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

Author: Melbourne, William Geary

Year: 1959

Degree: Dissertation (Ph.D.)

Advisor: Code, Arthur D.

Committee Member: Unknown, Unknown

Option: Astronomy; Physics

DOI: 10.7907/EJ3Z-2917

Abstract

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.

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