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Record Details

Record 66 of 21734
Hydrodynamic effects in the atmosphere of variable stars
Author and Affiliation:
Davis, C. G., Jr.(Los Alamos Scientific Lab., NM, United States)
Bunker, S. S.(Los Alamos Scientific Lab., NM, United States)
Abstract: Numerical models of variable stars are established, using a nonlinear radiative transfer coupled hydrodynamics code. The variable Eddington method of radiative transfer is used. Comparisons are for models of W Virginis, beta Doradus, and eta Aquilae. From these models it appears that shocks are formed in the atmospheres of classical Cepheids as well as W Virginis stars. In classical Cepheids, with periods from 7 to 10 days, the bumps occurring in the light and velocity curves appear as the result of a compression wave that reflects from the star's center. At the head of the outward going compression wave, shocks form in the atmosphere. Comparisons between the hydrodynamic motions in W Virginis and classical Cepheids are made. The strong shocks in W Virginis do not penetrate into the interior as do the compression waves formed in classical Cepheids. The shocks formed in W Virginis stars cause emission lines, while in classical Cepheids the shocks are weaker.
Publication Date: Jan 01, 1975
Document ID:
19760003868
(Acquired Nov 18, 1995)
Accession Number: 76N10956
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Publication Information: NASA. Goddard Space Flight Center Cepheid Modeling; p 71-83
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Los Alamos Scientific Lab.; NM, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: MATHEMATICAL MODELS; SHOCK WAVE PROPAGATION; STELLAR ATMOSPHERES; VARIABLE STARS; ASTRONOMICAL MODELS; CEPHEID VARIABLES; HYDRODYNAMICS; RADIATIVE TRANSFER
Imprint And Other Notes: In NASA. Goddard Space Flight Center Cepheid Modeling p 71-83 (SEE N76-10951 01-90)
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