Astrophysics and Space Science

, Volume 47, Issue 1, pp 185–193 | Cite as

Origin of the diffuse interstellar absorption bands

III. Zero phonon lines in MgO and CaO
  • W. W. Duley


Evidence is presented that zero phonon lines of defect centres in MgO and CaO are responsible for the diffuse interstellar bands at 5362, 5705, 6425.7, and 6699.4 Å. Phonon sidebands of these lines are identified with the diffuse bands at 5535, 6177, 6196, 6284, and 6314 Å. These features arise in interstellar MgO and CaO particles with sizes ≳50 Å. Infrared spectral features due to interstellar MgO and CaO are discussed.


Absorption Band Spectral Feature Defect Centre Diffuse Band Phonon Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1977

Authors and Affiliations

  • W. W. Duley
    • 1
  1. 1.Physics DepartmentYork UniversityTorontoCanada

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