Group Title: analysis of the Rossiter effect in algol-type eclipsing binary systems
Title: An Analysis of the Rossiter effect in algol-type eclipsing binary systems
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 Material Information
Title: An Analysis of the Rossiter effect in algol-type eclipsing binary systems
Physical Description: viii, 207 leaves : ill. ; 28 cm.
Language: English
Creator: Twigg, Laurence William, 1951- ( Dissertant )
Wilson, Robert E. ( Thesis advisor )
Wond, Frank B. ( Reviewer )
Devinney, Edward J. ( Reviewer )
Oliver, John P. ( Reviewer )
Campbell, Hugh D. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1979
Copyright Date: 1979
Subjects / Keywords: Eclipsing binaries   ( lcsh )
Astronomy thesis Ph. D   ( lcsh )
Stars -- Rotation   ( lcsh )
Dissertations, Academic -- Astronomy -- UF   ( lcsh )
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
theses   ( marcgt )
Abstract: One of the fundamental parameters of a star is its rate of axial rotation. This parameter affects both the shape of the star and the distribution of light over the stellar surface. Thus, an accurate analysis of the light curve of an eclipsing binary system should include the effects of stellar rotation. In addition, the values of fundamental astrcphysical parameters such as mass, radius, and luminosity are usually found by combining the results of both photometric and spectroscopic analyses of an eclipsing binary system. Therefore, the correct treatment of stellar rotation (thus yielding a more accurate light curve solution) is necessary to ensure an accurate determination of the aforementioned fundamental parameters. To date, the primary means of determining the rate of stellar equatorial rotational velocities (V' q ) has been through an analysis of spectral line profiles. This type of analysis is limited both statistics (through the determination of V for standard stars) and instrumental iv (in that the error of the V derived for the system under analysis is approximately equal to the reciprocal dispersion cf the spectroscopic equipment used). Thus, one would like to find a second, independent method for determining V , which could be compared and contrasted with the value found from line profiles. Such an independent method of determining V for a component of an eclipsing binary system is available through the analysis of a spectroscopic phenomenon known as the Rossiter effect. The Rossiter effect is characterized by (sometimes very large) deviations in the radial velocity curve during the partial phases of an eclipse. These deviations are in a positive (red-shifted) sense during ingress, and a negative (blue-shifted) sense during egress. These deviations occur because, during these phases, the geometrical covering of part of the star being eclipsed leads to a doppler shift of the spectral lines of this star arising from axial rotation, as opposed to orbital motion. The present investigation uses such an analysis of this effect in order to determine V for che primary components of 19 Algol -type eclipsing binary systems. In addition, new analyses of the associated light curves and determination of new absolute parameters were carried out for these systems. Further, the radii of possible ring structures existing around the primary components in several systems were determined. Finally, evidence is presented indicating that for several suspect systems no extra light is present at second and third contact, unlike the results of an analysis of Y Psc by Walter. It is suggested that the inclusion in this study of rotation effects on the stellar figures removes the need for such extra light.
Statement of Responsibility: by Laurence William Twigg.
Thesis: Thesis--University of Florida.
Bibliography: Bibliography: leaves 202-205.
General Note: Typescript.
General Note: Vita.
 Record Information
Bibliographic ID: UF00099116
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000097416
oclc - 06560929
notis - AAL2855


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