Suppose you find a binary star system in which the more massive star is a red...
Suppose you find a binary star system in which the more massive star is a red giant and the less massive star is a main-sequence star. Would you expect that mass transfer between the stars has played an important role in the evolution of these stars? Explain your reasoning.
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Suppose you find a binary star system in which the more massive
star is a red...
30. Why are the Balmer lines in the spectra of giant stars narrower than those for...
30. Why are the Balmer lines in the spectra of giant stars narrower than those for main-sequence stars? 31. Binary stars are [common, very rare]. 32. Binary stars allow us to determine what very important property of stars? 33. In a binary system the center of mass lies closer to the [more massive, less massive] star. 34. What type of star is Sirius B? [main sequence, white dwarf, giant] 35. Why does a spectroscopic binary system only allow us to...
123 Binary Stars 7) Imagine that you are watching a binary star system chtas they eaomntar....
123 Binary Stars 7) Imagine that you are watching a binary star system chtas they eaomntar. And I type main sequence star and a B-spectral type main sequence sta orbit. During this time, you are able to see the starst of the M-S mvedstars At another time, you see the B-spectral type star in at an entirely different time, you see that the B-spectretches showing M-spectral type star. In the space below, draw three would look like at the three...
Which of the following statements about red giant stars are true? (Select all that apply.) Red...
Which of the following statements about red giant stars are true? (Select all that apply.) Red giant stars are less luminous than main sequence stars of the same temperature. Red giant stars tend to be more luminous than main sequence stars of the same temperatures because they are larger in size. Red giant stars are less luminous than main sequence stars because fusion happens more rapidly in main sequence stars. A red giant star of a given temperature is more...
The bright red star Antares is actually a binary star system, its components are named a...
The bright red star Antares is actually a binary star system, its components are named a Scorpii A and a Scorpii B respectively. Assuming that the separation between the two stars are 529 AU, and they rotate around each other with a period ranging between 880 to 2562 years, calculate the range of the total mass for the Antares system in M. using the modified version of Kepler's Third Law. State what further observation is required to find the individual...
5. The HR Diagram. Suppose we consider a main sequence “O star” much more massive than...
5. The HR Diagram. Suppose we consider a main sequence “O star” much more massive than the sun. According to the formulae shown in lecture: a. What is the luminosity of a main-sequence O star (in solar units, Lsun) of mass 100 solar masses? b. If the sun were a 100 solar mass main-sequence O star, how much brighter would it appear from the earth? c. What is the hydrogen fusing lifetime of this star in years? d. If the...
What is the reason for two stars to have the same brightness but one being 100...
What is the reason for two stars to have the same brightness but one being 100 times more luminous than the other? One of them is 100 times more distant One of them is 10 times more distant One of them is 1000 times more distant One of them is 4π times more distant The Brightness scale like the inverse of the square of the distance (1/R2) T F What is parallax? The distance of a star A method to...
5) A star (no matter what its mass) spends most of its life Select one: a....
5) A star (no matter what its mass) spends most of its life Select one: a. as a protostar. b. as a main-sequence star. c. as a planetary nebula. d. as a red giant or supergiant. 6) What is the ultimate fate of an isolated white dwarf? Select one: a. It will cool down and become a cold black dwarf. b. As gravity overwhelms the electron degeneracy pressure, it will explode as a nova. c. As gravity overwhelms the electron...
Problem 7 (FC 7.12). The binary star system Cygnus X-1 consists of a main sequence star...
Problem 7 (FC 7.12). The binary star system Cygnus X-1 consists of a main sequence star of mass 20 Mo and a black hole of mass 16 Mo, where M.: 1.99 × 1030 kg is the mass of the sun. If its mutual rotation period is 5.6 days, find the mean distance between them.
A 100 MꙨ (i.e 100 times the mass of the Sun) main-sequence star is close to...
A 100 MꙨ (i.e 100 times the mass of the Sun) main-sequence star is close to its Eddington limit, is powered by the CNO cycle, and has a central temperature of 3x10^7 K. How massive must a star be before it can begin burning He while still on the main sequence? From this, estimate how many such stars (if any) you might expect to find in the Milky Way.
A binary star system has two stars, each with the same mass as our sun, separated...
A binary star system has two stars, each with the same mass as our sun, separated by 1.50×1012 m . A comet is very far away and essentially at rest. Slowly but surely, gravity pulls the comet toward the stars. Suppose the comet travels along a straight line that passes through the midpoint between the two stars. What is the speed at the comet's midpoint?
123 Binary Stars 7) Imagine that you are watching a binary star system chtas they eaomntar. And I type main sequence star and a B-spectral type main sequence sta orbit. During this time, you are able to see the starst of the M-S mvedstars At another time, you see the B-spectral type star in at an entirely different time, you see that the B-spectretches showing M-spectral type star. In the space below, draw three would look like at the three...
The bright red star Antares is actually a binary star system, its components are named a Scorpii A and a Scorpii B respectively. Assuming that the separation between the two stars are 529 AU, and they rotate around each other with a period ranging between 880 to 2562 years, calculate the range of the total mass for the Antares system in M. using the modified version of Kepler's Third Law. State what further observation is required to find the individual...
Problem 7 (FC 7.12). The binary star system Cygnus X-1 consists of a main sequence star of mass 20 Mo and a black hole of mass 16 Mo, where M.: 1.99 × 1030 kg is the mass of the sun. If its mutual rotation period is 5.6 days, find the mean distance between them.
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