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Does Rigel have a higher luminosity and a lower surface temperature than the sun?
Yes, Rigel has a much higher luminosity than the Sun, being around 120,000 times more luminous. However, it also has a lower surface temperature than the Sun, with a surface temperature of around 11,000 Kelvin compared to the Sun's temperature of approximately 5,500 Kelvin.
Does An HR diagram plots a stars luminosity and surface temperature?
Yes, an HR diagram plots a star's luminosity (brightness) against its surface temperature, also known as color or spectral type. This graph shows the relationship between these two characteristics for different stars, allowing astronomers to classify and study them.
How do astronomers measure stellar luminosity?
The reference that astronomers use to compare the luminosity of other stars is the sun's luminosity. The luminosity is denoted in multiples of the sun's luminosity. For example, the luminosity of the star Sirius is 25 times the luminosity of the sun.
What are the two ways stars are classified?
Stars are classified based on their spectral characteristics, which categorizes them into spectral types (O, B, A, F, G, K, M) based on the temperature of their surface. They are also classified based on their luminosity, which categorizes them into different classes (I, II, III, IV, V) based on their brightness compared to the Sun.
What is Surface temperature of Pegasus?
Pegasus is a Greek mythological winged horse and mythological things don't have temperatures. It's also a constellation which, again, has no surface temperature.
Does Rigel have a higher luminosity and a lower surface temperature than the sun?
Yes, Rigel has a much higher luminosity than the Sun, being around 120,000 times more luminous. However, it also has a lower surface temperature than the Sun, with a surface temperature of around 11,000 Kelvin compared to the Sun's temperature of approximately 5,500 Kelvin.
Does An HR diagram plots a stars luminosity and surface temperature?
Yes, an HR diagram plots a star's luminosity (brightness) against its surface temperature, also known as color or spectral type. This graph shows the relationship between these two characteristics for different stars, allowing astronomers to classify and study them.
What if the star has a bigger surface area but a smaller temperature how would that affect the luminosity?
As temperature decreases, luminosity will also decrease As radius increases (and with it surface area, but radius is a much easier to work with if you're trying to compare stars so we usually say radius) luminosity will also increase. If both are happening at the same time, it is possible that the luminosity of the star will remain more or less constant. Often one change will dominate the other, such as when a star goes through the red giant phase when the increase in radius has a far greater effect than the drop in temperature, and the star becomes more luminous.
What do stars have that depends on their size?
luminosity and temperature depend on their size but also on their mass
How do size temperature and distance affect a star's magnitude or luminousity?
A star's real luminosity is proportional to the the square of its diameter, and more or less proportional to the fourth power of its absolute temperature. The star's apparent luminosity is proportional to its real luminosity. It is also inversely proportional to the square of the distance.
Why does luminosity of the star depend on both its radius and surface?
If the radius is larger, the surface will also be larger. As a functional dependency, you only need one - the radius, or the surface - whatever.
How is it possinle for whit dwarfs to have a lower luminosity than the sun even though the sun is much cooler than the white dwarf?
Luminosity will also depend on the surface area. The Sun has about 10,000 times the surface area of a typical white dwarf.
How do white dwarfs compare with super-giants in terms of temperature and luminosity?
The plural of dwarf is "dwarves". White dwarves are hotter than supergiants. White dwarves also have much less luminosity. This is related to their very small surface area. Since white dwarves no longer produce energy, they will cool down over time - but this takes quite a while.
What does the HR diagram depict?
The HR diagram, also known as the Hertzsprung-Russell diagram, depicts the relationship between the luminosity and temperature of stars. It shows how stars are distributed in terms of their brightness and temperature, allowing astronomers to classify stars based on these characteristics.
The surface temperature of the star Rigel is about 15000celiusThe sun has a temperature of about 6000celius Why does the sun appear so much brighter?
The brightness of a star depends not just on its surface temperature, but also on its size and distance from Earth. While Rigel is hotter than the Sun, it is also a much larger and more luminous star. Therefore, even though the Sun is cooler than Rigel, it appears brighter to us because it is much closer and has a larger luminosity due to its size.
How do astronomers measure stellar luminosity?
The reference that astronomers use to compare the luminosity of other stars is the sun's luminosity. The luminosity is denoted in multiples of the sun's luminosity. For example, the luminosity of the star Sirius is 25 times the luminosity of the sun.
What are the two variables that incorporated in the Hertzsprung Russell diagram?
Essentially it's 'brightness' on the vertical scale and colour on the horizontal scale. The brightness can be expressed as luminosity, compared with our suns luminosity, or as absolute magnitude. The colour can also be expressed in terms of temperature, the colour shows what the temperature is. The colour can be categorised in to groups or spectral classes.
