A neutron star with a radius of 10km is observed to rotate 712 times per second. At what speed, relative to that of light, is the surface of the neu- tron star's equator moving?

Q: a) Calculate the period of the solar system's orbit around the Milky Way. Assume that we are 8.5 kpc…

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Q: Two stars are in a binary system. One is known to have a mass of 0.700 solar masses. If the system…

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

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Q: The Hα spectral line has a rest wavelength of 6562.8 ˚A (remember: 1 ˚A = 10−10 m). In star A, the…

A: Given: The wavelength of the Hα=6562.8 Ao. The wavelength of Hα spectral of star A is 6568.4 Ao. The…

Q: Suppose you observe a star orbiting the Galatic center at a speed of 1000 km/s in a circular orbit…

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Q: If an X-ray binary consists of a 17-solar-mass star and a neutron star orbiting each other every…

A: The expression for the Kepler’s third law is as follows: MA+MB=a3p2                               1

Q: The figure below shows the radial velocity of a star plotted as a function of time over the course…

A: Required to find the position of the planet when it is moving at 18 km/s,

Q: For a main sequence star with luminosity L, how many kilograms of hydrogen is being converted into…

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Q: In the parallax method of determining stellar distances, the angle to a star is measured while che…

A: Let's assume b=1AU And distance between sun and alpha centaurie is d. θ=2.1x10-4…

Q: An astronomical image shows two objects that have the same apparent magnitude, i.e., the same…

A: Let the luminosity of the star is Ls= LoLuminosity of  Milky Way galaxy, Lm=1011LoLuminosity of…

Q: Which star in the table below has the greatest diameter?     Star Name d (parsecs) Parallax…

A: d. 58 Ori

Q: A 1.5 M neutron star and a 0.7 M white dwarf have been found orbiting each other with a period of 10…

A: The expression for the Kepler’s third law for binary stars is as follows: MA+MB=a3p2…

Q: what would its period (in s) be if no mass were ejected and a sphere of uniform density can model HD…

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Q: The apparent magnitude of a star is observed to vary between m = +0.4 and m = +0.1 because the star…

A: Given: The apparent magnitude of the star varies between m+ = 0.4  and m- = 0.1 The radius of the…

Q: Favorite Star Polaris is 132 pc from Earth and has an apparent magnitude of 2.5. What is its…

A: When the brightness of a star is measured there are two ways, Apparent and absolute magnitudes.…

Q: If the accretion disk around a neutron star has a radius of 8 ✕ 105 km, what is the orbital velocity…

A: Given Data: The radius of the neutron star is r = 8 x 105 km. As we know that the mass of the…

Q: The giant star Betelgeuse has an angular diameter as observed from Earth of about 0.05 arc seconds.…

A: Solution:-

Q: Which star in the table below has the least surface temperature?   Star Name d (parsecs) Parallax…

A: Since, distance of the star in terms of Parallax is, d=1parallax (in arc-sec)parsecs Now from…

Q: Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0×10-12 watt/m?.…

A: Luminosity of star (L) = 7×1026 watt Apparent brightness (AB) = 4×10-12 Wm2

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

A: Given data: Mass of the star MStar=3.3 MSun. The life time of the main sequence star is given as,…

Q: The density of Sirius B is 2×106 g/cm3 and its mass is 1.95×1030 kg. What is the radius of the white…

A: The given data are: ρ=2×106 g/cm3=2×109 kg/m3m=1.95×1030 kg Here, ρ and m represent the density and…

Q: is observed to have a period of 10 yr. The radial velocities of the two stars are determined to v1r…

A: Concept used : Two stars orbiting around each other form a binary star system  Given data:-*Time…

Q: A star is observed to have a parallax of 0.05".  If we were to send a radio signal towards this star…

A: The parallax angle of a star is observed to be θ=0.05''=0.05 arcseconds. Let the distance to the…

Q: If the accretion disk around a neutron star has a radius of 8 ✕ 105 km, what is the orbital velocity…

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Q: How close, r, to the center of a neutron star would a manned satellite be orbiting if it were at the…

A: Gravitational force of earth’s surface = Gravitational force of star GMN mr2=mg r= G MNg

Q: If the surface Temperature of a star was about 11000.0 K instead of 7000.0 K what is the ratio of…

A: Given , temperature of the star is 11000 K instead of 7000 K How many times greater is the magnitude…

Q: What is the free-fall time of a 10 MSun main-sequence star? O 100 hours 10 hours O 1 hour O 0.1…

A: The problem is based upon free fall of a star. Here the given star is having the mass 10 times the…

Q: The mass of a star is 1.99·1031 kg and its angular velocity is 1.60E-7 rad/s. Find its new angular…

A: Given data: The mass of the star is m=1.99x1031 kg. The initial angular velocity of the star is…

Q: Two stars are found to orbit each other once every 6.00 months. If the orbital radius (distance)…

A: According to Kepler’s third law, for a binary star system, we have the following relation between…

Q: White Dwarf Size II. The white dwarf, Sirius B, contains 0.98 solar mass, and its density is about 2…

A: It is given that, M=0.98 solar mass=0.98×1.989×1030 kg=1.95×1030 kgρ=2×106 g/cm3=2×106×103…

Q: In a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm . If the…

A: Wavelength of (λ°) = 481.6 nm Difference of wavelength ∆ λ = λ- λ° = 486.1- 485.8 =  0.3 nm Speed of…

Q: The star G1710 is currently at a distance of 62 lightyears and has an apparent visual magnitude of…

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Q: Two stars, named A and B, each with a mass equal to the Sun's mass are in orbit around each other.…

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Q: What is the lifetime on the main sequence of a star whose surface temperature is 6500° K and whose…

A: Denote Stefan’s constant by σ. Evaluate the star’s luminosity (L) from its given temperature (T) and…

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

A: The main sequence lifetime is given as:t α1M2.5it is given star has mass of 3.3 MSunSo,…

Q: If a neutron star has a radius of 15 km and rotates 748 times a second, what is the speed of the…

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Q: Using the center-of-mass equations or the Center of Mass Calculator (under Binary-Star Basics,…

A: Given: In this question, the given details are Consider the star 1 has m1=3.4 solar masses, and the…

Q: The total intensity of light measured on earth, from an ecliptic binary, is plotted in the figure as…

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Q: Question 32 Consider three Main Sequence stars, an O star, an F star and a K star, each with an…

A: Question 32: Among O star, F star, and K star each with a magnitude of 2 . which one is most…

Q: From this new rotation rate (0.175 RATE), the neutron star is slowed to a halt in 3 billion years.…

A: new rotation rate (0.175 RATE)

Q: A star has a period of P = 37 days. It has a radius of 5.7 times the radius of the sun. Calculate…

A: The period of the star: P = 37 days (37 x 24 x 60 x 60 seconds = 3.2 x 106 seconds); The radius of…

Q: A Type Ia supernova is observed and achieves an apparent magnitude of m = 19.89 at peak brightness.…

A: Given Values :The absolute magnitudes of Type Ia supernovae at peak brightness,    M = -19 Apparent…