1:Which star has been redshifted the most? 2:Which star is moving towards us the fastest? Star C Star D Star A Star B   3:The wavelength of this spectral feature is measured to be 600nm in the lab, and 609 in Star A.  What is the radial velocity of Star A? using km/s,

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

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Q: a. In which cluster(s) would you not expect to find a white dwarf? List all that apply. b. You…

A: for the white dwarf : If the star has a mass less than 1.44 of the sun's mass, it becomes a white…

Q: How many times brighter or fainter would a star appear if it were moved to: a. twice its present…

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Q: A star has a surface temperature of T = 10,000 K and a radius three times that of the Sun, R = 3R…

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Q: What star is a white dwarf that is much more dim and hotter than the sun. and which type of stars…

A: 1.carbon-oxygen white dwarfs 2. hydrogen- fusing white dwarfs 3. Sirius B 4. Procyon B 5. Stein 2051…

Q: 4. Suppose we observe a binary star system in which one star is much more massive than the other and…

A: Mass of larger star are M = v2RGWhere v = 104m/sR = 1013mG = 6.67×10-11m3/kg.s2so M = (…

Q: bsorption lines produced by interstellar gas   a. are wider than the lines from stars because the…

A: Introduction: The gas between stars is mostly hydrogen and helium scattered at varying densities…

Q: If the stars at the turnoff point of a cluster have a mass of 3 M, what is the age of the cluster?…

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Q: 3) indicate which locations in the H-R diagram correspond to places where the evolution is slow.…

A: Using the H-R diagram shown the places where the evoultion has been slow is identified.

Q: If the main-sequence mass lower limit is 0.08 solar mass and the brightest main-sequence stars are 1…

A: The Main Sequence Stars are a mass sequence, with low mass stars forming an equilibrium with a cool…

Q: Which of the following is least reasonable regarding a star's position on the HR diagram? Group of…

A: "White dwarfs are small and cool and are located in the lower left part of the HR diagram."This…

Q: The chemical abundance of population I stars   a. indicates that they were formed before the…

A: Population I star consist of sun and tend to be hot, young, luminous and focused in the spiral…

Q: Describe why numerical modelling of stellar structure requires both outward and inward integration…

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Q: Consider two stars: one being a red giant with a spectral type K0 and one being a supergiant with a…

A: The intrinsic luminosity of a star is given by Stefan-Boltzmann's law as L=σAT4σ is the…

Q: Our Sun is considered an "average" star. What is the average star really like? Explain. Could you go…

A: We can define an average star as:  An average star, or more properly, an intermediate-mass star,…

Q: Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…

A: 1. Suppose you observe a tight eclipsing binary with orbital period of 3 days, and radial velocity…

Q: protostar • main-sequence • post-main-sequence

A: A Hertzsprung–Russell diagram (HR diagram) is a plot of stars' luminosity versus temperature, which…

Q: A planet orbits 1 AU from a star that is 2 times as massive as our Sun. How does the star's…

A: Let, The luminosity of the star = L The luminosity of the Sun = LSun The mass of the star  = M The…

Q: The luminosity class of a star tells an astronomer: O how long ago the star formed O whether the…

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Q: . Imagine a giant sphere with a radius of 1 AU surrounding the Sun. What is the surface area of this…

A: "Since you have posted a question with multiple sub-parts, we will solve the first three subparts…

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: From its spectral type, the surface temperature of a main sequence star is measured to be about…

A: Using the 1r2 rule method, we can find out the star's distance by measuring the intrinsic brightness…

Q: Star A has a temperature of 5,000 K. How much energy per second (in J/s/m2) does it radiate from a…

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Q: Star clusters are important to our study of stars because   a. all stars formed in star clusters.…

A: A star cluster is a group of stars that share a common origin and are gravitationally bound for some…

Q: Tutorial Star A has a temperature of 6,000 K. How much energy per second (in J/s/m²) does it radiate…

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Q: The approximate relationship between the luminosity and the period of Cepheid variables is Lstar[in…

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Q: Star A has a temperature of 5,000 K and Star B has temperature of 6,000 K. At what wavelengths (in…

A: Temperature of star A = 5000 k temperature of star B = 6000 k

Q: The total luminosity of the Sun is 4e26 Watts. a) What is the mass (in kg) that the Sun loses each…

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Q: Explain in full detail how and why medium-mass stars like the Sun evolve off the main sequence. Be…

A: Answer is explained below with proper explanation

Q: Stellar Classification and H-R Diagram Placement (40 points available). a. Where is your star…

A: ..

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: Based on what you know about main-sequence stars, select all of the correct statements from the…

A: Required : Correct statements .

Q: How high or low a star is on the main sequence is dictated primarily by ... Select one: A. its…

A: Answer:   A high or low a star is on the main sequence is dictated primarily is discussed below:

Q: (1) How and why does the strength of the hydrogen absorption lines vary between stars of different…

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Q: Based on what you learned about stellar evolution, select all of the correct statements from the…

A: 1. Correct: From the studies, it has been found that the period of some Cepheid variables actually…

Q: Of the 2 stars: a low-mass star or high-mass star: a. Which star has more fuel? - b. Which star…

A: This is a question regarding the lifetime of a star. A star burns by the process of fusion. In…

Q: What do these three nebulae have in common? NOTE: There are multiple correct answers. Select all…

A: (1) As we know that Nebulae are made of dust and gases mostly hydrogen and helium. (2) The dust and…

Q: Number the following stages in the life cycle of a sun-like star in order of occurrence (1-8): White…

A: There are billions of galaxies in the universe and in it there are billions of stars. Stars are…

Q: Which of the following statements is wrong? A. A main-sequence star is cooler and brighter than it…

A:

Q: the Sun?

A: Given: To explain the star which is white supergiant star also brightest and hottest than the Sun…

Q: A radio broadcast was made in 1913. Since that time until 2011, how far has that radio broadcast…

A: The radio waves in a radio broadcast travel at the speed of light, that is 300,000 km/sec. So if the…

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: Match each statement with the appropriate item (If the first corresponds to B and the next 4 to C,…

A: (1) When a main sequence star runs out of hydrogen fuel, nuclear fusion ceases and the star starts…