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)?
Stellar RadiiThe red supergiant (RSG) star Betelgeuse has a luminosity of 120,000L, and a surface temperature...
Betelgeuse, a bright red star in the constellation Orion, has a luminosity that is 100,000 times that of the Sun However, the surface temperature of Betelgeuse is only 3000 K. Assuming that the emissivity of stars is 1, find the radius of Betelgeuse.
Question 2. The supergiant star Rigel has a parallax 3.78 mas, apparent magnitude m = 0.1, and surface temperature T = 12,100 K. Calculate its: distance [parsec] luminosity [solar units], radius [solar radii]
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.
Which star should radiate more energy: The red supergiant Betelgeuse (about 1000 solar radii in diameter) or The blue supergiant Rigel (about 100 solar radii in diameter) and why? please explain fully in a paragraph.
Betelgeuse - the right shoulder star of Orion - is a red giant star. Its radiation peaks in the infrared at ? = 800 nm. What is the surface temperature of the star?
The distance from Earth of the red supergiant Betelgeuse is approximately 643 light-years. If it were to explode as a supernova, it would be one of the brightest stars in the sky. Right now, the brightest star other than the Sun is Sirius, with a luminosity of 26LSun and a distance of 8.6 light-years. How much brighter in our sky than Sirius would the Betelgeuse supernova be if it reached a maximum luminosity of 1.1×1010 LSun? Express your answer using...
A red giant star has a temperature of 4500 K and a luminosity of 10700 LSun. How many times bigger is this star than the Sun?
9. The red super-giant star, Betelgeuse, has a radius of8.21xI m. The spherical surface behaves as a blackbody radiator. If the surface temperature is 3500 K, what is the rate at which energy is radiated from the star? a) 721 1031 w(b210 w (c) 7.7 10 w (d) 2.0 10 w (e) 1.9-100 w 10. The coefficient of linear expansion of a certain solid is 71" C. Assuming this solid behaves like most solids, what is its coefficient of volume...
5. Wien's Law and Stefan-Boltzmann Law A supergiant star has a surface T of 21,000 K. Its power output is 80,000 times that of the Sun; the Sun's power is 3.9 x1026 W. a. What is Amax for this supergiant star? b. What part of the electromagnetic spectrum is this? c. What is the radius of this supergiant, in meters? Treat it as a perfect black bod d. How many solar radii is this? y. An old-school lightbulb is about...
1. [5 marks] Betelgeuse (α Orionis) has been carefully examined using interferometry. In fact, in 1920 it became the first star (aside from the Sun) to have its angular size measured. A recent measurement put the value at 54.7 milliarcseconds. According to data from the Hipparcos satellite, its parallax is 5.07 milliarcseconds. This star is a red supergiant. [Hint: the values given here may not give you the same results to the questions below as you would find on the...