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Line Blanketing Effects on Middle-Type Main-Sequence and Sub-Dwarf Stars


Melbourne, William Geary (1959) Line Blanketing Effects on Middle-Type Main-Sequence and Sub-Dwarf Stars. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/EJ3Z-2917.


The subject of line blanketing and its effect on the continuous radiation and measured colors of stars is reviewed. Observed energy distributions which have been corrected for blanketing are compared with theoretical flux distributions derived from model atmospheres. Reasonable agreement is found and the comparisons serve to establish a set of effective temperatures for the stars under study. The UBV colors of the program stars are computed from observed energy distributions and the results are compared with the observed colors. The theoretical colors are also obtained. The effects of line blanketing with and without the hydrogen lines on the UBV colors are quantitatively assessed. A three dimensional (U-B) -- (B-V) -- effective temperature relationship is discussed. The above analysis leads to line-free UBV and color-magnitude main-sequence relationships.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Astronomy and Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Astronomy
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Code, Arthur D.
Group:Astronomy Department
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1959
Record Number:CaltechETD:etd-02172006-090057
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:654
Deposited By: Imported from ETD-db
Deposited On:17 Feb 2006
Last Modified:18 Oct 2023 22:14

Thesis Files

PDF (Melbourne_wg_1959.pdf) - Final Version
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