Table of Contents
- 1 Do main sequence stars decreasing brightness with temperature?
- 2 What is the relationship between temperature of a star and its brightness in the HR diagram?
- 3 What is the temperature of main sequence stars?
- 4 How does the temperature and luminosity of the Sun compared to that of the other stars on the main sequence?
- 5 What is the general relationship between temperature and star brightness luminosity?
- 6 Is the HR diagram plotting apparent brightness or absolute brightness?
- 7 How does the temperature and luminosity of the Sun compare to that of other stars on the main sequence?
- 8 Why it is possible to relate the temperature of a star to its luminosity or brightness?
Do main sequence stars decreasing brightness with temperature?
During the initial collapse, this pre-main-sequence star generates energy through gravitational contraction. From this point, the brightness and surface temperature of stars typically increase with age.
What is the relationship between temperature of a star and its brightness in the HR diagram?
We can summarize this relationship by saying that hotter stars are more luminous than cooler ones. A number of stars, however, lie above the main sequence on the H–R diagram, in the upper-right region, where stars have low temperature and high luminosity.
What is the relationship between temperature and brightness in the HR diagram?
What is the relationship between temperature/color and brightness in the HR Diagram (2 points)? Stars with a high temperature are blue and bright, while stars with a low temperature are red and dim.
What is the temperature of main sequence stars?
Main-Sequence Lifespan
| Mass/MSun | Luminosity/LSun | Effective Temperature (K) |
|---|---|---|
| 10 | 10,000 | 22,000 |
| 15 | 17,000 | 28,000 |
| 25 | 80,000 | 35,000 |
| 60 | 790,000 | 44,500 |
How does the temperature and luminosity of the Sun compared to that of the other stars on the main sequence?
Stars on the Main Sequence that are hotter than the Sun are also larger than the Sun. So hot blue stars are more luminous (and therefore appear higher in this diagram) for two reasons: they are hotter, and hot objects are more luminous than cool objects, but they are also larger.
Does a star’s temperature affect its brightness?
As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off. Temperature also affects a star’s luminosity.
What is the general relationship between temperature and star brightness luminosity?
The Luminosity of a star depends on BOTH its temperature and its radius (surface area): L is proportional to R2 T4. A hotter star is more luminous than a cooler one of the same radius.
Is the HR diagram plotting apparent brightness or absolute brightness?
The diagram above uses apparent brightness (apparent magnitudes), but for stars all at the same distance (the distance to the Pleiades star cluster), so it is really a plot of absolute brightness versus color. This is the H-R Diagram.
How is the temperature of stars determined by?
(1) A star’s surface temperature can be determined from its spectrum. and max = wavelength of maximum emission (measured in meters). Cool stars (such as Betelgeuse, which has a surface temperature of T = 3500 Kelvin) emit more red and orange light than blue and violet light. Thus, cool stars are red.
How does the temperature and luminosity of the Sun compare to that of other stars on the main sequence?
Why it is possible to relate the temperature of a star to its luminosity or brightness?
If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off. Temperature also affects a star’s luminosity. As a star gets hotter, the number of nuclear reactions increases.