SPECTRA

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Chemical abundances of three new Ba stars from the Keck/HIRES spectra
《Research in Astronomy and Astrophysics》2021年第11期67-78,共12页Shuai Liu Liang Wang Jian-Rong Shi Zhen-Yu Wu Hong-Liang Yan Qi Gao Chun-Qian Li 
supported by the National Key R&D Program of China (No. 2019YFA0405502);the National Natural Science Foundation of China (Grant Nos. 12090040, 12090044, 11833006, 12022304, 11973052, 11973042, U2031144 and U1931102);supported by the Astronomical Big Data Joint Research Center, co-founded by the National Astronomical Observatories, Chinese Academy of Sciences (CAS);support from the Youth Innovation Promotion Association of the CAS (id. 2019060)
Based on high resolution,high signal-to-noise(S/N)ratio spectra from Keck/HIRES,we have determined abundances of 20 elements for 18 Ba candidates.The parameter space of these stars is in the range of 4880≤Teff≤6050 ...
关键词：GALAXY Ba stars Chemical abundances Binary 
The first data release of LAMOST low-resolution single-epoch spectra被引量：1
《Research in Astronomy and Astrophysics》2021年第10期73-85,共13页Zhong-Rui Bai Hao-Tong Zhang Hai-Long Yuan Dong-Wei Fan Bo-Liang He Ya-Juan Lei Yi-Qiao Dong Si-Cheng Yu Yong-Heng Zhao Yong Zhang Yong-Hui Hou Yao-Quan Chu 
support of the National Key R&D Program of China(2019YFA0405000);the National Natural Science Foundation of China(NSFC)(Grant Nos.12090040 and 12090041);the support of NSFC(Grant No.11973054);the support of the Youth Innovation Promotion Association of Chinese Academy of Sciences(id.2020060);supported by Cultivation Project for LAMOST Scientific Payoff;Research Achievement of CAMS-CAS;Funding for the project has been provided by the National Development and Reform Commission。
LAMOST Data Release 5,covering 17000 deg^(2) from-10°to 80°in declination,contains 9 million co-added low-resolution spectra of celestial objects,each spectrum combined from repeat exposure of two to tens of times d...
关键词：surveys stars:general methods:data analysis 
Analysis of the X-ray emission from OB stars Ⅲ: low-resolution spectra of OB stars
《Research in Astronomy and Astrophysics》2020年第7期161-171,共11页Elizaveta Ryspaeva Alexander Kholtygin 
support from the Russian Science Foundation grant(No.18–12–00423)。
This paper is the third in our series of papers devoted to the investigation of X-ray emission from OB stars.In our two previous papers,we study the high-resolution X-ray spectra of 32 O stars and 25 B stars to invest...
关键词：stars:early-type stars:spectra:X-Ray 
Analysis of the X-ray emission of OB stars II: B stars
《Research in Astronomy and Astrophysics》2019年第8期143-150,共8页Elizaveta Ryspaeva Alexander Kholtygin 
support from the Russian Science Foundation project (No. 18-12-00423)
This paper is the second part of an investigation into the mechanism for the origin of X-rays in early-type stars. Archival X-ray observations of 25 B stars, obtained by the XMM-Newton satellite, are analysed. We chec...
关键词：stars:early-type stars:spectra:X-ray 
Analysis of the X-ray emission of OB stars:O stars
《Research in Astronomy and Astrophysics》2018年第8期121-134,共14页Elizaveta Ryspaeva Alexander Kholtygin 
support from the Russian Science Foundation project No.18-12-00423;RFBR grant 18-02-00554
We investigate the global properties of X-ray emission from O stars, analyzing the X-ray spec- tra of 32 O stars from archival data of the XMM-Newton space observatory. We examine two hypotheses about of the origin of...
关键词：STARS early-type - stars SPECTRA X-RAY 
A Monte Carlo study of the spectra from inhomogeneous accretion flow
《Research in Astronomy and Astrophysics》2017年第8期101-108,共8页Xiao-Di Yu Ya-Ping Li Fu-Guo Xie Ren-Yi Mai 
supported by the National Natural Science Foundation of China under grants 11333004, 11133005, 11573051 and U1531130;the Fundamental Research Funds for the Central Universities under grant 20720150032;supported in part by the Youth Innovation Promotion Association of CAS (id. 2016243);the National Basic Research Program of China (973 Program, grant 2014CB845800);the Strategic Priority Research Program ‘The Emergence of Cosmological Structures’ of CAS (grant XDB09000000);the CAS/SAFEA International Partnership Program for Creative Research Teams;the Natural Science Foundation of Shanghai (grant 17ZR1435800);sponsored in part by Shanghai Sailing Program (No. 17YF1422600)
A model of an inhomogeneous accretion flow,in which cold clumps are surrounded by hot gas or corona,has been proposed to explain the spectral features of black hole X-ray binaries.In this work,we try to find possible ...
