Journal of the Korean Astronomical Society最新文献_第2页

A SEARCH FOR EXOPLANETS AROUND NORTHERN CIRCUMPOLAR STARS VI. DETECTION OF PLANETARY COMPANIONS ORBITING THE GIANTS HD 60292 AND HD 112640 在北环极恒星周围寻找系外行星vi.探测环绕巨行星hd 60292和hd 112640的伴星

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2020-02-01 DOI: 10.5303/JKAS.2020.53.1.27

Byeong-Cheol Lee, Myeong-Gu Park, I. Han, T. Bang, Hyeong-Il Oh, Yeon-Ho Choi

引用次数: 1

A Study of Small Flares Associated with Plasma Blobs Outflowing along Post-CME Rays 与等离子体斑点沿cme后射线外流相关的小耀斑的研究

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2020-02-01 DOI: 10.5303/JKAS.2020.53.1.1

Yoo Jung Kim, R. Kwon, J. Chae

引用次数: 0

OBSERVING SITES FOR THE CENTRAL SOLAR ECLIPSES IN ANCIENT CHINESE HISTORY 中国古代日食中心的观测地点

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2020-01-01 DOI: 10.5303/JKAS.2020.53.6.125

Sang-Hyeon Ahn

{"title":"OBSERVING SITES FOR THE CENTRAL SOLAR ECLIPSES IN ANCIENT CHINESE HISTORY","authors":"Sang-Hyeon Ahn","doi":"10.5303/JKAS.2020.53.6.125","DOIUrl":"https://doi.org/10.5303/JKAS.2020.53.6.125","url":null,"abstract":"We determine the observing sites for eclipses of large magnitude recorded in ancient Chinese chronicles from 200 BCE to 900 CE, by adopting the difference between terrestrial time and universal time, ∆T , given by Morrison & Stephenson (2004). The records of solar eclipses with large magnitude are divided into four groups in accordance with the historical variations of the capital cities of ancient Chinese dynasties. We determine areas in which all the eclipses in each group, with an eclipse magnitude larger than a certain threshold value, could be observed. We find that these areas coincide with the historical capitals, which agrees with the general idea that the solar eclipses were observed at the capital of each dynasty. This result also verifies the ∆T values during the period from 100 BCE to 400 CE, during which historical records of eclipses are so rare that the ∆T values can only be obtained by interpolating the long-term data. Moreover, we show that the eclipses described by the term Ji in East-Asian history are not all total eclipses; their mean magnitude is 0.96± 0.04. We find that complementary expressions, such as dark daytime and appearance of stars during the eclipse, strengthen the possibility that eclipses described by the term Ji were total. We also provide quantitative definitions for expressions such as ‘being not complete and like a hook’, ‘being almost complete’, ‘visibility of stars during the eclipse’, and ‘darkness during an eclipse.’ The literal meanings of these expressions are in agreement with the recent physical modeling of sky brightness during total eclipses provided by Können & Hinz (2008).","PeriodicalId":49994,"journal":{"name":"Journal of the Korean Astronomical Society","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70738131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SUNSPOT AREA PREDICTION BASED ON COMPLEMENTARY ENSEMBLE EMPIRICAL MODE DECOMPOSITION AND EXTREME LEARNING MACHINE 基于互补系综经验模态分解和极限学习机的太阳黑子面积预测

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2020-01-01 DOI: 10.5303/JKAS.2020.53.6.139

Lingling Peng

引用次数: 1

CHEMICAL DIAGNOSTICS OF THE MASSIVE STAR CLUSTER-FORMING CLOUD G33.92+0.11. IV. HIERARCHICAL STRUCTURE 大质量星团形成云g33.92 +0.11的化学诊断。四、层次结构

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2020-01-01 DOI: 10.5303/JKAS.2020.53.3.77

Y. Minh, H. Liu, H. Chen

引用次数: 0

MECHANISM INDUCING GAS SUPPLY TO THE CENTRAL 10 PARSEC OF THE MILKY WAY 银河系中心10秒差距的气体供应机制

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2020-01-01 DOI: 10.5303/JKAS.2020.53.6.117

Hannah L. Morgan, Sungsoo S. Kim, Jihye Shin, Kyungwon Chun, So-Myoung Park, Joowon Lee, Y. Minh

引用次数: 0

NEUTRON STARS IN THE GALACTIC CENTER 银河系中心的中子星

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2018-10-01 DOI: 10.5303/JKAS.2018.51.5.165

