What is the total mass of a binary star system with P = 20 years and a = 10 AU? a. 2 solar masses b. 2.5 solar masses c. 0.5 solar mass d. 80 solar masses e. 0.4 solar mass
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| a. |
2 solar masses
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| b. |
2.5 solar masses
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| c. |
0.5 solar mass
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| d. |
80 solar masses
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| e. |
0.4 solar mass
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- Black holes are formed by A. collapsed dark nebulae. B. supernovae from binary stars. C. a lack of any light in a region of space. D. supernovae from the most massive stars.Solve the following problem: Two stars, named A and B, each with a mass equal to the Sun's mass are in orbit around each other. If the distance between the two stars is 1.0 AU. What is the period of their orbit? Describe each step in solving the problem:Which of the following is largest? the size of a typical star. 1 AU. the size of the earth. 1 light-minute.
- The average star spends what percentage of its life in the protostar stage? a. 0.1% b. 5% c. 10% d. 50% e. 90%Sn1604 a supernova in the year 2000 the age then was 396 years calculate the speed of expansion of the sn1604 Kepler’s supernova assuming it has expanded at a constant speed throughout its lifetimeThe Sun has a radius of 6.955×105 km and a mass of 1.989×1030 kg. What is the density of the Sun? Answer: ____ kg/m3 How does this compare to the density of Earth (5500 kg/m3)? Answer: ____ times the density of Earth
- Match the spectral type and luminosity class to theletters shown on the Hertzsprung-Russell diagram 1) A WD (White Dwarf)2) G V (Main Sequence) 3) M V (Main Sequence)4) M I (Supergiant)5) G III (Giant)15: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the distance to this star? Answer: 37 16: What is the absolute magnitude of this star? Answer:1.8 17: Is this star more or less luminous than the Sun? Answer "M" for More luminous or "L" for Less luminous. (HINT: the absolute magnitude of the Sun is 4.8) Answer: M 18: What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.) Please answer question #18, #15-17 are correct, the photos provide the work for them.This star has a mass of 3.3 MSun. What is the main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr.
- Hypernovae are thought to be a. a star greater than 20 solar masses collapsing into a black hole. b. binary systems involving mass transferred to a neutron star. c. binary systems involving mass transferred to a white dwarf. d. two main-sequence stars colliding. e. binary systems involving mass transferred to a black hole.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.