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The first low-mass eclipsing binary within the fully convective zone from TMTS 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2024, 卷号: 531, 期号: 1, 页码: 1765-1775
作者:  Liu, Cheng;  Wang, Xiaofeng;  Zhang, Xiaobing;  Kovalev, Mikhail;  Lin, Jie
  |  收藏  |  浏览/下载：24/0  |  提交时间：2024/06/11
The first low-mass eclipsing binary within the fully convective zone from TMTS 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2024, 卷号: 531, 期号: 1, 页码: 1765-1775
作者:  Liu, Cheng;  Wang, Xiaofeng;  Zhang, Xiaobing;  Kovalev, Mikhail;  Lin, Jie
  |  收藏  |  浏览/下载：2/0  |  提交时间：2024/07/09
On the period-density relations and lower period limit of contact binaries 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2023, 卷号: 523, 期号: 1, 页码: 1394-1398
作者:  Zhang, Xiaobin;  Chen XH(陈兴浩);  Fu, Jianning;  Li Y(李焱)
  |  收藏  |  浏览/下载：32/0  |  提交时间：2023/08/14
Photometric Study and Absolute Parameter Estimation of Six Totally Eclipsing Contact Binaries 期刊论文  OAI收割
Astronomical Journal, 2021, 卷号: 162, 期号: 1, 页码: 13
作者:  Li, Kai;  Xia, Qi-Qi;  Kim, Chun-Hwey;  Gao, Xing;  Hu, Shao-Ming
  |  收藏  |  浏览/下载：31/0  |  提交时间：2022/06/30
Absolute parameters and observed flares in the M-type detached eclipsing binary 2MASS J04100497+2931023 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2021, 卷号: 21, 期号: 5, 页码: 9
作者:  Meng, Gang;  Zhang, Li-Yun;  Pi, Qing-Feng;  Long, Liu;  Han, Xianming L.
  |  收藏  |  浏览/下载：28/0  |  提交时间：2021/08/02
Synchronous X-ray/Optical QPOs from the Black Hole LMXB MAXI J1820+070 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2021
作者:  HXMT
  |  收藏  |  浏览/下载：57/0  |  提交时间：2022/02/08
black hole physics  Low Mass X-ray Binaries  accretion  accretion  discs  stars: individual (MAXI J1820+070)  Astrophysics - High Energy  Astrophysical Phenomena  Abstract: We present high-speed optical photometry from SAAO and SALT on the black hole LMXB MAXI J1820+070 (ASSASN-18ey), some of it simultaneous with NICER, Swift and Insight-HXMT X-ray coverage. We detect optical Quasi-Periodic Oscillations (QPOs) that move to higher frequencies as the outburst progresses, tracking both the frequency and evolution of similar X-ray QPOs previously reported. Correlated X-ray/optical data reveal a complex pattern of lags, including an anti-correlation and a sub-second lag that evolve over the first few weeks of outburst. They also show correlated components separated by a lag equal to the QPO period roughly centered on zero lag, implying that the inter-band variability is strongly and consistently affected by these QPOs at a constant phase lag of roughly ±Ю The synchronisation of X-ray and optical QPOs indicates that they must be produced in regions physically very close to each other  we thus propose that they can be explained by a precessing jet model, based on analogies with V404 Cyg and MAXI J1348-630.  
Contact binaries at different evolutionary stages 期刊论文  OAI收割
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2020, 卷号: 20, 期号: 10, 页码: 20
作者:  Qian SB(钱声帮);  Zhu LY(朱俐颖)
  |  收藏  |  浏览/下载：36/0  |  提交时间：2020/12/28
Case AD, AR, and AS binary evolution and their possible connections with W UMa binaries 期刊论文  OAI收割
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2020, 卷号: 492, 期号: 2, 页码: 2731-2738
作者:  Jiang DK(姜登凯)
  |  收藏  |  浏览/下载：15/0  |  提交时间：2020/03/31
Introducing a special collection of papers in the Journal of High Energy Astrophysics on the Early Results of China's 1st X-ray Astronomy Satellite: Insight-HXMT 期刊论文  OAI收割
Journal of High Energy Astrophysics, 2020, 卷号: 27, 页码: 51-52
作者:  HXMT
  |  收藏  |  浏览/下载：54/0  |  提交时间：2022/02/08
Astrophysics - High Energy Astrophysical Phenomena  Abstract: Insight-HXMT is the first Chinese X-ray astronomical mission, launched successfully on June 15, 2017, from China's Jiuquan Satellite Launch Center. Insight-HXMT was designed to have a broad energy coverage in X-rays, from 1-250 keV, with excellent timing and adequate energy resolution at soft X-rays, and the largest effective area at hard X-rays. This allows, in particular, to observe bright sources like X-ray binaries (XRBs) in their bright/outburst states with high cadence and high statistics at hard and soft X-rays at once. It was then expected that the Insight-HXMT mission will bring us new insights regarding the characteristics of several source classes. Examples include characterizing High-Mass X-ray Binaries (HMXBs) and the outburst evolution of Low-Mass X-ray Binaries (LMXBs). For instance, in HMXB systems, the region around their Alfven radius that is responsible to determine whether accretion or propeller occurs, or the region around the NS magnetic pole where the intense X-rays are supposed to be produced are specially appealing targets of study. For the LMXBs, the evolution the outburst and the properties of the compact objects themselves are obvious priority targets for Insight-HXMT. Due to the broad coverage in energy, Insight-HXMT is specially well suited to study the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environment.  
Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT 期刊论文  OAI收割
Astrophysics and Space Science, 2020, 卷号: 365, 页码: 158
作者:  HXMT
  |  收藏  |  浏览/下载：53/0  |  提交时间：2022/02/08
Insight-HXMT  Geant4 simulation  Background observation  Astrophysics  - Instrumentation and Methods for Astrophysics  Abstract: Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, in-orbit backgrounds of these three telescopes had been estimated through Geant4 simulation, in order to investigate the instrument performance and the achievement of scientific goals. In this work, these simulated backgrounds are compared with in-orbit observations. Good agreements are shown for all three telescopes. For HE, (1) the deviation of the simulated background rate after two years of operation in space is 5 % from the observation  (2) the total background spectrum and the relative abundance of the 67 keV line show long-term increases both in simulations and observations. For ME, (1) the deviation of simulated background rate is within 15 % from the observation, and (2) there are no obvious long-term increase features in the background spectra of simulations and observations. For LE, the background level given by simulations is also consistent with observations. The consistencies of these comparisons validate that the Insight-HXMT mass model, i.e., space environment components and models adopted, physics processes selected, and detector constructions built, is reasonable. However, the line features at 7.5 and 8.0 keV, which are obvious in the observed spectra of LE, are not evident in simulations. This might result from uncertainties in the LE constructions.