分类： 天文学 >> 天文学 提交时间： 2023-02-19
Xu Yang
Yi Hu
Zhaohui Shang
Bin Ma
Michael C. B. Ashley
Xiangqun Cui
Fujia Du
Jianning Fu
Xuefei Gong
Bozhong Gu
Peng Jiang
Xiaoyan Li
Zhengyang Li
Charling Tao
Lifan Wang
Lingzhe Xu
Shi-hai Yang
Ce Yu
Xiangyan Yuan
Ji-lin Zhou
摘要： AST3-2 is the second of the three Antarctic Survey Telescopes, aimed at wide-field time-domain optical astronomy. It is located at Dome A, Antarctica, which is by many measures the best optical astronomy site on the Earth's surface. Here we present the data from the AST3-2 automatic survey in 2016 and the photometry results. The median 5$\sigma$ limiting magnitude in $i$-band is 17.8 mag and the light curve precision is 4 mmag for bright stars. The data release includes photometry for over 7~million stars, from which over 3,500 variable stars were detected, with 70 of them newly discovered. We classify these new variables into different types by combining their light curve features with stellar properties from surveys such as StarHorse.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Xu Yang
Yi Hu
Zhaohui Shang
Bin Ma
Michael C. B. Ashley
Xiangqun Cui
Fujia Du
Jianning Fu
Xuefei Gong
Bozhong Gu
Peng Jiang
Xiaoyan Li
Zhengyang Li
Charling Tao
Lifan Wang
Lingzhe Xu
Shi-hai Yang
Ce Yu
Xiangyan Yuan
Ji-lin Zhou
摘要： AST3-2 is the second of the three Antarctic Survey Telescopes, aimed at wide-field time-domain optical astronomy. It is located at Dome A, Antarctica, which is by many measures the best optical astronomy site on the Earth's surface. Here we present the data from the AST3-2 automatic survey in 2016 and the photometry results. The median 5$\sigma$ limiting magnitude in $i$-band is 17.8 mag and the light curve precision is 4 mmag for bright stars. The data release includes photometry for over 7~million stars, from which over 3,500 variable stars were detected, with 70 of them newly discovered. We classify these new variables into different types by combining their light curve features with stellar properties from surveys such as StarHorse.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
摘要： Gravitational wave detection in space promises to open a new window in astronomy to study the strong field dynamics of gravitational physics in astrophysics and cosmology. The present article is an extract of a report on a feasibility study of gravitational wave detection in space, commissioned by the National Space Science Center, Chinese Academy of Sciences almost a decade ago. The objective of the study was to explore various possible mission options to detect gravitational waves in space alternative to that of the (e)LISA mission concept and look into the requirements on the technological fronts. On the basis of relative merits and balance between science and technological feasibility, a set of representative mission options were studied and in the end a mission design was recommended as the starting point for research and development in the Chinese Academy of Sciences. The mission design was eventually adopted by the current TAIJI mission as the baseline parameters for the project. Subject to technological constraints, the baseline parameters of the TAIJI mission were designed in such a way to optimise the capability of a spaceborne gravitational wave detector to probe high redshift light seed, intermediate mass black holes and thereby shed important light on the structure formation in early Universe.
点击量
待评议
点击量
下载量
评论
