Suppose that a neutron star has a radius of 10 km and a temperature of 1,000,000 K. How luminous is it?
Q: Supernova A is farther away than supernova B. The brightness of supernova A will be ________ than…
A: The brightness of supernova and its distance from the observer are related as
Q: The mass-luminosity relation describes the mathematical relationship between luminosity and mass for…
A: L/Lo = (M/Mo )3.5 here the luminosity is to be found in terms of Lo M = 4Mo
Q: person weigh on the surface of this star?
A: Mass of sun, m Mass of star, M=1.8×m Radius of Sun, r Radius of star, R=0.06×r Given, weight of a…
Q: Which stars are associated with a planetary nebula? black holes, neutron star's, white dwarf or main…
A: Required : What are planetary nebula associated with.
Q: Which of the following statements about Supernova 1987A is FALSE? a. it exploded relatively close…
A: Supernova is a cosmological event. When a star reaches to its end time of it's life, then it gets…
Q: What are the approximate spectral type, temperature, absolute magnitude number, and luminosity of…
A: Required : Spectral type, absolute magnitude, temperature and luminosity of star E.
Q: Determine the radius of a neutron star with a mass of 2 solar masses.
A: Neutron stars are formed when massive stars die. A star is formed due to the balance between…
Q: A newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a…
A:
Q: What is the life expectancy (in years of a 19M main-sequence Star? What is the life expectancy (in…
A:
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: 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: Calculate the luminosity of an 8 solar mass star.
A: The luminosity of a star is the amount of energy that it radiates per second. It can be considered…
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 characterizes a star of spectral-type A in the visible part of the spectrum? Strong lines…
A: Spectral type A has wavelength ranging from 290-390 nm. They have very strong hydrogen lines.
Q: White dwarfs have a temperature of 100×103 K. Calculate the maximum wavelength of a White dwarf.
A: A white dwarf is a stellar core remnant that is highly dense and made of electron-degenerate matter.…
Q: At what wavelengths do stars of surface temperates 20 000 K, 10 000 K, and 3000 K have their peak…
A:
Q: What is the luminosity of a star having three times the radius of the Sun and a surface temperature…
A: The luminosity of a star is a measure of the total amount of energy that is radiated by a star per…
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: What characteristics must a binary star have to be a good candidate for a black hole? Why is each of…
A: The characteristic must a binary star posses for it to be a good candidate for black hole is, From…
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 newly discovered bright star has a luminosity of 78.4×1026 W. What is its temperature if it has a…
A:
Q: .
A:
Q: What happens to a White Dwarf's radius if a little mass is added? What happens if a companion star…
A:
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: What is the difference between type I and type II supernovae
A: To determine Difference between type I and type II supernovae
Q: What did you calculate for the radius of the star that had a temperature of 5880 degrees Kelvin and…
A: Given : Temperature=T=5880∘ K Luminosity=L=78 W We have to calculate the value of radius R of the…
Q: why are Cepheid variable stars good distance indicators? What about supernovae?
A: Named after delta-Cephei, Cepheid Variables are the most important type of variable because it has…
Q: describing the various stages in the life of a 1.0 solar mass star, 0.5 solar mass star, and a 3.0…
A: In this question we have to describe the life of a 0.5, 1.0 and 3.0 solar mass stars.
Q: What are the on the axes of a Hertzsprung-Russell diagram? (b) Name one thing you can tell about a…
A: Hertzsprung-Russell Diagram plots the temperature of the start against their luminosity (or) colour…
Q: The main-sequence age of a star of 1M⊙ is about 1010 years. What is the main-sequence age of a star…
A: Answer the following question is
Q: A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many…
A: Given: Tstar = 9600 KRstar =2.2 RsunTsun=5778 KMstar = 3.3 Msun
Q: If a neutron star has a radius of 12 km and rotates 1,352 times a second, what is the speed at which…
A: radius of neutron star (r) = 12 km = 12000 m angular speed (ω) = 1352 revolutions per second
Q: A main sequence star of mass 25 M⊙has a luminosity of approximately 80,000 L⊙. a. At what rate DOES…
A: Given information: The mass of the star (m) = 25M⊙ The luminosity of the star (L) = 80000L⊙ part a):…
Q: If a neutron star has a radius of 13 km and a temperature of 9.0 x 10° K, how luminous is it?…
A:
Q: How many times hotter than our sun is the hottest type O star, which has a surface temperature…
A:
Q: How does a white dwarf differ from a neutron star? (Select all that apply.) A white dwarf is less…
A:
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- A red giant star has a temperature of 3900 K and a luminosity of 13600 LSun. How many times bigger is this star than the Sun? Hint: You need the surface temperature of the sun for this problem. Use the value in the book, 5800K.what is the mass of a star with a main- sequence lifetime of 3 billion yearsSuppose that a neutron star has a radius of 13 km and a temperature of 7,000,000 K. How luminous is it?
- What is the luminosity of a star having four times the radius of the Sun and a surface temperature of 8,000 K?If a neutron star has a radius of 15 km and a temperature of 7.5 x 106 K, how luminous is it? Express your answer in watts and also in solar luminosity units. (Hint: Use the relation Use 5,800 K for the surface temperature of the Sun. The luminosity of the Sun is 3.83 × 1026 w.) luminosity in watts luminosity in solar luminosity units LoDo this in 10 min. I will give like on answer
- What is the mass of a star with a main-sequence lifetime of 6 billion years?Studying the spectrum of a star, we see that the Haline (l= 656.285nm) has been shifted to 656.286 nm. Is the star moving towards us or away (explain your answer) How fast is the star moving with respect to us?A star has a radius of 2RO and has a temperature of 3TO. Calculate the luminosity in solar units.