Planetary Science

What two characteristics determine the brightness of a star?


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2009-12-09 17:26:21
2009-12-09 17:26:21

How bright a star appears to us depends on what type of star it is, and how far away it is. Brightness and temperature are the two characteristics of a star that are plotted on the Hertzsprung-Russell diagram. Distance, Temperature, any intervening bodies, and the materials that make it up.


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The two factors that determine the brightness of a star are:Luminosity - How much energy it releases in a given time.Distance - How far the star is from the observer.

distance from the sun and the age of the star

Here the two things to be taken into account are the brightness and the distance of the star.

The characteristics of a star shown in the H-R diagram are the temperature and the absolute brightness

I suggest you look up each of the stars - for example on Wikipedia - and decide what characteristics you want to concentrate on. Two different stars may be different in the following characteristics: mass; diameter; color; surface temperature; distance from Earth; apparent brightness; absolute brightness; and several others.

Two factors that affect a star's apparent brightness are: 1.) The distance between the Earth and the star 2.) The absolute magnitude (the actual brightness) of the star Hope that helps :P

Brightness and Temperature are the two characteristics plotted on the H-R diagram a diagram used to plot the absolute magnitude of stars and their temperatures

there are two separate ways that astronomers measure the brightness of a start, there is actuall and aparent brightness. In apparent brightness, the measure how bright it looks to all the humans on Earth. However, the actual brightness of a star is different. Say a star is really, really bright, but really far away. That star would look preety dim. Or if a star is not so bright, but really close, like the Sun. The actuall brightness of a star is harder to measure, but is possible by use of waves and stuff like that, I don't know too much about actuall brightness

I believe it's Surface Temperature and Absolute Brightness.

Scientists actually use two measurements to identify a star's brightness. One is luminosity, or the energy that star puts out. Another is magnitude, or the amount of light a star puts out.

Two things. First, the magnitude of a star; its brightness Then, the magnitude is viewed through two different filters. They are either U(ltraviolet) and B(lue) or B and V(isual), and belong to a photometric system called the UBV system. From this, optical astronomers extrapolate the effective temperature of a star from its colour.

Three things, really. An astronomer needs to determine the apparent brightness of a star or other object, and needs to know its distance. He would also need to have an estimate about extinction - that is, how much of the light is absorbed on its way.

Here the two things that we must take into account are , the distance of the star from the earth, and secondly the great distance of the star from the earth.

They vary in size of brightness and colour because it depends on if they are futher or closer to the planet Earth, and also the colour that you see is millions of years old. There are two types of brightness and they are 'appearent brightness' and 'absolute brightness', the difference between these two are distance and energy output. Astronomers often refer to the total energy emitted by a star as its' "luminosity".

brightness and temperature are both related because brightness is actually tempature. However the system has become more refined. Instead of just looking at the star and determining magnitude one or magnitude two, an astronomer measures the brightness of the star using a device called a photometer. The photometer counts the number of photons coming from the star. This photon count is then compared to the photon count from a star whose magnitude is known. An accurate magnitude can then be calculated.

Apparent magnitude is how bright a star appears from earth. You can have two equally bright stars, but if one is much closer to the earth then that would have a greater apparent brightness.

A star's luminosity depends on two characteristics: sizeand temperature of star.

Two Main factors. It's absolute brightness and it's proximity make as tar bright.

1). The location of the earth. 2). The location of the star.

Two stars revolving around one another (around their center of mass, to be precise) are called a "binary star". There is no special name for the case that the brightness is unequal; this is actually the usual case.

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