Quiz Answer Key and Fun Facts
1. What is a binary system?
2. Which of these is NOT a type of binary system?
3. A visual binary is one in which the binary system can be seen as two separate points of light. Which instrument is most useful when determining a visual binary?
4. While Sirius can now be studied as a visual binary, this was not always the case.
5. Spectroscopic binaries are revealed thru spectral analysis, as the name suggests. Two spectra are exhibited (although sometimes only one spectrum can be observed) and the shift of the spectral lines toward either red or blue tells us whether the stars are moving toward or away from the observer. What are these distinctive frequency shifts called?
6. For eclipsing (photometric) binaries, using the eclipse information can yield the radii of the two stars, despite the system appearing as a single star.
7. Which of these is a quadruple binary system, consisting of a visual binary, of which each of the stars is itself a spectroscopic binary?
8. The mass of a star (stellar mass) can only be investigated for stars of binary systems. If the mass is known, the radius and luminosity can be worked out. Which of these answers correctly states both the mass-radius and mass-luminosity relationships?
(prop) means here "is proportional to", and "lum" stands for "luminosity".
9. In some binary systems, the mass of one star can be transferred to and accumulate on the surface of the companion. When the mass builds up to a certain limit, the star can explode in a nova or even a Type 1a supernova. Which type of star would the companion be to allow for these explosions?
10. Final question: Can a member of a binary system be a black hole?
Source: Author reeshy
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