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…

A:

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

A:

Q: Choose the correct statements concerning spectral classes of stars. (Give ALL correct answers, i.e.,…

A: A) The K star or orange dwarf has spectrum dominated by hydrogen ionization lines not of ionized…

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

A:

Q: 3. By how many magnitudes is a K5 I star more luminous than a K5 V star? How many times m luminous…

A: The magnitude of K5 I star luminosity is 0.46 luminous. The magnitude of K5 V star luminosity is…

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 the mass of stars? Group of answer choices…

A: Stars are of different sizes and they have their own set of characteristics based on multiple…

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

A:

Q: sequence

A: Hertzsprung-Russell's diagram clearly shows that the star spends most of its life as a main-sequence…

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: True or False 8. Almost all stars are in binary systems. The book says: "So far you have been…

A: The statement: All stars are in binary systems. The book says: "So far you have been considering the…

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

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

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: A star with an original mass of 9MSun undergoes an active period where it experiences mass loss via…

A: Given data: Mass of the star, Mstar=9Msun Time, t=1.1 million years = 1.1×106 years New mass,…

Q: Two stars have the same apparent magnitude, my = 14, but Star A has a parallax of 0.060 arc seconds…

A: Required to compare two stars A and B

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

A:

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…

A:

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

A:

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

A:

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…

A:

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

A:

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: 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: 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: 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: 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: How many times hotter than our sun is the hottest type O star, which has a surface temperature…

A: