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国家自然科学基金(11263001)

作品数:2 被引量:4H指数:1
相关作者:皮青峰张立云更多>>
相关机构:中国科学院国家天文台贵州大学更多>>
发文基金:国家自然科学基金贵州省自然科学基金更多>>
相关领域:自然科学总论天文地球更多>>

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基于世界最大500米口径球面射电望远镜建设国际天文科普基地和科普云平台被引量:4
2015年
国家重大科技基础设施500米口径球面射电望远镜(简称FAST)项目是中科院与贵州省共建的一个重大科技项目,建设后FAST将成为世界最大单口径天文射电望远镜,并在未来二十年至三十年内保持世界领先地位。FAST项目建设将使贵州省在较短时间内发展成为世界天文重要科普基地的之一。为抓住这个历史的机遇,搭建基于世界最大的500米口径球面射电望远镜的国际化科普基地和科普云平台建设,开展天文科学知识普及,提高公众科学文化素质,这对社会公众特别是青少年是非常必要的,对于启发和培养青少年的科学探索精神,提高我国的国民科学素养有重要的现实意义。
张立云皮青峰
关键词:FAST科普基地射电天文望远镜
Chromospheric activity on the late-type star V1355 Ori using Lijiang 1.8-m and 2.4-m telescopes
2016年
We obtained new high-resolution spectra using the Lijiang 1.8-m and 2.4-m telescopes to inves- tigate the chromospheric activities of V1355 Ori as indicated in the behaviors of Ca n H&K, Hγ HT, H/3, Na1 D1, D2, Ha and Ca II infrared triplet (IRT) lines. The observed spectra show obvious emissions above the continuum in Ca II H&K lines, absorptions in the Hδ, Hγ, H/3 and NaI D1, D2 lines, variable behavior (filled-in absorption, partial emission with a core absorption component or emission above the continuum) in the Ha line, and weak self-reversal emissions in the strong filled-in absorptions of the Ca II IRT lines. We used a spectral subtraction technique to analyze our data. The results show no excess emission in the H6 and H7 lines, very weak excess emissions in the Na I D1, D2 lines, excess emission in the H/3 line, clear excess emission in the Ha line, and excess emissions in the Ca II IRT lines. The value of the ratio of EWs542/EWsa9s is in the range 0.9 to 1.7, which implies that chromospheric activity might have been caused by plage events. The value of the ratio EHδ/EHβ is above 3, indicating that the Balmer lines would arise from prominence-like material. We also found time variations in light curves associated with equiva- lent widths of chromospheric activity lines in the Na I D1, phenomena can be explained by plage events, which are activity indicators. D2, Ca II IRT and Ha lines in particular. These consistent with the behavior of chromospheric
Qing-Feng PiLi-Yun ZhangLiang ChangXian-Ming HanHong-Peng LuXi-Liang ZhangDai-Mei Wang
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