关键词：ACCRETION accretion disks—X-rays binaries—stars black holes 
A method of measuring the [α/Fe] ratios from the spectra of the LAMOST survey被引量：1
《Research in Astronomy and Astrophysics》2016年第7期83-96,共14页Ji Li Chen Han Mao-Sheng Xiang Jian-Rong Shi Jing-Kun Zhao Xiao-Wei Liu Hua-Wei Zhang Hai-Bo Yuan Xuan Ci Xiao-Feng Zhang Yue-Xiang Wang Yang Huang Yong Zhang Yong-Hui Hou Yue-Fei Wang Zi-Huang Cao 
supported by the National Key Basic Research Program of China(973Program,No.2014CB845700);the National Natural Science Foundation of China(Grant Nos.U1331120,U1431106,U1531118,U1531244 and 11473001);The Guo Shou Jing Telescope(the Large Sky Area MultiObject Fiber Spectroscopic Telescope,LAMOST)is aNational Major Scientific Project built by the Chinese Academy of Sciences;provided by the National Development and Reform Commission.LAMOST is operated and managed by National Astronomical Observatories,Chinese Academy of Sciences
The [α/Fe] ratios in stars are good tracers to probe the formation history of stellar populations and the chemical evolution of the Galaxy. The spectroscopic survey of LAMOST provides a good opportunity to determine ...
关键词：GALAXY evolution stars abundances stars fundamental parameters techniques spectroscopy surveys methods data analysis 
Spectral classification of stars based on LAMOST spectra被引量：9
《Research in Astronomy and Astrophysics》2015年第8期1137-1153,共17页Chao Liu Wen-Yuan Cui Bo Zhang Jun-Chen Wan Li-Cai Deng Yong-Hui Hou Yue-Fei Wang Ming Yang Yong Zhang 
supported by the Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences (Grant No. XDB09000000);the National Key Basic Research Program of China (2014CB845700);CL acknowledges the National Natural Science Foundation of China (NSFC, Grant Nos. 11373032, 11333003 and U1231119)
In this work, we select spectra of stars with high signal-to-noise ratio from LAMOST data and map their MK classes to the spectral features. The equivalent widths of prominent spectral lines, which play a similar role...
关键词：techniques： spectroscopic—stars： general—stars： fundamental parameters—stars： statistics—Galaxy： stellar contents 
Classification of Spectra of Emission Line Stars Using Machine Learning Techniques
《International Journal of Automation and computing》2014年第3期265-273,共9页Pavla Bromová Petr koda Jaroslav Vázn 
supported by Czech Science Foundation(No.GACR13-08195S);the project Central Register of Research Intentions CEZMSM0021630528 Security-oriented Research in Information Technology,the specific research(No.FIT-S-11-2);the project RVO:67985815;the Technological agency of the Czech Republic(TACR)project V3C(No.TE01020415);Grant Agency of the Czech Republic-GACR P103/13/08195S
Advances in the technology of astronomical spectra acquisition have resulted in an enormous amount of data available in world-wide telescope archives. It is no longer feasible to analyze them using classical approache...
关键词：Be star stellar spectrum feature extraction dimension reduction discrete wavelet transform CLASSIFICATION support vector machines(SVM) clustering. 
Metallicity calibration for solar type stars based on red spectra
《Research in Astronomy and Astrophysics》2011年第5期563-576,共14页Jing-KunZhao GangZhao Yu-QinChen A-LiLuo 
supported by the National Natural Science Foundation of China under grant Nos. 10673015,10821061,10973021,11078019,11073026;the National Basic Research Program of China(973 program) No. 2007CB815103/815403;the Academy program No.2006AA01A120;the Youth Foundation of the National Astronomical Observatories of China
Based on a high resolution and high signal-to-noise ratio （S/N） spectral analysis of 90 solar-type stars, we have established several new metaUicity calibrations in the Tefr range [5600, 6500] K based on red spectra...
关键词：techniques： radial velocities - stars： temperatures - stars： abundances 
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