Table of Contents
- 1 What color is a main sequence star with a luminosity of 100?
- 2 What color is a main sequence star that is only 1 1000 as bright as the Sun?
- 3 What star gives off the most energy?
- 4 What is the luminosity of Barnard’s Star?
- 5 How does the color of a star depend on its mass?
- 6 How is the spectral type of a star used?
- 7 What happens when a star reaches the red giant phase?
What color is a main sequence star with a luminosity of 100?
The G2 spectral type means it is yellow-white in color and the luminosity class V means it a hydrogen-burning, main-sequence star. Betelgeuse is an M2 or a red supergiant….Luminosity classes.
| Symbol | Class of Star | Example |
|---|---|---|
| IV | Subgiants | Procyon |
| V | Main sequence | Sun |
| wd or D | White dwarfs | Sirius B |
What color is a main sequence star that is only 1 1000 as bright as the Sun?
red
Star A is red and therefore, cool. Its luminosity is 1/1000 of that of the sun; therefore, it is dim.
What color are stars that produce the most energy?
Blue colors dominate the visible light output of very hot stars (with much additional radiation in the ultraviolet). On the other hand, cool stars emit most of their visible light energy at red wavelengths (with more radiation coming off in the infrared) (Table 1).
What star gives off the most energy?
There is another star called the Pistol Star. It is in our neighborhood, the Milky Way galaxy. Although the sun is extremely powerful, this star is even much more so. It produces 10 million times more energy than the sun and gives off as much energy in six seconds as the sun does in an entire year.
What is the luminosity of Barnard’s Star?
0.0004 L☉
Barnard’s Star/Luminosity
What is the luminosity of the star Aldebaran?
518 L☉
Aldebaran/Luminosity
How does the color of a star depend on its mass?
The color of the star depends on the surface temperature of the star. And its temperature depends, again, on how much gas and dust were accumulated during formation. The more mass a star starts out with, the brighter and hotter it will be.
How is the spectral type of a star used?
A) The spectral type of a star can be used to determine its surface temperature. B) The spectral type of a star can be used to determine its color. D) A star with spectral type F2 is hotter than a star with spectral type F3.
Which is brighter star 1 or Star 2?
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.) how their true luminosities compare to each other.
What happens when a star reaches the red giant phase?
Once a medium size star (such as our Sun) has reached the red giant phase, its outer layers continue to expand, the core contracts inward, and helium atoms in the core fuse together to form carbon. This fusion releases energy and the star gets a temporary reprieve.