Interpretation of the Large Variations in the Line Positions in SS433

摘要

The available data on the time variations of the wavelengths of the peculiar emission features in SS433 are studied. The main results are as follows: (a) the mean wavelength of the two lines ((lambda sub 1 +lambda sub 2 )/2) associated with H/sub alpha / is constant with time to a very good approximation; (b) the wavelength variation of each of the two lines, with respect to the fixed mean is described to a very good approximation by a function of the form d+bsin alpha , where alpha varies linearly with time. Models in which the tunable features are due to H/sub alpha / emission which comes from two regions, symmetrically situated about a central object with velocities equal in absolute value and opposite in sign, are considered. The wavelength shifts are due to longitudinal and transversal Doppler shifts and to gravitational red shift. The observed wavelength variations must be due to changes in the angle between the velocity vectors and the line of sight. The data are consistent with a constant rate of rotation of the line connecting the two regions. A few configurations which satisfy these constraints are discussed. (Atomindex citation 10:481289)