Ultraviolet photometry from the orbiting astronomical observatory. XXVII - Interpretation of the light curve of RR Lyrae
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Hutchinson, J. L.↗
Engineering topics
Hill, S. J.
Publications and source records attributed to Hill, S. J..
Interpretation of OAO-2 ultraviolet light curves of beta Doradus
Middle-ultraviolet light curves of beta Doradus, obtained by OAO-2, are presented along with other evidence indicating that the small additional bumps observed on the rising branches of these curves have their origin in shock-wave phenomena in the upper atmosphere of this classical Cepheid. A simple piston-driven spherical hydrodynamic model of the atmosphere is developed to explain the bumps, and the calculations are compared with observations. The model is found to be consistent with the shapes of the light curves as well as with measurements of the H-alpha radial velocities.
Hutchinson, J. L.↗
Shock waves in a beta Doradus model
The accumulation of observational evidence and interpretation supports the conclusion that beta Doradus has running shock waves in its atmosphere. It is the work by Hutchinson with its predictions for the phases of the shock waves that prompted this author to construct a numerical hydrodynamical model for the atmosphere of beta Doradus. A short description of the procedure of the calculation follows. The results for the beta Doradus model contain a comparison with the observations. It is of particular interest to verify that the atmosphere contains multiple shock waves as suggested by Hutchinson for the ultraviolet observations.
Hill, S. J.↗