What is the escape velocity (in km/s) from the surface of a 1.5 M neutron star? From a 3.0 M neutron star? (Hint: Use the formula for escape velocity, Ve = 2GM r ; make sure to express quantities in units of meters, kilograms, and seconds. Assume a neutron star has a radius of 11 km and assume the mass of the Sun is 1.99 ✕ 1030 kg.) 1.5 M neutron star km/s3.0 M neutron star km/s

Q: A red giant star might have radius = 104 times the solar radius, and luminosity = 1730 times solar…

A: This problem can be solved using Stefan-Boltzmann law of Black body radiation.

Q: The difference in absolute magnitude between two objects is related to their fluxes by the…

A: The difference in absolute magnitude between two objects is related to their fluxes by the…

Q: A planetary nebula expanded in radius 0.3 arc seconds in 30 years.  Doppler measurements show the…

A: The rate of expansion, vkm/s=35.0 km/s   The expansion radius, r=0.3 arc s   The time duration,…

Q: star with mass m, period Ti = 30 days, and radius ri = 1E4 km collapses into a neutron star (Links…

A: Given that                    The initial radius of the stat ri = 1.0×104Km and             Time…

Q: Which of the following is NOT the result of the death of a massive star? Select one alternative:…

A: Hypernova is the type of phenomenon that happens when a massive star collapses into this and results…

Q: If the radius of the neutron star is 85.074 km, what is the average density of a neutron star that…

A: mass of the sun, Msun=1.989×1030 kg Radius of the sun, R=85.074 km Volume, V=43πR3

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: What is the escape velocity Vesc of a 1.4M⊙ neutron star if its radius is 12 km? Express your answer…

A:

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

A:

Q: What is the average density of a neutron star that has the same mass as the sun but a radius of only…

A: Given,  mass of sun = mass of neutron star (m) = 1.989×1030 kg  radius = 86.31 km

Q: If a neutron star has a radius of 9.12 km and a temperature of 3.63 x 106 K, how luminous is it in…

A: 1)Using stefan's lawP = σ A T4Where P is the power σ is the stefan's constant A is the area of…

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: Calculate the total energy output per second in watts (W) of a star that converts 900 million tonnes…

A: To calculate the energy output per second in watts (W) of a star that converts 900 million tonnes of…

Q: fill in missing word a) One difference between a type I and type II supernova is the formation of…

A: Few sentences are given and we need to fill in the blanks.

Q: A 2-solar-mass star on the main sequence would have a luminosity of approximately ____________ solar…

A: Given A 2-solar-mass star on the main sequence would have a luminosity of approximately, as…

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: Assuming that at the end of the He burning phase of the stellar core (r R_core). Calculate the…

A:

Q: 24 If the Temperature of the core of a supernova is 3200 x 1023 K, what should be the average…

A: Step 1:Step 2:

Q: a supernova remnant is now 2.95 pc in radius and is expanding at 3,850 km/s. approximately how many…

A: Given information: The radius of the supernova remnant (D) = 2.95 pc = 2.95 (3.1×1013 km) = 9.145…

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: What is the orbital period (in s) of a bit of matter in an accretion disk that is located 6 ✕ 105 km…

A: Write the given values with the suitable variables. r=6×105 km=6×108 mM=99Mo=992×1030 kg=198×1030 kg…

Q: A neutron star has a radius of 11.5 km and a mass of about 1.35M Calculate the density of this…

A:

Q: 1. The neutrino flux from SN 1987A was estimated to be 1.3 x 1014 m-2 at the location of Earth. If…

A:

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: Let's compare the acceleration due to gravity at the surface of a Sun-like star to a white dwarf of…

A:

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

A: Given Apparent magnitude, m=19.89 Absolute magnitude, M=-19 We know, m-M=5log(d10) where d is the…

Q: Vega has Mv = 0.5. How large is Mbol? Calculate the luminosity of Vega. Remember that Mbolo = 4.75.…

A: Given information": The absolute visible magnitude of Vega (Mv) = 0.5 The Spectral class of Vega is…

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: calculate the main sequence lifetime of (a) a 4M☉ star, and (b) a 0.75M☉ star. Express the lifetimes…

A: The lifetime of the  main sequence stars is given as: τMSτSun = MMsun-2.5 where,  τsun = 1010 years

Q: A 1.8 M neutron and a 0.7 M white dwarf have been found orbiting each other with a period of 28…

A: Kepler’s third law for binary stars

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.