Citation
Norton, Robert Henry (1964) HeH+ in model stellar atmospheres. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd10082002163233
Abstract
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Approximate quantummechanical calculations for the two lowest '[Sigma][superscript +] states of the helium hydride molecule ion HeH[superscript +] have been made. The molecular potential energy curves resulting from these calculations have been found to agree reasonably well with the results of other investigators. Using classical statistics for the distribution of internuclear separations, approximate absorption coefficients for radiative transitions between these two states have been obtained.
A program to compute model stellar atmospheres in strict radiative equilibrium is described and was used to compute eight models with log g = 4.0 and effective temperatures between 9500[degrees]K and 30000[degrees]K. Total flux constant to within 1% was attained for these models excluding HeH[superscript +] as a source of opacity. When the final models were recomputed including the opacity of HeH[superscript +], radiative equilibrium was found to be destroyed by as much as 15%. Radiative equilibrium was reestablished for the model with T[subscript e] = 16000[degrees] K, and a comparison between this model with and without HeH[superscript +] is given.
It is found that HeH[superscript +] introduces a striking discontinuity in the continuous spectrum of the model at 1130 A; the ratio of the emergent monochromatic flux on the red side of the discontinuity to the flux on the violet side is 8.2 for the 16000[degrees]K model. It is concluded that the wings of the Lyman lines, except L[...], are probably weaker than previously supposed.
In addition, numerical quadrature formulae of high accuracy and efficiency are given for integrals of the SchwarzschildMilne type.
Item Type:  Thesis (Dissertation (Ph.D.)) 

Degree Grantor:  California Institute of Technology 
Division:  Physics, Mathematics and Astronomy 
Major Option:  Astronomy 
Thesis Availability:  Public (worldwide access) 
Research Advisor(s): 

Thesis Committee: 

Defense Date:  1 May 1964 
Record Number:  CaltechETD:etd10082002163233 
Persistent URL:  http://resolver.caltech.edu/CaltechETD:etd10082002163233 
Default Usage Policy:  No commercial reproduction, distribution, display or performance rights in this work are provided. 
ID Code:  3979 
Collection:  CaltechTHESIS 
Deposited By:  Imported from ETDdb 
Deposited On:  09 Oct 2002 
Last Modified:  26 Dec 2012 03:04 
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