute (KASI) and the National Astronomical Observatory ...
  • A New Method to Calibrate the Stellar Color/Surface-Brightness Relation 
    Andrew Gould (Korean Astronomical Society, 2014-08)
    I show that the standard microlensing technique to measure the angular radius of a star using color/surface-brightness relations can be inverted, via late-time proper motion measurements, to calibrate these relations. The ...
  • A NEW METHOD TO DETERMINE TEMPERATURE OF CMES USING A CORONAGRAPH FILTER SYSTEM 
    Kyuhyoun Cho; Chae， Jongchul; 임은경; Cho, Kyung-Suk; Su-Chan Bong; Yang Heesu (Korean Astronomical Society, 2016-02)
    The coronagraph is an instrument enables the investigation of faint features in the vicinity of the Sun, particularly coronal mass ejections (CMEs). So far coronagraphic observations have been mainly used to determine the ...
  • A New Pivot Algorithm for Star Identification 
    Nah， Jakyoung; Yi， Yu; Yong Ha Kim (The Korean Space Science Society, 2014-09)
    In this study, a star identification algorithm which utilizes pivot patterns instead of apparent magnitude information wasdeveloped. The new star identification algorithm consists of two steps of recognition process. In ...
  • A NEW REFERENCING METHOD FOR THE ARRAY ON-THE-FLY OBSERVATION 
    EUN JUNG CHUNG; HYORYOUNG KIM; MYUNG-HYUN RHEE (Korean Astronomical Society, 2005-03)
    In this paper, we suggest a new referencing method for the array On-The-Fly(OTF) observations inradio astronomy. To reduce the baseline residual, we have proposed and evaluated a new referencingmethod which uses the source ...
  • A NOVEL PARALLEL METHOD FOR SPECKLE MASKING RECONSTRUCTION USING THE OPENMP 
    Xuebao Li; Yanfang Zheng (Korean Astronomical Society, 2016-08)
    High resolution reconstruction technology is developed to help enhance the spatial resolution of observational images for ground-based solar telescopes, such as speckle masking. Near real-time reconstruction performance ...
  • A NUMERICAL METHOD TO ANALYZE GEOMETRIC FACTORS OF A SPACE PARTICLE DETECTOR RELATIVE TO OMNIDIRECTIONAL PROTON AND ELECTRON FLUXES 
    Sungmin Pak; 신유철; Joo Woo; JONGHO SEON (Korean Astronomical Society, 2018-08)
    A numerical method is proposed to calculate the response of detectors measuring particle energies from incident isotropic fluxes of electrons and positive ions. The isotropic flux is generated by injecting particles moving ...
  • A PHOTOMETRIC STUDY OF FIVE OPEN CLUSTERS IN THE SDSS 
    류진혁; 이명균 (Korean Astronomical Society, 2011-10)
    We present a photometric study of five open clusters (Czernik 5, Alessi 53, Berkeley 49, Berkeley 84, and Pfleiderer 3) in the Sloan Digital Sky Survey. The position and size of these clusters are determined using the ...

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