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How does the temperature and luminosity of the sun compare to that of the other stars on the main sequence?
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What does the life span of a star depend on?
How massive it is and its luminosity (the mass and luminosity correlate with each other with most stars, mainly the main sequence stars). The more mass a star has, the shorter its lifespan.
What happens to the temperature of main sequence stars as the brightness increases?
Stars in their Main Sequence stage have generally proportional temperature and color. The color-temperature spectrum of a star ranges from red (2000-3000 Kelvins) to blue (25,000+ Kelvins). Red Giants have a relatively high luminosity and low temperatures. White dwarfs have relatively low luminosity and high temperatures. Main Sequence stars are proportional temperature/color therefore they can vary from relatively high luminosity and temperature to relatively low luminosity and temperature.Absolute Magnitude is the star's genuine brightness. It's apparent magnitude is it's brightness from earth. A star can only be accurately classified once data on it's absolute magnitude is acquired.
If something is hotter and smaller does it give off a greater luminosity?
an increase in temperature or radius causes an increase in luminosity, assuming the other variable doesn't change. luminosity is the total energy output, rather than a measure of energy output against 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.
Does apparent magnitude refer to real luminosity?
No. Apparent magnitude (or luminosity) means how bright a star (or other object) looks to us; absolute magnitude (or luminosity) refers to how bright it really is.
What happens to the temperature of main sequence stars as the brightness increased?
Brightness is a value of luminosity verses distance as viewed from a point.From Earth, the luminosity of a star is it's apparent magnitude, whereas absolute magnitude is it luminosity as viewed from a set point (for stars this value is about 32 light years).Because of this a star can loose temperature but gain in diameter and appear brighter, in contrast a star can contract and thus shrink, but heat up and appear brighter.Brightness is related to temperature, not the other way around.
What does the life span of a star depend on?
How massive it is and its luminosity (the mass and luminosity correlate with each other with most stars, mainly the main sequence stars). The more mass a star has, the shorter its lifespan.
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 happens to the temperature of main sequence stars as the brightness increases?
Stars in their Main Sequence stage have generally proportional temperature and color. The color-temperature spectrum of a star ranges from red (2000-3000 Kelvins) to blue (25,000+ Kelvins). Red Giants have a relatively high luminosity and low temperatures. White dwarfs have relatively low luminosity and high temperatures. Main Sequence stars are proportional temperature/color therefore they can vary from relatively high luminosity and temperature to relatively low luminosity and temperature.Absolute Magnitude is the star's genuine brightness. It's apparent magnitude is it's brightness from earth. A star can only be accurately classified once data on it's absolute magnitude is acquired.
If something is hotter and smaller does it give off a greater luminosity?
an increase in temperature or radius causes an increase in luminosity, assuming the other variable doesn't change. luminosity is the total energy output, rather than a measure of energy output against size.
What is the luminosity of a star is related to?
It's related to its surface area (proportional to the square of its diameter, or radius); as well as to the temperature (the total energy emitted is roughly proportional to the fourth power of the absolute temperature).Ultimately, of course, the luminosity depends on the energy production in the star's interior, which depends, among other things, on the star's core temperature.
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.
How does the sun compare with other stars in the age and temperature?
age is ka echusan temperature is kabaliwan
Does apparent magnitude refer to real luminosity?
No. Apparent magnitude (or luminosity) means how bright a star (or other object) looks to us; absolute magnitude (or luminosity) refers to how bright it really is.
What is physical fundamental?
Those quantities which cannot be derived from any other such as length, mass, time, temperature, electric current, light luminosity are examples for fundamental physical quantities.
How does the temperature of the earth's mantle compare to the other layers of the earth?
The mantle is the 2nd hottest
What is an HR diagram and what does it mean to the stars?
A HR diagram(abbreviation of Hertzsprung Russel diagram) is a graph of stars' surface temperatures(x axis) versus their luminosities(y axis). Basically, what we do is observe a lot of stars, find each star's temperature and luminosity and put them all there on the graph. This graph is important in understanding stellar evolution due to a theorem called ergodic theorem. Let us see how. When a star is born, it has a particular luminosity and temperature. As it lives its life, it's luminosity and temperature keeps changing, and finally it finishes it life. Basically, what I mean is that you take a star when it's born, find its temperature and luminosity, put that on a graph that reads luminosity versus temperature for y and x axis respectively, wait a few million years, see the star again, find it's then temperature and luminosity, put that on that graph, and keep doing it till the star dies. What you get then is a graph that tells you how the star's luminosity and temperature changed as it lived it's life. With luminosity and temperature, you can calculate all other stuff about the star and write down it's biography! Do that with all stars, and you get loads of biographies of different stars, and you become a master of stellar evolution! But wait, there is an issue here...a star typically lives it's life in the order of a billion years. We humans evolved one million years back, we discovered telescopes four hundred years back, and a typical human lives a hundred years, how will we understand stars with such little time?! The answer is HR diagram!! Now back to ergodic theorem, it says that seeing a thousand stars as they appear to us now and finding their temperature and luminosity and then putting it on HR graph is same as following a star all it's life! Essentially a shortcut to understanding stars! That's the big advantage of HR diagram in studying stars... of course, the focus of my answer was the importance of ergodicity in studying stars but not explaining in detail the concept of ergodicity. That you can find in any statistical mechanics text book or maybe I can explain that somewhere in answers.com soon! Cheers, hope my answer helped!:)
