Lecture 6 - Spectroscopic and Eclipsing Binaries (1/28/99)

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Chapter 12 (ZG4)


pages 20 - 23

Artists conception of an X-ray binary star. The two stars are so close together that the larger star spills over onto the white dwarf companion, which gets heated and emits X-rays. (Courtesy NASA/STSCI)
? Key Question: How can you measure the radius of a distant star?
! Key Principle: Mass Function for Binary Stars
# Key Problem: Determine densities and radii of Sirius A & B.


  1. Spectroscopic Binaries
  2. Eclipsing Binaries
  3. Example (see homework 1): Sirius A & B - Radii and Densities

The Doppler Effect

The Doppler effect:

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smyers@nrao.edu Steven T. Myers