A red giant star has a temperature of 4500 K and a luminosity of 10700 LSun....
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?
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A red giant star has a temperature of 4500 K and a luminosity of
10700 LSun....
Betelgeuse, a bright red star in the constellation Orion, has a luminosity that is 100,000 times...
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.
What star is 20 pc from Earth, has a luminosity of 160 times that of the...
What star is 20 pc from Earth, has a luminosity of 160 times that of the Sun, a surface temperature of 4000 K, and has an absolute magnitude of -0.066? How would I figure this out?
Stellar RadiiThe red supergiant (RSG) star Betelgeuse has a luminosity of 120,000L, and a surface temperature...
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)?
The brightest star in the northern celestial hemisphere has a surface temperature of about 4300 K...
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.
6. The bright star Arcturus in the constellation Boötes has a surface temperature about 0.74 times...
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.
We observe a red giant with a luminosity 172 times the Sun's and a wavelength of...
We observe a red giant with a luminosity 172 times the Sun's and a wavelength of maximum radiation of 677 nm. What is its radius? (Use Wien's law, Unit 55, to find its temperature.) Its radius is______ × 1010 m.
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed...
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed luminosity is about 20 LO How can you explain the difference? The mass-luminosity relationship predicts that Sirius is about Sirius's higher luminosity is a result of its higher Sun's. Themassluninosit reSisis a times more luminous than the Sun. surface temperature and lrger surface area compared to the
Which of the following statements about red giant stars are true? (Select all that apply.) Red...
Which of the following statements about red giant stars are true? (Select all that apply.) Red giant stars are less luminous than main sequence stars of the same temperature. Red giant stars tend to be more luminous than main sequence stars of the same temperatures because they are larger in size. Red giant stars are less luminous than main sequence stars because fusion happens more rapidly in main sequence stars. A red giant star of a given temperature is more...
37. Jupiter at its present location, were a star? What would Earth be like ? Assume this hypothetical Jupiter with 75 ×...
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.)
Estimate the luminosity and temperature of the star Vega by examining its vertical and horizontal position...
Estimate the luminosity and
temperature of the star Vega by examining its vertical and
horizontal position in the H-R diagram . (Hint: You should make an
estimate of these values by interpolating between the values marked
on each axis). Using the values you estimated, determine the size
of Vega as compared to the Sun using the Stefan-Boltzmann law.
Spectral type 106 Alnilam 、、\Rigel A 、、\ Betelgeuse Adhara Deneb Antares 、 104 Spica A Polaris Spica B 、\-pergian Canopus Arcturus Rigel...
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.
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed luminosity is about 20 LO How can you explain the difference? The mass-luminosity relationship predicts that Sirius is about Sirius's higher luminosity is a result of its higher Sun's. Themassluninosit reSisis a times more luminous than the Sun. surface temperature and lrger surface area compared to the
Estimate the luminosity and
temperature of the star Vega by examining its vertical and
horizontal position in the H-R diagram . (Hint: You should make an
estimate of these values by interpolating between the values marked
on each axis). Using the values you estimated, determine the size
of Vega as compared to the Sun using the Stefan-Boltzmann law.
Spectral type 106 Alnilam 、、\Rigel A 、、\ Betelgeuse Adhara Deneb Antares 、 104 Spica A Polaris Spica B 、\-pergian Canopus Arcturus Rigel...
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