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The role of the CO 67-186 mu m lines in astrophysics
Mao, RQ; Zeng, Q; Chen, YF; Pei, CC; Miao, Y
AbstractA spherical and large-velocity-gradient model is adopted for the theoretical calculations of NGC 7027, AFGL 2688 and IRC+10216, whose emissions of CO far-infrared lines are comparatively strong. The statistical equilibrium calculations cover 107 energy levels. The upper energy limit is 4863 cm(-1) above the energy level with v = 0 and J = 0. There are altogether 107 energy levels with v = 0, J = 0 - 50; v = 1, J = 0 - 37 and v = 2, J = 0 - 17. The relative flux distributions of the CO lines, as functions of the upper rotational quantum number J, of the line, may be a good probe to examine the physical conditions of the region in which the CO line emissions arise. The CO far-infrared lines of IRC + 10216 are excited mainly by the central star, while for NGC 7027 and AFGL 2688 by the shocked warm and dense gases. The excitation mechanism is also discussed for other observed objects by using ISO. The CO spectra in the wavelength range 67-186 mu m are important probes for detecting objects with kinetic temperatures of several hundred degrees, i.e. the envelopes of carbon- or oxygen-rich stars, planetary nebulae, young stellar objects and star-forming complexes.
KeywordSpectral Line Formation Infrared Emission Circumstellar Envelope
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000087315900006
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
Recommended Citation
GB/T 7714
Mao, RQ,Zeng, Q,Chen, YF,et al. The role of the CO 67-186 mu m lines in astrophysics[J]. CHINESE ASTRONOMY AND ASTROPHYSICS,2000,24(2):185-190.
APA Mao, RQ,Zeng, Q,Chen, YF,Pei, CC,&Miao, Y.(2000).The role of the CO 67-186 mu m lines in astrophysics.CHINESE ASTRONOMY AND ASTROPHYSICS,24(2),185-190.
MLA Mao, RQ,et al."The role of the CO 67-186 mu m lines in astrophysics".CHINESE ASTRONOMY AND ASTROPHYSICS 24.2(2000):185-190.
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