0
Does a low mass or high mass sequence star have higher fusion rate during main sequence life?
Wiki User
∙ 15y ago
A high mass star.
The temperature and density of the stars core are at the levels necessary to sustain the energy production that supports the remainder of the star. A reduction of energy production would cause the overlaying mass to compress the core, resulting in an increase in the fusion rate because of higher temperatures and pressure. Likewise, an increase in energy production would cause the star to expand, lowering the pressure at the core.
Thus the star forms a self regulating system in hydrostatic equilibrium that is stable over the course of its main sequence lifetime
The most massive stars may remain on the main sequence for only a few million years, while smaller stars may last for over a trillion years.
See link for detailed information.
See related questions for an overview.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
Which tides are higher then normal during a high tide low or high tides and why?
do you mean spring tide
Why does the temperature in the centers of stars have to be extremely high for fusion to occur?
fusion is called thermonuclear for a good reason: it needs a lot of heat to get started.
On what grounds are astronomers able to say that the sun has about 5 billion years remaining in its main sequence stage?
We can crunch numbers. The sun's energy output can be calculated with a high degree of accuracy, and its mass can be calculated accurately as well. We know how much energy a fusion reaction (the proton-proton reaction, for instance) releases. It's just a big numbers game, but one we can play with a high degree of certainty.
How is energy produced in the suns core?
By thermonuclear fusion of hydrogen, producing helium. The same process that produces the energy in a hydrogen bomb (although the sun fuses far more hydrogen in the same period of time than the largest hydrogen bomb ever speculated would fuse during its entire explosion, thus producing more energy than such a bomb).
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.
Which conditions are required to form 4 2he during the fusion reaction in the sun?
High Temp and high pressure
Nuclear fusion requires extremely high?
Nuclear fusion requires extremely high temperatures, and pressures.Nuclear fusion requires extremely high temperatures, and pressures.Nuclear fusion requires extremely high temperatures, and pressures.Nuclear fusion requires extremely high temperatures, and pressures.
What is a tidal sequence?
A tidal sequence is the order in which the tides of a day occur, with special reference to whether the higher high water immediately precedes or follows the lower low water.
Which tides are higher then normal during a high tide low or high tides and why?
do you mean spring tide
Why does the temperature stops rising during melting and boiling point?
Because the latent heat of fusion and latent heat of vaporization are very high
Does the onset of fusion reactions inside stars require high or low density and high or low temperature?
Starting the fusion reactions required high density and high heat.
What kind of nuclear power is responsible for sunshine?
Thermonuclear Fusion - Nuclear fusion brought about by high temperatures
What are facts about nuclear fusion?
Nuclear fusion releases huge amounts of energy. It occurs when the nuclei of elements are fused together at high temperatures and high pressure. Fusion energy is used to produce energy for some of the Earth's cities.
When a star is in its main-sequence stage does the center expand and then shrink?
No. While a Sun-type star is in its main sequence, the fusing core of the star is continually shrinking. This is because the hydrogen available to the fusion process is being depleted, even though the temperature is not yet high enough to initiate helium fusion. So the outward pressure generated by fusion decreases, causing the core to contract, causing the fusion process to intensify, paradoxically causing the star to heat up. In the Sun, this heating up is expected to produce 1% more luminosity every 110 million years or so. Meaning that about a billion years from now, the Earth will have become uninhabitable.
Nuclear fusion can only occur in areas of?
In areas of high temperature and high pressure
What two things are necessary for fusion reaction to take place in a star?
Fusion will ignite when the temperature and pressure are high enough.
What happened to economy during stagflation?
Higher rates of inflation, decrease in business productivity, high unemployment
