If a star doubles its temperature but the radius remains the same, what happens to its luminosity?
If a star doubles its temperature but the radius remains the same, what happens to its...
Imagine we find a star that has the same radius as the Sun, but its temperature is 9.6 times greater. That star should be _____ times as luminous as the Sun. Suppose we find a planet with an orbital period of 200 days around a star with the same mass as the Sun, but only 75 percent as luminous. What is the planet’s semi-major axis, in AU?
A neutron star has a radius of 10 km, and a temperature of 1 million K. What is its luminosity?
6. The bright star Arcturus in the constellation Boötes has a surface temperature about 0.74 times that of the Sun. Its luminosity is about 170 times that of the Sun. (a) What is Arcturus’ radius compared to the radius of the Sun (in units of solar radii, ?⊙)? (b) What type of star is Arcturus (a dwarf, a giant, or a supergiant)? Explain your reasoning.
Stellar RadiiThe red supergiant (RSG) star Betelgeuse has a luminosity of 120,000L, and a surface temperature ofaboutTeff= 3650 K. What is its’ radius (in both metres and astronomical units)?
Answer is not complete. If the order quantity doubles but the flow rate remains constant, what happens to the average amount of time a unit spends in inventory? °Decreases by more than 50% Decreases by 50% ORemains unchanged O Increases by 100% or doubles °Increases by more than 50%
The brightest star in the northern celestial hemisphere has a surface temperature of about 4300 K and it is 170 times more luminous than the Sun. Calculate the radius of the star in units of the radius of the solar radius (round the result to the nearest integer) In the calculation, you may assume that the Sun has a radius of 7E8 meters and a luminosity of 3.8E26 watts.
= A1. A distant star is determined to have a surface temperature of Tstar - 6000K and a radius of 5.0 x 108 m. A planet named Hydra is detected orbiting this star at a distance of 1.0 x 1011 m and has an albedo of 0.60. [1] (a) At what wavelength is the peak irradiance from this star? [1] (b) What is the total Luminosity of the star? (c) What is the effective temperature of Hydra? (d) The actual...
37. Jupiter at its present location, were a star? What would Earth be like ? Assume this hypothetical Jupiter with 75 × MJ would be a red dwarf with the same density as the Sun but a surface temperature of only 2500 K. What would be its total luminosity, compared to that of the Sun? (Hint: recall that to be a star, Jupiter would have to be 75 times more mass than it has today.)
Useful equations: = 600nm (5000K/T) lambdamax L oCR2 T What is the peak wavelength of an O star of temperature 30,000 K? What range of the spectrum is this? 1. 2. Imagine we find a star that is 2 times the size of the Sun (in terms of its radius) but with a temperature that is identical to the Sun. What is the luminosity of this star compared to the Sun? a. The same -luminosity depends only ontemperature b. About...
Imagine a hypothetical star of radius R, whose mass density ρ is constant throughout the star. The star is composed of a classical ideal gas of ionized hydrogen, so there are free protons and free electrons flying around providing the pressure support. The star is in hydrostatic equilibrium (a) What is the pressure as a function of radius in the star, P(r)? As a boundary condition, the pressure at the surface should be zero, P(R) 0 (b) What is the...