star A and star B are both on the main sequence. star A is 56 times more luminous than star B. what is the ratio of their main-sequence lifetimes? refer to the stellar life expectancies equation

Q: Star A and Star B are both on the main sequence. Star A is 74 times more luminous than Star B. What…

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Q: With a pair of binoculars, the faintest stars that you can see have an apparent magnitude of…

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Q: All stars start their lives with the same basic composition. What determines their differences? O…

A: Mass they formed with

Q: In a binary star system, the average separation between the stars is 4.0 AU, and their orbital…

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Q: of a star occur

A: Possible stages of a star that occurs are as follows:

Q: Suppose a star has the same luminosity as our Sun (3.8x1026watts3.8x1026watts) but is located at a…

A: as per our guidelines, we can answer only first question. please resubmit rest questions for…

Q: The mass-luminosity relation describes the mathematical relationship between luminosity and mass for…

A: L/Lo = (M/Mo )3.5  here the luminosity is to be found in terms of Lo  M = 4Mo

Q: Which stars are associated with a planetary nebula? black holes, neutron star's, white dwarf or main…

A: Required : What are planetary nebula associated with.

Q: This star has a mass of 3.3 MSun. What is the main sequence lifetime of this star? You may assume…

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Q: What are the approximate spectral type, temperature, absolute magnitude number, and luminosity of…

A: Required :  Spectral type, absolute magnitude, temperature and luminosity of star E.

Q: For each type of stellar explosion, identify its progenitor star

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Q: What is the life expectancy of a 2-solar-mass star?

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Q: What is the life expectancy (in years of a 19M main-sequence Star? What is the life expectancy (in…

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Q: Describe the forces acting on a star during the main sequence period of its life?

A: A star has its gravity, and due to the hot core of a star, it creates pressure within the gas. Two…

Q: Calculate the luminosity of an 8 solar mass star.

A: The luminosity of a star is the amount of energy that it radiates per second. It can be considered…

Q: What size star is the sun? O supergiant O medium O giant O white dwarf

A: The sun size is about 696340 km in radius and it's mass is 1.989*10^30 kg.

Q: When two stars are in the same star system, they can affect each other’s evolution. Two stars in the…

A: Two stars in the same system might evolve at a different pace, depending on their distances in the…

Q: White dwarfs have a temperature of 100×103 K. Calculate the maximum wavelength of a White dwarf.

A: A white dwarf is a stellar core remnant that is highly dense and made of electron-degenerate matter.…

Q: The stars in a binary system are a 4 MO main sequence star and a 1 MO red giant. Explain why this…

A: A binary star system is formed when two stars come close enough to form an orbit around its…

Q: Globular clusters contain no stars more massive than the Sun. Which of the following seems like the…

A: First, we are aware that no stars more massive than the Sun can be found in globular clusters. Any…

Q: What are the two main nuclear chains known in stars and what are they responsible for? What are the…

A: To explain the above question is given as, There are two main reactions in the nuclear chain in…

Q: Main sequence star A is 5 times as massive as main sequence star B. How do the main sequence…

A: Main sequence stars are those which fuse hydrogen atoms in their core to form helium. They have a…

Q: Consider two stars on the main sequence, A and B. Star A has a mass of 9. Мо Star B has a mass of…

A: Solution attached in the photo

Q: Consider three main sequence stars: Star A is 12000 K, Star B is 6000 K, Star C is 3000 K. What are…

A: Given, Star A = 12000 K temprature  Star B = 6000 K temprature  Star C = 3000 K temprature   So the…

Q: What is the mass of a star with a main-sequence lifetime of 4 billion years? 17 X solar masses

A: According to stellar theories & observations the average lifetime of main-sequence stars has…

Q: Describe what would happen to the luminosity of a star if its temperature doubles and its radius…

A: Luminosity of a star depends on both temperature and radius.  L ∝ R2 T4

Q: Draw an H-R diagram and dot the following question options on the diagram (using the letters given…

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Q: In every nebula, a star is beginning to form. a) True b) False

A: True or False: In every nebula, a star is beginning to form.

Q: On a H-R diagram for main sequence stars, as temperature increases, brightness usually increases…

A: Required: Variation of brighness with  temperature in HR diagram.

Q: Star size in term of the sun. Wien’s Law: max = 2.98 X 106 / T The value of T is in Kelvin.…

A: The  stellar radius of the sun is, Rs=kLθTs2   The expression for the stellar radius of the given…

Q: Use the Luminosity Distance Formula. Find the distance to a star (L=2.2x1026 watts) whose apparent…

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Q: Star A and Star B are both on the main sequence. Star A is 63 times more luminous than Star B. What…

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Q: You've just discovered a new X-ray binary, which we will call Hyp-X1 ("Hyp" for hypothetical). The…

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Q: Stars found on the main sequence of a Hertzsprung-Russell diagram share certain features not shared…

A: The correct answer is:(e) Stars on the main sequence of a Hertzsprung-Russell diagram all generate…

Q: On a Hertzsprung-Russell diagram, where on the main sequence would we find stars that have the…

A: We need to investigate where we find the largest main sequence stars in the H-R diagram.

Q: If a star has a surface temperature of 3000 K but a luminosity 150 times greater than our Sun, what…

A: luminosity =  150 times greater than Sun, temperature = 3000 K what size is this star?

Q: Describe the spectra for a spectroscopic binary for a system comprised of an F-type and L-type star.…

A: Given Describe the spectra for a spectroscopic binary for a system comprised of an F-type and L-type…

Q: Why is it that we can describe the life cycle of a star and be confident about it?

A: It is required to describe how we can get an idea about the life cycle of a star.

Q: Give ALL correct answers referring to the properties of known stars, i.e., B, AC, BCD...…

A: Required : Correct answers:

Q: does the H-R diagram show? Explain the main sequence of stars.

A: The H-R diagram is Hertzsprung- Russell Diagram, it is a graph in which absolute magnitude of stars…

Q: Consider three main sequence stars: Star A is 14,500 K, Star B is 2,900 K, and Star C is 5,500 K.…

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