Observations of the excited hydrogen radio line H56α in several H II regions

  • J. J. Berulis
  • G. T. Smirnov
  • R. L. Sorochenko
Part V: Large-Scale Distribution of H II Regions
Part of the Lecture Notes in Physics book series (LNP, volume 42)


Measurements of the excited hydrogen radio line H56a have been carried out in Orion A, W3, W12, W51 and DR 21. The electron temperatures obtained are lower than those deduced from the non-LTE analysis of observations at longer wavelengths. For the Orion nebula, detailed consideration gives Te = 7000 – 7300 K.


Electron Temperature Local Thermodynamic Equilibrium Antenna Temperature Atmospheric Extinction Radio Line 


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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • J. J. Berulis
    • 1
  • G. T. Smirnov
    • 1
  • R. L. Sorochenko
    • 1
  1. 1.Lebedev Physical InstituteMoscowUSSR

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