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Exploration of SDSS stellar database by AutoClass
Yan TaiSheng1,2; Zhang YanXia1; Zhao YongHeng1; Li Ji2
2011-09-01
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume54Issue:9Pages:1717-1726
AbstractAutoClass is an unsupervised Bayesian classification approach which seeks a maximum posterior probability classification for determining the optimal classes in large data sets. Using stellar photometric data from the Sloan Digital Sky Survey (SDSS) data release 7 (DR7), we utilize AutoClass to select non-stellar objects from this sample in order to build a pure stellar sample. For this purpose, the differences between PSF (point spread function) magnitudes and model magnitudes in five wavebands are taken as the input of AutoClass. Through clustering analysis of this sample by AutoClass, 617 non-stellar candidates are found. These candidates are identified by NED and SIMBAD databases. Most of the identified sources (13 from SIMBAD and 28 from NED respectively) are extragalactic sources (e.g., galaxies, HII, radio sources, infrared sources), some are peculiar stars (e.g., supernovas), and very few are normal stars. The extragalactic sources and peculiar stars of the identified objects occupy 94.1%. The result indicates that this method is an effective and robust clustering algorithm to find non-stellar objects and peculiar stars from the total stellar sample.
KeywordData Analysis Statistical Method Catalogues Surveys Star
DOI10.1007/s11433-011-4425-7
Indexed BySCI
Language英语
WOS IDWOS:000293797100022
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8042
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
2.Hebei Normal Univ, Coll Phys Sci & Informat Engn, Shijiazhuang 050016, Peoples R China
Recommended Citation
GB/T 7714
Yan TaiSheng,Zhang YanXia,Zhao YongHeng,et al. Exploration of SDSS stellar database by AutoClass[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2011,54(9):1717-1726.
APA Yan TaiSheng,Zhang YanXia,Zhao YongHeng,&Li Ji.(2011).Exploration of SDSS stellar database by AutoClass.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,54(9),1717-1726.
MLA Yan TaiSheng,et al."Exploration of SDSS stellar database by AutoClass".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 54.9(2011):1717-1726.
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