The HII Region W40 and its Molecular Cloud

  • Richard M. Crutcher
  • You-Hua Chu
Part of the Astrophysics and Space Science Library book series (ASSL, volume 93)


Extensive new and published older observations of the HII region W40 and its associated molecular cloud have been analyzed. The HII region is near the center of an extensive dark cloud which is contracting at 3 km/s along the line of sight. The HII region is adjacent to the high-density, warm core of the molecular cloud and is responsible for heating it. The ionized hydrogen is expanding away from the high-density molecular gas at velocities up to 8 km/s and is just beginning to break through holes in the near side of the dark cloud.


Molecular Cloud Ionize Hydrogen Recombination Line Bright Star Dark Cloud 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Crutcher, R.M.: 1977, Astrophys. J. 216, 308.ADSCrossRefGoogle Scholar
  2. Crutcher, R.M.: 1979, Astrophys. J. 234, 881.ADSCrossRefGoogle Scholar
  3. Dickman, R.L.: 1978, Astrophys. J. Suppl. 37, 407.ADSCrossRefGoogle Scholar
  4. Goldsmith, P.F. and Langer, W.D.: 1978, Astrophys. J. 222, 881.ADSCrossRefGoogle Scholar
  5. Goss, W.M. and Shaver, P.A.: 1970, Australian J. Phys. Astrophys. Suppl. 14, 1.ADSGoogle Scholar
  6. Pankonin, V., Thomasson, P. and Barsuhn, J.: 1977, Astron. Astrophys. 54, 335.ADSGoogle Scholar
  7. Zeilik, M. and Lada, C.J.: 1978, Astrophys. J. 222, 896.ADSCrossRefGoogle Scholar

Copyright information

© D. Reidel Publishing Company 1982

Authors and Affiliations

  • Richard M. Crutcher
    • 1
  • You-Hua Chu
    • 2
  1. 1.University of IllinoisUSA
  2. 2.University of California, BerkeleyUSA

Personalised recommendations