Chunglee Kim, M. Davies

引用次数: 5

GPU-ACCELERATED SPECKLE MASKING RECONSTRUCTION ALGORITHM FOR HIGH-RESOLUTION SOLAR IMAGES 高分辨率太阳图像的gpu加速散斑掩蔽重建算法

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2018-06-01 DOI: 10.5303/JKAS.2018.51.3.65

Yan-fang Zheng, Xuebao Li, Tian Huifeng, Qiliang Zhang, C. Su, Lingyi Shi, Zhou Ta

{"title":"GPU-ACCELERATED SPECKLE MASKING RECONSTRUCTION ALGORITHM FOR HIGH-RESOLUTION SOLAR IMAGES","authors":"Yan-fang Zheng, Xuebao Li, Tian Huifeng, Qiliang Zhang, C. Su, Lingyi Shi, Zhou Ta","doi":"10.5303/JKAS.2018.51.3.65","DOIUrl":"https://doi.org/10.5303/JKAS.2018.51.3.65","url":null,"abstract":"The near real-time speckle masking reconstruction technique has been developed to accelerate the processing of solar images to achieve high resolutions for ground-based solar telescopes. However, the reconstruction of solar subimages in such a speckle reconstruction is very time-consuming. We design and implement a new parallel speckle masking reconstruction algorithm based on the Compute Unified Device Architecture (CUDA) on General Purpose Graphics Processing Units (GPGPU). Tests are performed to validate the correctness of our program on NVIDIA GPGPU. Details of several parallel reconstruction steps are presented, and the parallel implementation between various modules shows a significant speed increase compared to the previous serial implementations. In addition, we present a comparison of runtimes across serial programs, the OpenMP-based method, and the new parallel method. The new parallel method shows a clear advantage for large scale data processing, and a speedup of around 9 to 10 is achieved in reconstructing one solar subimage of 256×256 pixels. The speedup performance of the new parallel method exceeds that of OpenMP-based method overall. We conclude that the new parallel method would be of value, and contribute to real-time reconstruction of an entire solar image.","PeriodicalId":49994,"journal":{"name":"Journal of the Korean Astronomical Society","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41291406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Contribution of Stellar Winds to Cosmic Ray Production 恒星风对宇宙射线产生的贡献

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2018-04-20 DOI: 10.5303/JKAS.2018.51.2.37

Jeong-Se Seo, Hyesung Kang, D. Ryu

{"title":"The Contribution of Stellar Winds to Cosmic Ray Production","authors":"Jeong-Se Seo, Hyesung Kang, D. Ryu","doi":"10.5303/JKAS.2018.51.2.37","DOIUrl":"https://doi.org/10.5303/JKAS.2018.51.2.37","url":null,"abstract":"Massive stars blow powerful stellar winds throughout their evolutionary stages from the main sequence to Wolf-Rayet phases. The amount of mechanical energy deposited in the interstellar medium by the wind from a massive star can be comparable to the explosion energy of a core-collapse supernova that detonates at the end of its life. In this study, we estimate the kinetic energy deposition by massive stars in our Galaxy by considering the integrated Galactic initial mass function and modeling the stellar wind luminosity. The mass loss rate and terminal velocity of stellar winds during the main sequence, red supergiant, and Wolf-Rayet stages are estimated by adopting theoretical calculations and observational data published in the literature. We find that the total stellar wind luminosity due to all massive stars in the Galaxy is about $L_wapprox 1.1times 10^{41}$ erg/s, which is about 1/4 of the power of supernova explosions, $L_{SN} approx 4.8times 10^{41}$ erg/s. If we assume that $sim 1-10$ % of the wind luminosity could be converted to Galactic cosmic rays (GCRs) through collisonless shocks such as termination shocks in stellar bubbles and superbubbles, colliding-wind shocks in binaries, and bow-shocks of massive runaway stars, stellar winds might be expected to make a significant contribution to GCR production, though lower than that of supernova remnants.","PeriodicalId":49994,"journal":{"name":"Journal of the Korean Astronomical Society","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46369824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

A GOLDEN DECADE OF GAMMA-RAY PULSAR ASTRONOMY 伽马射线脉冲星天文学的黄金十年

IF 1 4区物理与天体物理

Journal of the Korean Astronomical Society Pub Date : 2018-01-01 DOI: 10.5303/JKAS.2018.51.6.171

C. Hui

引用次数: 3