Subjects: Astronomy >> History of Astronomy Subjects: Astronomy >> Astronomical Instruments and Techniques submitted time 2024-04-10
Abstract: Ancient China recorded a wealth of astronomical observations, notably distinguished by the inclusion of empirical measurements of stellar observations. However, determining the precise observational epochs for these datasets poses a formidable challenge. This study employs the Generalized Hough Transform methodology to analyze two distinct sets of observational data originating from the Song and Yuan dynasties, allowing accurate estimation of the epochs of these stellar observations. This research introduces a novel and systematic approach, offering a scholarly perspective for the analysis of additional datasets within the domain of ancient astronomical catalogs in future investigations.
Subjects: Astronomy >> Astrophysical processes submitted time 2023-01-17 Cooperative journals: 《天文研究与技术》
Abstract: Chinese ancient celestial phenomenon records are the unique astronomical observation data in the world, which have important scientific value. In recent years, with the rapid development of astronomical observations and theories, there have been many new advances in the research of historical supernovae and solar activity cycle. In contrast, the compilations of ancient celestial phenomenon records are still at the level of the late 1980s, and there are defects in the information utilization, such as inconvenient retrieval, and lack of corresponding analysis, which can hardly satisfy the needs of astronomical research. In this paper, the Chinese Ancient Celestial Phenomenon Catalogue based on document-oriented database, full-text retrieval, grammatical analysis and Web technologies has been designed and implemented. The catalogue realizes the digital storage and retrieval of various scientific and historical information in ancient celestial phenomenon records. Through the construction and development of this basic platform, Chinese ancient celestial phenomenon records will be more accessible to astronomers around the world, and promote the intercross research of collation, verification and utilization of ancient celestial phenomenon records.
Subjects: Astronomy >> Astrophysical processes submitted time 2022-11-17 Cooperative journals: 《天文研究与技术》
Abstract: Semi-detached binaries are significant targets for the study of the formation and evolution of interacting binaries. Rapid modeling tool is highly required to derive the parameters with large amount of stars to be observed by many recent time-domain photometric surveys. In this work, based on a neural network, a light curve modeling of semi-detached binaries is proposed, which can derive orbital inclination(incl), relative radius(R/a), the mass ratio(q), and temperature ratio(T2/T1) fast via the observational light curve and known effective temperature of the primary star. The results of Kepler's light curve modeling show that the model can accurately fit the light curves of pulsating eclipsing binaries (the fitting degree can reach more than 0.9). For a target