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- The white dwarf that remains when our Sun dies will be mostly made of A. helium. B. carbon. C. neutrons. D. hydrogen. Is the answer B? Thanks!An eclipsing binary will a. be more luminous than a visual binary. b. always be a spectroscopic binary. c. give off most of its light in the infrared. d. show a constant Doppler shift in its spectral lines. e. show two stars with variable proper motion.1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.
- Match each statement with the appropriate item (If the first corresponds to B and the next 4 to C, enter BCCCC) 1) stars that have evolved off the main sequence and are growing in luminosity due to a hydrogen burning shell 2) young, spread out star cluster 3) cooler stars in a cluster that have not yet evolved off the main sequence 4) stars that are burning helium in their core 5) old, dense star cluster A. red-giant branch B. open cluster C. lower main sequence D. horizontal branch stars E. globular clusterList the following 5 terms in order through a stars life cycle (starting with the sun), through the remainder of its lifetime: a. Black dwarf b. Planetary nebula c. Red giant d. Star (Sun) e. White dwarfThe star Procyon A has an apparent magnitude of 0.38 and an absolute magnitude of 2.66 while the star Ross 128 has an apparent magnitude of 11.1 and an absolute magnitude of 13.5. Which star emits more energy? A. Procyon A O B. Ross 128 O C. They emit pretty much the same energy. D. There is insufficient information to tell.
- How can we know that the sun will “die” in about 5 billion years? Choose the correct answer. A. We can see the evolution and death in the spectra B. We can see the entire process as it plays out in a star C. We look at thousands of stars like the sun and can see them in all stages of developmentWhich of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, etc.) in a high- mass star is not true? A. As each stage ends, the core shrinks and heats further. B. Each successive stage creates an element with a higher atomic number and atomic mass number. C. As each stage ends, the reactions that occurred in previous stages continue in shells around the core. D.Each successive stage lasts for approximately the same amount of time.What is the lifetime of a 10-solar-mass star on the main sequence? a. 3.2 × 107 years b. 320 years c. 3.2 × 1012 years d. 1 × 109 years e. 1 × 1011 years