Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Publications of The Korean Astronomical Society
Journal Basic Information
Journal DOI :
The Korean Astronomical Society
Editor in Chief :
Volume & Issues
Volume 25, Issue 4 - Dec 2010
Volume 25, Issue 3 - Sep 2010
Volume 25, Issue 2 - Jun 2010
Volume 25, Issue 1 - Mar 2010
Selecting the target year
SURVEY ON THE OBSERVATIONAL RESEARCH ACTIVITIES USING MID-TO-LARGE SIZE TELESCOPES
Woo, Jong-Hak ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 107~112
DOI : 10.5303/PKAS.2010.25.4.107
By joining the Giant Magellan Telescope (GMT) project, Korean astronomers will get 10% of the GMT time, starting in the late 2010s. To prepare the GMT era, it is important to evaluate the current observational research activities. We surveyed the research programs performed by domestic astronomers during 2007A - 2010A period, using optical/near - IR telescopes with a medium to large aperture mirror (larger than 4 m). We describe the method and criteria of the survey, and present the results of the analysis based on the collected data.
COMPARISON OF TWO SCATTERING PHASE FUNCTIONS IN MULTIPLE SCATTERING ENVIRONMENT
Seon, Kwang-Il ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 113~118
DOI : 10.5303/PKAS.2010.25.4.113
The Henyey-Greenstein (H-G) phase function, which is characterized by a single parameter, has been generally used to approximate the realistic dust-scattering phase function in investigating scattering properties of the interstellar dust. Draine (2003) proposed a new analytic phase function with two parameters and showed that the realistic phase function is better represented by his phase function. If the H-G and Draine's phase functions are significantly different, using the H-G phase function in radiative transfer models may lead to wrong conclusions about the dust-scattering properties. Here, we investigate whether the H-G and Draine's phase functions would indeed produce significant differences in radiative transfer calculations for two simple configurations. For the uniformly distributed dust with an illuminating star at the center, no significant difference is found. However, up to ~ 20% of difference is found when the central star is surrounded by a spherical-shell dust medium and the radiation of
is considered. It would mean that the investigation of dust-scattering properties using the H-G phase function may produce errors of up to ~ 20% depending on the geometry of dust medium and the radiation wavelength. This amount of uncertainty would be, however, unavoidable since the configurations of dust density and radiation sources are only approximately available.
A STUDY OF THE CONSTELLATION MAPS IN MT. TAEBAEK'S HARVEST CEREMONY FLAG
Yang, H.J. ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 119~128
DOI : 10.5303/PKAS.2010.25.4.119
Gaecheonjeol is the National Foundation day of Korea when people hold a harvest ceremony. Nowadays, two representative harvest ceremonies of Korea are performed at Mt. Mari (摩利山) and Mt. Taebaek (太白山) on Gaecheonjeol (October 3rd). We study 28 flags with constellations appearing in the ceremony of Mt. Taebaek. These flags are lying in the outer of the circular stone wall during the ceremony. They represent an oriental heavenly star chart. We examine the shape, the connecting-pattern, the name, and the number of constellations drawn in the flags, and find several errors, such as, a wrong position, a typo of name, an irregular size, an omission, and so forth. Traditionally, the 28 oriental constellations are usually divided into four groups and each group has its own colour for each direction: Blue (E), Black (N), White (W), and Red (S). For the constellation flags in Mt. Taebaek, the colour of the flags is painted based on geographical directions, but the constellations are arranged followed by the direction of the celestial sphere. Thus, constellations in the northern and southern parts are counterchanged. Finally, we suggest some possible criteria for constellation map of the flags in this paper. CheonSangYeolChaBunYaJiDo (天象列次分野之圖) and CheonMunRyuCho (天文類抄) can be essential references for correcting constellations drawn in the flags of Mt. Taebaek.
DECIPHERING THE DOUBLE MEANINGS OF THE COWHERD STAR
Ahn, Sang-Hyeon ; Kim, Dong-Bin ; Lee, Yong-Sam ; Song, Doo-Jong ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 129~139
DOI : 10.5303/PKAS.2010.25.4.129
The Cowherd Star and the Weaving Maid Star have been famous stars in East Asian countries. Nowadays Altair is defined to be the Cowherd Star in public materials including science books, mass media, public outreach programs, and movies played in public planetariums and science museums. However, in astronomical books and star-charts in history, the Cowherd Big Star (牽牛大星) has been known to be Dabih or
Cap in the constellation Capricorn, and the asterism Cowherd consists of six stars including Dabih. Since the same title is given to the different objects simultaneously, considerable misunderstanding and confusion among the public have occurred. In this paper we consider this problem in two aspects. One aspect is which star has been defined to be the Cowherd Star in ancient literatures; the other is which stars were regarded as the Cowherd or the Cowherd Star in the historical records of occultation or conjunction in History of Koryo, Annals of the Choson Dynasty, and Daily Records of Royal Secretariat of the Choson Dynasty. As a result, we see that Altair has been regarded as the Cowherd Star in folklore and literature, but Dabih has been defined to be the Cowherd Big Star in astronomical works. An explanation proposed by previous researchers on the reason why such double meanings have been appeared is introduced. In the explanation, the fact that the Altair was defined as the Cowherd Star in ancient times had not been handed over properly, and the name of Cowherd was later put to the Dabih and its surrounding five stars to form one of 28 lunar lodges. Based upon these facts, we suggest the following ideas: (1) Altair should be introduced to be the Cowherd Star in public-friendly programs, and Dabih should be noticed to be the Cowherd Big Star in the field of history of astronomy. Dabih should be added as the astronomical Cowherd Big Star in academic books such as a dictionary of astronomical terminology. (2) The Korean pronunciation for Altair should be al-tear instead of al-tairu in accordance with the definition in the astronomical terminology dictionary compiled by the Korean Astronomical Society.
