• article-nadc公众科学 | 基于公众科学的跨学科课程
    .ch-phase p { margin: 0; font-size: 14px; color: #5d7187; line-height: 1.65; } #cs-course-bg6 ...
    ); gap: clamp(18px, 3vw, 34px); align-items: start; } #cs-course-bg6 .ch-band--meaning .ch-h2 ...
    : -0.01em; } #cs-course-bg6 .ch-value p { margin: 0; font-size: 14px; color: #5d7187; ...
    , 20px); } #cs-course-bg6 #ch-value .ch-h2 { margin-bottom: 0; } #cs-course-bg6 .ch-access-head { ...
    .ch-section-head .ch-h2 { text-align: center; } #cs-course-bg6 .ch-btn { width: 100%; } } ...
  • article-nadcTAP Call for Proposals Semester 2021B
    for Proposals Semester 2021B Proposal Deadline: 25 March 202117:00 China Standard Time CFHT, P200 ...
    Proposals for the P200 should use the LaTeX proposal template.Please use the latest proposal template ...
    Note that: Proposals for the P200 can be accessed through theCOO solicitation information page.
    for writing proposals Four TAP workshops have been held at PKU/KIAA (1st), NAOC (2nd,3rd), XMU (4th ...
    ) and SYSU(5th).
  • article-nadcLAMOST助力揭开银河系氮增丰场星的双重起源与演化历程
    球状星团是链接星系与恒星演化的关键桥梁，大量研究表明球状星团内部普遍存在多重星族现象（Multiple Populations），其标志性特征是部分成员星（常称为第二代星，SG或2P）经历了不同环境条件下的核合成过程 ...
    为系统性搜寻这类化学特殊恒星，团队之前的研究基于LAMOST低分辨率光谱，通过对比蓝端CN分子带与CH分子带的强度，筛选出了一批氮增丰场星候选体。
    HE组呈现出较低的α元素丰度比，且具有更低的[X/Eu]，证明快中子俘获过程（r-process）对于元素富集的主导地位，这表明它们很可能来自被银河系吸积的大质量矮星系（如Gaia-Sausage-Enceladus ...
    下：HE组与LE组中子俘获元素丰度比[X/Eu]，其中又以[Fe/H] = -1.1为界划分为LE-富金属（蓝）、LE-贫金属（红）、HE-贫金属（绿）HE-贫金属（紫）四小组，三角形代表[X/Eu]平均值 ...
    另外，研究还指出，对于金属丰度 [Fe/H]≤−1.0 的氮增丰场星，在N/O比例上与JWST新发现的高红移“N-emitters”相似，这一发现为研究早期宇宙的星团形成提供了可能的本地参照样本 ...
  • article-nadcFAST第三批科学数据2019年8月1日-10月31日观测项目表
    H I Profiles as a Tool to Probe the Evolutionary Stages of Galaxy Mergers 下载 22 2019a- ...
    018-S Tsai, Chaowei H I Content of Mid-IR Bright, Low-Metallicity Blue Compact Dwarf Galaxies ...
    FAST-ASKAP synergetic HI observations 下载 31 2019a-037-S Tsai, Chaowei Tracking the H ...
    near a Dark-Matter Deficient Galaxy Group 下载 32 2019a-038-S Hu, Bo Mapping Cygnus-X ...
    Cooked in the ISM Soup: A Comprehensive Survey toward the ISM and Star Formation Process in Cygnus X ...
  • article-nadc厦门大学李昂教授团队在脉冲星PSR J1835−1106中合作发现反glitch现象
    未来，借助eXTP（增强型X射线时变与偏振探测空间天文台）等新一代天文观测设备，有望捕获更多类似事件，从而区分其起源究竟是内部超流体动力学还是外部磁层过程。
    -p. Yuan, Z.-h. Tu, A. Li, X. Zhou, and N.
    -H Tu and A.
    -P. Yuan, M.-Y. Ge, W.-T. Ye, S.-Q. Zhou, S.-J. Dang, Z.-R. Zhou, E. Gügercinoğlu, W.-H.
    X.
  • article-nadcThe First International WWT Tour Contest launched
    From 25th to 29th October,2021 (CST), the 31st ADASS meeting was held both in Cape Town, South Africa ...
    Points： OCT, 2021 Officially announce International WorldWide Telescope Contest (IWTC) BEFORE 30th ...
    APR, 2022 (Suggested) Deadline for submission of local contest 15th JUN, 2022 Deadline for submission ...
    Local contest in China (The fifth WorldWide Telescope Guided Tour Contest) has already launched on 25th ...
