Model Atmospheres for Yellow Supergiants

Abstract

view Abstract Citations (71) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Model Atmospheres for Yellow Supergiants Parsons, Sidney B. Abstract A grid of fifteen non-gray models, designed to represent realistically the atmospheres of F- and early G-type supergiants, is computed for effective temperatures in the range 5400 600 K and for surface gravities log g (cm sec ) = 1.2,1.8, and 2.4. Ml aspects of the construction of the models are discussed in detail. The flux due to convection, significant in the deeper regions, is calculated from mixing4ength theory with a mixing length to pressure scale height ratio of 1.0 and a non4ocal calculation of the speeds of convective elements. The important line-blaaketing effect is included in the calculation of the radiative flux by a statistical treatment which allows variation of the estimated line absorption with depth. The temperature distributions are found to be sensitive to the way in which blanketing is included. Each model is iterated to near<:onstancy of total flux with modified Mihalas temperature-correction equations. Within the grid of models there is a transition from thin, atmospheric hydrogen convection zones to deep zones extending well below the atmospheres. Publication: The Astrophysical Journal Supplement Series Pub Date: June 1969 DOI: 10.1086/190187 Bibcode: 1969ApJS...18..127P full text sources ADS |