A STUDY ON THE LOCATIONS OF THE ROYAL ASTRONOMICAL BUREAU AND THE ROYAL ASTRONOMICAL OBSERVATORY IN THE JOSEON DYNASTY
Mihn, B.H. ; Lee, K.W. ; Ahn, Y.S. ; Lee, Y.S. ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 141~154
DOI : 10.5303/PKAS.2010.25.4.141
In the beginning of the Joseon dynasty, the Royal Astronomical Bureau (觀象監, shortly RAB) was established. After the double RAB had settled down by King Sejong (世宗), it continued to function until 1907. Before the Japanese invasion of Korea in 1592, the Joseon court had the Inner RAB in the Gyeongbok Palace (景福宮) and the Outer RAB in the Northen District Gwangwha-Bang (北部廣化坊) at the western side of the Changdeuk Palace (昌德宮). In the reign of King Sukjong (肅宗) the double system of the RAB was transformed into the Geumho-Gate (金虎門) Outer RAB and the Gaeyang-Gate (開陽門) Outer RAB. During the reconstruction of the Gyeongbok Palace in the early reign of King Gojong (高宗), the Gaeyang-Gate Outer RAB was replaced by the Yeongchu-Gate (迎秋門) Outer RAB in 1865. All RAB had the Royal Astronomical Observatory (觀天臺, RAO hereinafter), so called the Soganui-platform (小簡儀臺) on which the Soganui (小簡儀) has been put. The Soganui (小簡儀) is a small simplified armillary sphere. While the Gwangwha-Bang RAO handed down from the reign of King Sejong still exists, other RAOs, such as Gyeongbok Palace RAO, Gaeyang-Gate and Yeongchu-Gate RAOs, do not remain. According to our study, the Changgyeong Palace (昌慶宮) RAO was not indeed the RAO with the Soganui.
COORDINATE VALUES OF THE DETERMINATIVE STARS OF TWENTY EIGHT LUNAR LODGES IN THE ANCIENT CHINESE HISTORICAL ARCHIVES
Ahn, Sang-Hyeon ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 155~165
DOI : 10.5303/PKAS.2010.25.4.155
In this study, we investigate the changes in the equatorial lodge degrees and polar distance degrees of determinative stars in the ancient Chinese archives. Confirmed is the fact that the coordinate values of those determinative stars defined in B.C. 104 had been used until the 8th century but were modified by the observations of Li Chunfeng (李淳風) in the early 7th century and Yixing (一行) in 723 A.D. The results of this study are compared with those in History of Chinese Astronomical Observations of Pan Nai. By applying the results of comtemporary astrodynamical calculations, their reliability is checked, and the corrected catalogues of Shi Shi (石氏) and Yixing are provided. The positional accuracy of those observations is estimated to be one degree.
NEW VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER M35 (NGC 2168)
Jeon, Young-Beom ; Lee, Hye-Ran ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 167~176
DOI : 10.5303/PKAS.2010.25.4.167
In the region of the intermediate open cluster M35 (NGC 2168), the time-series of V CCD images was taken for 12 nights from December 18, 2007 to September 25, 2010. From this observation, we detected 22 variable stars including 15 new ones. They are 6
Scuti, a Cepheid, an RR Lyrae, 9 eclipsing binaries and 5 semi-long periodic and/or slow irregular type variable stars. For the V photometry of the
2 Scuti stars, the multi-frequency analysis was performed using the Discrete Fourier Transform and the linear least-square fitting.
AN EFFICIENT MONTE-CARLO ALGORITHM FOR DUST-SCATTERING STUDY
Seon, Kwang-Il ;
Publications of The Korean Astronomical Society, volume 25, issue 4, 2010, Pages 177~186
DOI : 10.5303/PKAS.2010.25.4.177
We developed an efficient Monte-Carlo algorithm to solve dust-scattering radiative transfer problems for continuum radiation. The method calculates the scattered intensities for various anisotropic factors (
) all at once, while actual photon packets are tracked following a scattering phase function given by a single anisotropic factor (
). The algorithm was tested by applying the method to a dust cloud embedding a star at the cloud center and found to provide accurate results within the statistical fluctuation that is intrinsic in Monte-Carlo simulations. It was found that adopting
= 0.4 - 0.5 in the algorithm is most efficient. The method would be efficient in estimating the anisotropic factor of the interstellar dust by comparing the observed data with radiative transfer models.