  • article-nadc云南天文台人员在热木星氢氦大气逃逸的研究取得进展
    密近轨道系外行星会收到来自恒星剧烈的X射线和极紫外（EUV）的高能辐射。在富气体的系外行星中，行星大气会吸收这些高能辐射，从而加热大气使其膨胀以克服行星的引力势能而逃逸，这种现象即行星大气逃逸。
    在2021年，我们通过分析一颗热木星WASP-121b在光学波段（Hα）的信息，证实这颗行星正在发生大气逃逸。
    在本工作中，研究人员基于课题组开发的流体动力学逃逸大气模型和辐射转移模型，首次使用了球对称的蒙特卡洛模型来模拟Lyα的共振散射[8]，得到Lyα的散射速率Pα分布（如图 ...
    从而限定了行星接收到的恒星X射线和极紫外辐射水平，以及行星大气中的氢氦丰度比（高于太阳丰度，约为98/2），推断出这颗行星周围存在膨胀且逃逸的中性氢和氦气体，为行星大气的理论研究提供了新的方法和参考。
    左图为Hα透射光谱，其中带误差棒的散点为观测数据，红色实线为最佳拟合模型，该模型的大气氢氦比为98/2, XUV辐射流量为基准值的0.5倍，X射线流量与总XUV流量之比即谱指数为0.3。
  • article-nadc厦门大学李昂教授团队和合作者在脉冲星周期跃变的多波段研究方面取得进展（II）
    下一步，研究人员计划引入X射线望远镜（比如eXTP）的计时数据，结合射电、伽马射线和X射线的多波段观测，进一步分析更多脉冲星的周期跃变现象，研究众多类型周期跃变事件的物理，以深入理了解脉冲星结构和跃变理论 ...
    相关研究工作列表： P. Liu, J.-P. Yuan, M.-Y. Ge, W.-T. Ye, S.-Q. Zhou, S.-J. Dang, Z.-R. Zhou, E.
    -H Tu, P. Wang, A. Li, D. Li, and N.
    -P. Yuan, M.-Y. Ge, W.-T. Ye, S.-Q. Zhou, S.-J. Dang, Z.-R. Zhou, E. Gügercinoğlu, W.-H.
    X.
  • article-nadcLAMOST发现锕系元素增丰星，揭示重元素起源新线索
    发现：锕系元素增丰星家族又添一员 LAMOST J0804+5740是一颗极贫金属（[Fe/H] = -2.38）、r-过程增丰（[Eu/Fe] = 0.80）的恒星。
    图2：r-过程增丰星中log ε (Th/Eu)与[Fe/H]的关系。空心圆代表吸积恒星（ex-situ），空心三角形代表本地恒星（in-situ）。
    右边Y轴表示根据log ε (Th/Eu)计算的年龄。黑色实线对应锕系元素增丰的标准。此外，黑色虚线表示宇宙的年龄（13.772 ± 0.059）。
  • article-nadc厦门大学李昂教授团队和合作者在脉冲星PSR J0922+0638自转行为的系统分析方面取得进展
    -H Tu and A.
    -P. Yuan, M.-Y. Ge, W.-T. Ye, S.-Q. Zhou, S.-J. Dang, Z.-R. Zhou, E. Gügercinoğlu, , P.
    -P. Yuan, M.-Y. Ge, W.-T. Ye, S.-Q. Zhou, S.-J. Dang, Z.-R. Zhou, E. Gügercinoğlu, W.-H.
    Wang, P. Wang, A. Li, D. Li, and N.
    X.
  • meeting21厘米宇宙学国际前沿讲习班 | The Summer School for 21 CM Cosmology
    organizing a summer school on 21 cm cosmology, which is scheduled to be held between July 2nd to 15th ...
    , 2025, in Xi'an Sanxi, P.R.China.
    organizing a summer school on 21 cm cosmology, which is scheduled to be held between July 2nd to 15th ...
    , 2025, in Xi'an Sanxi, P.R.China.
  • article-nadcThe 4th WWT Guided Tour Contest Concluded
    On August 20, the forth WorldWide Telescope (WWT) Guided Tour Contest Award Ceremony was held in Guangdong Experimental High School. The ceremony was broadcasted online at three platforms: Nandu live, Bilibili and China Science Communication. More than a hundred thousand astronomers, educa ...
  • meeting21厘米宇宙学2024年度学术研讨会与天籁计划合作组会议 | 21 cm Cosmology Workshop 2024 & Tianlai Collaboration Meeting
    organizing a community workshop on 21 cm cosmology, which is scheduled to be held between July 21st to 26th ...
    , 2024, in Hangzhou Zhejiang, P.R.China.
