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Dust Extinction and Elemental Abundances of NGC 7027

Published online by Cambridge University Press:  26 May 2016

Y. Zhang ,
X.-W. Liu  and
S.-G. Luo
Y. Zhang
Affiliation:
1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PRC
X.-W. Liu
Affiliation:
2 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
S.-G. Luo
Affiliation:
3 Department of Astronomy, Peking University, Beijing 100871, PRC

Extract

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Extinction toward NGC 7027 has been extensively studied. Seaton (1979) found the extinction across the nebula is variable and presented a two-component model to explain the radio and infrared observations. Middlemass (1990) presented a wedge-shaped extinction model, assuming the extinction increases linearly across the surface of the nebula. Walton et al. (1988) obtained an extinction map and found a mean extinction of EB-V = 1.02, and a lower extinction of EB-V = 0.8 towards the central star (CS). Based on high-resolution imaging, Robberto et al. (1993) and Wolff et al. (2000) obtained higher extinction of EB-V = 1.07 and 1.10 towards the CS, respectively.

Type
Part V: Dust and Molecules in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 319 - 320
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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