PHYS 183 Lecture Notes - Lecture 24: Roche Lobe, Radiography, Accretion Disk
21 Apr 2018
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In regular stars, detect binary orbital motion from doppler shift of wavelengths of absorption lines. Moving away from you red shifted. Radial velocity twice as large half the mass. Apparent pulse period in binary system changes due to doppler shift. Can study binary motion with exquisite precision. Top of peaks longest period exactly away from you: vice versa is also true. This shape from keplers law slow then fast. You can determine velocity of the pulsar from change in period. Answer: a: at b, it is going the fastest to get the farthest from you, and thus away from you, must be a. Recall 4 different types: visual, astrometric, composite spectrum, eclipsing, 90 degrees maximal shift, sometimes star passes in front of other, 0 degrees would result in no shift, spectroscopic. Binaries can fall in more than one class. Also: close binaries: binaries where stars are o close, one (or both) are gravitationally distorted by the other.