  • article-nadc不同分子如何“测温”？天马射电望远镜为暖分子气体测量提供新见解
    研究团队证实，在高温条件下（T > 20 K），常用的氨分子（NH₃）测温法可能会低估气体的真实温度；相比之下，甲基乙炔（CH₃CCH）能更准确地示踪暖分子气体（T = 20–100 ...
    与此同时，团队通过毫米波观测获得了CH₃CCH的多条谱线，并将其转动温度与氨分子结果进行比较。 图1 CH₃CCH统计平衡计算的结果。
    在密度大于10⁴cm-³后，由CH3CCH得到的转动温度基本上与气体温度一致。
    而CH₃CCH的转动温度随环境变化的响应更灵敏，能更清晰地辨识不同恒星形成区的物理差异 。分析表明，这种差异源于两种分子在暖气体中对温度变化的响应机制不同，并非观测误差导致。
    因此，在暖分子气体环境中， CH₃CCH更适宜作为温度探针。 图2 对比CH₃CCH和NH₃得到的转动温度。由NH₃得到的转动温度明显低于CH₃CCH得到的转动温度。
  • article-nadcPSP项目陆续发现3颗候选体并获得证认
    Vinokurov（俄罗斯科学院特设天体物理台），P.
    从3x300秒叠加的CCD帧中测得该暂现源的Hα亮度为15.71±0.03星等。
    也得到了B和R标准滤镜的亮度，分别为：16.79±0.02星等（5x240秒；世界时2021年9月11.909日）和16.39±0.01星等（5x120秒；世界时2021年9 ...
    Hα和R波段图像可以在这里找到（译注：见下图）。 图5：2米RCC望远镜获取的Hα和R波段图像 该暂现源的Hα亮度强烈支持将其分类为新星。
    Valcheva，P.
  • article-nadc研究人员基于LAMOST数据在强发射线星系光谱研究中取得新进展
    研究人员发现，在近1550例豌豆星系光谱中，仅有5例具有明显双峰窄线的绿豌豆星系，根据X射线、中红外、射电等多波段测光和光谱数据，利用能谱拟合和光学谱线诊断的方法高度可信地认证了该样本中的AGN活动。
    ~P., Bennert N., Urry C.
    ., 2009, MNRAS, 399, 1191. doi:10.1111/j.1365-2966.2009.15383.x [2] Liu S., Luo A.
    ., Yang H., Shen S.-Y., Wang J.-X., Zhang H.
  • metadataA catalog of early-type Hα emission-line stars and 62 newly confirmed Herbig Ae/Bes from LAMOST DR7
    The spectra are classified into three morphological types (10 subtypes) based on Hα emission-line profiles ...
    Some spectra contaminated by nebula emission lines such as from H II regions are flagged in the catalog ...
    stars with stellar winds or accretion flows by calculating the terminal and peak velocities based on P-Cygni ...
    or inverse P-Cygni profiles.
    More important, with two color–color diagrams, (H-Ks, J-H) and (Ks-W1, H-Ks), of a collection of known ...
  • metadataA catalog of early-type Hα emission-line stars and 62 newly confirmed Herbig Ae/Bes from LAMOST DR7
    The spectra are classified into three morphological types (10 subtypes) based on Hα emission-line profiles ...
    Some spectra contaminated by nebula emission lines such as from H II regions are flagged in the catalog ...
    stars with stellar winds or accretion flows by calculating the terminal and peak velocities based on P-Cygni ...
    or inverse P-Cygni profiles.
    More important, with two color–color diagrams, (H-Ks, J-H) and (Ks-W1, H-Ks), of a collection of known ...
  • metadataA catalog of early-type Hα emission-line stars and 62 newly confirmed Herbig Ae/Bes from LAMOST DR7
    The spectra are classified into three morphological types (10 subtypes) based on Hα emission-line profiles ...
    Some spectra contaminated by nebula emission lines such as from H II regions are flagged in the catalog ...
    stars with stellar winds or accretion flows by calculating the terminal and peak velocities based on P-Cygni ...
    or inverse P-Cygni profiles.
    More important, with two color–color diagrams, (H-Ks, J-H) and (Ks-W1, H-Ks), of a collection of known ...
  • metadataA catalog of early-type Hα emission-line stars and 62 newly confirmed Herbig Ae/Bes from LAMOST DR7
    The spectra are classified into three morphological types (10 subtypes) based on Hα emission-line profiles ...
    Some spectra contaminated by nebula emission lines such as from H II regions are flagged in the catalog ...
    stars with stellar winds or accretion flows by calculating the terminal and peak velocities based on P-Cygni ...
    or inverse P-Cygni profiles.
    More important, with two color–color diagrams, (H-Ks, J-H) and (Ks-W1, H-Ks), of a collection of known ...
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