What is the relationship between a stars luminosity and radius?

This is the Luminosity-Radius-Temperature Relation for stars. In words: ” The Luminosity of a star is proportional to its Effective Temperature to the 4th power and its Radius squared.”

What is the relationship between luminosity and temperature for stars on the main sequence?

What is the relationship between luminosity and temperature for stars on the Main Sequence? The brighter it is, the hotter it becomes.

What characteristic of a star is directly related to its spectral class?

The spectral type of a star is directly related to its color. Recall that a star emits light as a blackbody, which has a particular shape to its spectrum, as shown in this figure.

What spectral type is biggest in radius?

A supergiant is the largest known type of star; some are almost as large as our entire solar system. Betelgeuse and Rigel are supergiants….Spectral Classes.

Color	Blue
Approximate Surface Temperature	over 25,000 K
Average Mass (The Sun = 1)	60
Average Radius (The Sun = 1)	15
Examples	10 Lacertra

What is the relationship between luminosity and mass?

When the luminosity of main sequence stars is plotted against their masses, we observe a mass‐luminosity relationship, approximately of the form L ∝ M 3.5 (see Figure ). In other words, doubling the mass of a main sequence star produces an increase in luminosity by a factor 2 3.5 = 11 times.

What is the relationship between mass and radius of a star?

The mass-radius relation is a relationship between the radius, R, of a main-sequence star and its mass, M. If R and M are both in solar units, then R = M 0.8.

What is the relationship between a star’s mass and expected life?

A star’s life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion.

What is the relationship between a star’s temperature and expected life?

The higher the temperature of a star, the shorter the lifetime. The blue stars will die out more quickly since their high temperatures will burn through the fusion fuel elements more quickly than the colder red stars.

Why are spectral lines useful in classifying stars?

Why are spectral lines useful in classifying stars? They show the composition of a star.

Why are spectral lines useful in classifying stars quizlet?

Spectral class corresponds to temperature. from relative strengths of absorption lines in a star’s spectrum. narrow, the star’s diameter is large. If the lines are wider, the star’s diameter is smaller.

What do we mean by a stars spectral type?

Spectral types are a way of classifying stars according to their color or what spectral lines we see in their light. The spectral types run OBAFGKM, where O stars are the hottest and M are the coolest. The spectral type tells us the stars temperature while the luminosity class tells us its radius.

What is the relationship between star mass and energy output?

Mass determines how hot the stellar core gets in response to gravitational contraction, and since the rate of nuclear burning is very sensitive to temperature, a star’s mass determines the energy production rate (luminosity), and whether/when gravitational contraction can lead to explosive release of energy for massive …