Accession Number : AD0700870

Title :   RADIATION-HYDRODYNAMIC PHENOMENA IN THE ATMOSPHERES OF LUMINOUS STARS,

Corporate Author : LOCKHEED MISSILES AND SPACE CO PALO ALTO CALIF LOCKHEED RESEARCH LAB

Personal Author(s) : Hillendahl,R. W.

Report Date : 11 AUG 1969

Pagination or Media Count : 3

Abstract : A physical mechanism which can result in the generation of extended stellar atmospheres is discussed. The process involves the unloading of stellar material following the arrival of a shock wave at the edge of a star. A non-gray transport type radiaton-hydrodynamics code was used to obtain quantitative results for a cepheid atmosphere. The computed line profiles compare favorably with those observed for supergiants. The unloading mechanism provides an explanation for the low pressure gradient (low g) in supergiant atmospheres and illustrates the importance of hydrodynamic flow in determining the temperature and density profiles in the atmospheres of luminous stars. The additional acceleration occurring in the process provides a suggested mechanism for mass loss. (Author)

Descriptors :   (*STARS, HYDRODYNAMICS), MODELS(SIMULATIONS), SHOCK WAVES, DENSITY, TEMPERATURE, LINE SPECTRA

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE