Use  t =  1 M2.5  to compute the life expectancy of a 0.6-solar-mass star. (A solar lifetime is approximately 10 billion years.)  yr Why might this be an underestimate if the star is fully mixed by convection? a) If the star is fully mixed its mass will be much larger than 0.6 solar masses. b) If the star is fully mixed its mass will be much smaller than 0.6 solar masses.     c) If the star is fully mixed it will

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A: Given data: The initial temperature of the protostar is T1=3500 K. The initial luminosity of the…

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A:

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A:

Q: A 46M Sun main sequence star loses 1 MSun of mass over 105 years. (Due to the nature of this…

A: Total mass is The main sequence star loses  of mass over Find:(a) The solar mass lost in a year.(b)…

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A: Given: Zero Age Main Sequence is beginning point of the main sequence of the star. The radius at…

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A: Our Galaxy is pervaded by a diffuse mixture of gas and dust that occasionally becomes denser,…

Q: Consider a close binary system composed of a white dwarf, a giant star, and an accretion disk. Which…

A: Given Data: Let us consider the given closed binary system composed of a white dwarf , a giant star…

Q: Two stars are in a closely orbiting binary system. The smaller star (a K-type main sequence star)…

A: The correct option. Following the mass transfer, which of the following is now true of the main…

Q: How long a star "lives" depends on: O its color. whether it is single or binary. O its starting…

A: The more mass the star has faster it burns down and explode into a supernova.

Q: Put in order, from earliest to latest, the sequence of events that lead to a star becoming a red…

A: When a star runs out of hydrogen fuel, nuclear reactions can no longer happen and the star starts…

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: require(s) that a young hot star (T ≥ 25,000 K) be relatively nearby.

A: Correct answer is Emission nebula

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

A:

Q: Wher would a star be located in the main sequence relative to the sun if its mass is 10 times that…

A: The position of the sun is in the middle of the H-R diagram due to its moderate temperature,…

Q: 12) Calculate the absolute magnitude of a star with a luminosity of 3.2L-sun-

A: The absolute magnitude defines how bright a star would be if it was observed from a distance of 10…

Q: 1. In this question, you may assume that the core temperature in the Sun is T=15x10$K. L Bolatively…

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

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Q: a Given a star formation rate of 50 M yr−1, what is the measured Hα flux, in erg/sec? b What types…

A: Introduction: Hα flux is often used in astronomy to study the emission of ionized hydrogen gas in…

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: 1 There are 200000 AU radius clouds will form a star of 10 solar masses and the 150000 AU radius…

A:

Q: With a 14 solar mass star example. Describe how its position on an H-R diagram will change as it…

A: A star with 14 solar masses is categorized as a B1 type star. When a significant amount of the…

Q: - The nebula is at a dist e Stars about 1344 ly bserve a star in the Oric ent magnitude of 6.75 m

A: Given, Distance of nebula from earth as, d = 1344 light year = 412.07 Parsec Apparent magnitude of…

Q: a) What is a binary star system? (b) describe briefly two methods for showing that a system is a…

A: (a) A binary star system is a system of two stars orbiting each other around a common center. Binary…

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

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: 8) Calculate the luminosity of a star that has a radius of 3Rs and a temperature of 2Tsum-

A: The luminosity of a star or a galaxy is defined as the energy radiated by the star or galaxy.…

Q: 3. a) Explain how it is possible for the core of a red giant to contract at the same time that its…

A: a) The core of a red giant contracts due to depleted fuel, while nuclear fusion in surrounding…

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: 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: 1.  A planetary nebula has an angular diameter of 76 arc seconds and a distance of 5100 ly. What is…

A: 1.Small angle Formula:D=αd2.06×105where, D is the linear diameterα is the angular diameter=76 arc…

Q: Iron is unique among the elements in terms of its nuclear properties, and this gives it a decisive…

A: Explanation: Iron is not the heaviest element that stars can produce, just the heaviest one that can…

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: Draw the evolution of a 1 Mo star on the H-R diagram from the zero age main se- quence to the white…

A: Step 1: Evolution of stars: Change in the properties of stars resulting in their passing through…

Q: There are 200000 AU radius clouds will form a star of 10 solar masses and the 150000 AU radius…

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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: How long (in years) will a 0.06Msun main sequence star live? (The solar lifetime is 11 billion…

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Q: c) The star may be assumed to evolve with effective temperature, Teff, remaining constant. Show that…

A: To start, we'll use the equation for the luminosity of a star: where L is the luminosity, R is the…

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: Consideration of the total energy in a radio lobe of an AGN implies that the energy is distributed…

A: Explanation -:            The scaling of the magnetic field with observed luminosity (Las) in the…

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

A: Required : Correct statements .

Q: 2. A solar-type star is seen with an apparent magnitude my = 30. Assuming that there is no…

A: As we know that,The distance modulus is a common technique of measuring distances in astronomy. It…

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: 7. Let's characterize a typical neutron star. (a) Compute its luminosity in units of the solar…

A: The neutron star has a surface temperature of 106 K and a radius of 7 km One solar luminosity is…