whose relative measurement error, orbital inclination, the amplitude of light curve, and temperature ratio are 0.01, ~90°, 1.84 mag, and 0.6, the measurement errors are 1.251, 0.004, 0.008 and 0.003 for incl, R/a, q, and T2/T1, respectively. In addition, as an application, the proposed model in this work can be deployed on other photometric data by simply replacing the train data, which provides an effective tool to obtain a large number of parameters of semi-detached binaries and fast search for candidates of abnormal binaries.
Subjects: Astronomy >> Astrophysical processes submitted time 2020-06-09 Cooperative journals: 《天文研究与技术》
Abstract:环境信息是大天区面积多目标光纤光谱望远镜(LAMOST,即郭守敬望远镜)运行状态的一部分,用于辅助望远镜的日常维护、观测以及后期数据处理。环境信息来源于多个子系统,而子系统的数据存储由不同单位设计,使得数据存储环境复杂,不利于统一检索。基于异步协程,我们提出了一种异构环境信息检索的方法。该方法利用数据库代理对象工厂整合多个数据库及检索字段信息,通过客户端和Web浏览器提供远程服务,以自定义检索命令的方式实现对异构数据库的检索。本方法充分考虑了后期升级的需求,保留多种数据库和应用接口,便于更多数据库和应用的接入。目前基于该方法开发的检索系统已部署于LAMOST运行环境,在实际运行中简化了运行环境检索操作,提高了工作效率和数据获取的精准度,提升了维护和观测效率。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-07-30 Cooperative journals: 《天文研究与技术》
Abstract: CCD(Charge Coupled Device)图像中的宇宙线是来自于外太空的高能粒子,它穿过大气层,与大气层的粒子发生相互作用形成次级粒子,最后落在CCD上。μ子是大气层宇宙线的主要成分,为了研究这些μ子的性质和变化规律,首先需要对图像中的μ子进行甄选。本文介绍一种快速有效地从CCD图像中甄选μ子的方法。采用拉普拉斯边缘检测法从CCD图像中提取宇宙线候选像素列表,去除其中的坏像素和噪声,然后使用凝聚层次聚类算法将宇宙线像素聚类成宇宙线事件,对宇宙线事件进行特征提取和分类,从中甄选宇宙线μ子。最后对甄选结果进行总结分析。
Subjects: Astronomy >> Astrophysical processes submitted time 2019-07-30 Cooperative journals: 《天文研究与技术》
Abstract:经过十余年的不断建设和发展,中国虚拟天文台(China-VO)已成为支撑天文学观测、研究、教学的重要技术和资源平台。随着多信使天文学和时域天文学时代的到来,虚拟天文台也需要升级自身的核心能力,以给天文工作者提供更精准的服务和技术支撑。为此,中国虚拟天文台团队结合天文学的发展方向和信息技术发展趋势梳理了一份核心技术需求清单,并以问卷的形式针对领域内专家和用户开展了调研。通过对调研结果的统计和分析,中国虚拟天文台明确了未来一段时期的主要努力方向和目标,计划采用平台化的开发模式,并开放第三方开发接口,以吸引更多感兴趣的开发者基于虚拟天文台资源做出实用的工具,更好地实现资源与技术向服务的快速转换。
Subjects: Astronomy >> Astrophysical processes submitted time 2018-05-29 Cooperative journals: 《天文研究与技术》
Abstract: 在利用LAMOST巡天数据进行特殊天体搜寻或样本构建时,以及在处理LAMOST不断累积的低信噪比光谱时,通常需要耗费科学家大量的时间完成人工识谱。针对这样的问题,我们设计并实现了一套专家识谱平台。该平台是集光谱可视化、光谱分析、多波段图像融合、多种数据挖掘算法等功能于一体的科学与科普教研平台。利用该平台,天文学家进行天体搜寻、样本构建等科学研究将会变得相对容易;通过该平台,高校教师可以开展各种有天文特色的教研活动;借助群体力量,该平台将能逐步消化LAMOST不断积累的标注为UNKNOWN的未知光谱数据。
Subjects: Astronomy >> Astrophysical processes submitted time 2017-10-20 Cooperative journals: 《天文研究与技术》
Abstract:随着大规模光谱巡天项目的规划、实施和运行,从庞大数量的天体光谱中自动分析、高效挖掘和快速提取信息,获取天体的有效物理参量,是天文学者关注的焦点和当代天文研究的重要课题。大部分天文学研究工作基于光谱分析开展,各种迅速发展的光谱分析工具的便捷性和易用性对于探究天文光谱的特征具有重要的促进意义。针对国内外目前已经完成、正在运行和即将开展的大型光谱巡天项目,描述了一些巡天项目并指出了运用光谱分析工具的重要意义。以7种常用光谱分析软件VOSpec, VOSED, SpecView, Iris, SPLAT,CASSIS, ASERA为例,介绍了光谱分析软件的基本特点和主要功能,同时比较了这些软件应用环境的异同,为天文学家选择和运用光谱分析工具提供一定的指导和参考。
Subjects: Astronomy >> Astrophysical processes submitted time 2016-11-16
Abstract:四百年前伽利略发明了天文望远镜,使人类首次摆脱了用肉眼直接观测天空的历史,为从哥白尼开始的天文学革命提供了大量的科学证据。历史悠久的天文学经过哥白尼、伽利略、开普勒和牛顿等人的发展,演变成了一门崭新的科学,同时也催生了现代科学技术。
Peer Review Status:Awaiting Review
Subjects: Astronomy >> Astrophysical processes submitted time 2016-11-16
Abstract:目前,虚拟天文台已经成为世界天文学界乃至 IT 界的热门话题。美国、欧盟、英国的虚拟天文台计划已经进入实施阶段,更多国家的类似计划正在酝酿之中,国际虚拟天文台联盟初现端倪。如此形势之下,中国为什么有必要建立自己的虚拟天文台?中国虚拟天文台将有何特色,对国际虚拟天文台会有怎样的贡献?中国虚拟天文台将采用何种体系结构,何时能实现?本文就这些问题进行了探讨。
Peer Review Status:Awaiting Review