Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........43m&link_type=abstract
PhD Dissertation, Florida Univ. Gainesville, FL United States
Other
Rotation, Binary Data, Continuous Spectra, Light Curve, Mass Transfer, Algol, Binary Stars, Line Spectra, Spectral Line Width, Ellipsoids, Damping, Statistical Distributions
Scientific paper
Rotational velocities of stars normally are determined from spectral line widths by means of a calibration of width versus v sin i from suitable standards. Over the last few years, it has been possible to extract rotation rates from light curves of binary systems. The light curve model has been mainly used to compute theoretical light curves, which is to say that it deals mainly with continuum radiation rather than line radiation. However, the model can be used to predict the behavior of absorption lines. The dissertation consists of modelling and fitting line profiles generated by a program that includes the main local broadening mechanisms (damping, thermal, rotational and microturbulent broadening, etc.) and binary star effects (gravity and limb darkening, ellipsoidal variation, rotational distortion, etc.). Previous estimates of rotation from line profiles assumed that all or most other broadening effects are negligible compared to rotational broadening. This means that the previous methods are at their best for fast rotators and at their worst for slow rotators. However, it is for the slow and moderate rotators that information is most needed, because light curves are beginning to provide rotation rates for the fastest rotators, and the light curve method is best for fast rotation. Knowledge of rotation rates of mass transferring binaries will be useful in gathering information on mass transfer rates and the general mass transfer process and hence on the nature of close binary star evolution. It will also help us ascertain how well rotational velocities can be determined from light curves. Finally, it will help us establish the statistical distributions of Algol rotations, including how many systems are close to, or in, double contact (both components filling up their limiting lobes, one Roche and the other rotational).
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