During which stages of a stars life is the star in hydrostatic equilibrium

A star is in hydrostatic equilibrium when the outward push of pressure due to core burning is exactly in balance with the inward pull of gravity. When the hydrogen in a star’s core has been used up, burning ceases, and gravity and pressure are no longer in balance.

During which stages of a stars life is the star in hydrostatic equilibrium?

Stellar classRadius, R/ R ☉Temp. (K)F51.26,540G01.055,920G215,780G50.935,610

Are main sequence star in hydrostatic equilibrium?

All main sequence stars (including the Sun) are in hydrostatic equilibrium. That is, the inward force of gravity, which tends to compress the star, is balanced by the outward force due to the pressure. … Consider taking a star and increasing its mass by pouring a little extra hydrogen gas onto it.

What does it mean if a star is in hydrostatic equilibrium?

A star is “in hydrostatic equilibrium” when it is not collapsing or expanding. Page 7. Inside a star the weight of the matter is supported by a gradient in the pressure. If the pressure on the top and bottom of a layer were exactly the same, the layer would fall because of its weight.

What are the stages of a star life cycle?

Stars come in a variety of masses and the mass determines how radiantly the star will shine and how it dies. Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white dwarf surrounded by a disappearing planetary nebula.

What is hydrostatic equilibrium in a star quizlet?

A star is in hydrostatic equilibrium when the outward push of pressure due to core burning is exactly in balance with the inward pull of gravity. When the hydrogen in a star’s core has been used up, burning ceases, and gravity and pressure are no longer in balance. This causes the star to undergo significant changes.

What are the stages of the star How did a star form?

Stage 1- Stars are born in a region of high density Nebula, and condenses into a huge globule of gas and dust and contracts under its own gravity. This image shows the Orion Nebula or M42 . Stage 2 – A region of condensing matter will begin to heat up and start to glow forming Protostars.

How is hydrostatic equilibrium derived?

In equilibrium, this force is balanced by an outward pressure force acting at r and r+dr (P = dF/dA) dFP = [P(r) − P(r + dr)] dA = − dP dr drdA, (9.2) by using the definition of the derivative. Figure 9.1: Schematic for deriving hydrostatic equilibrium.

Which describes the star cycle of a star like our Sun?

A star like our Sun will become a white dwarf when it has exhausted its nuclear fuel. Near the end of its nuclear burning stage, such a star expels most of its outer material (creating a planetary nebula) until only the hot (T > 100,000 K) core remains, which then settles down to become a young white dwarf.

When a star loses its hydrostatic equilibrium the star becomes?

The Fate of Medium-Sized Stars Once the helium in the core is gone, the star will shed most of its mass, forming a cloud of material called a planetary nebula. The core of the star will cool and shrink, leaving behind a small, hot ball called a white dwarf.

Article first time published on

What happens as a star ages and leaves the main sequence?

When the stars go out Eventually, a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle. At this point, it leaves the main sequence. … Then the pressure of fusion provides an outward thrust that expands the star several times larger than its original size, forming a red giant.

What will happen if a star is not in hydrostatic equilibrium?

Ask class: what would happen if an object were dramatically out of hydrostatic equilibrium? It would then evolve dynamically. … If gravity is unopposed, then the object will collapse or explode, on roughly a free-fall time scale.

In which stage do stars spend most of their life?

Stars live out the majority of their lives in a phase termed as the Main Sequence. Once achieving nuclear fusion, stars radiate (shine) energy into space.

At which of the first five labeled stages is the star in energy balance quizlet?

At which of the first five labeled stages is the star in energy balance? The star is in energy balance when its core energy production matches the amount of energy it radiates into space.

Which stars leave the main sequence first?

The most luminous and massive stars, found in the upper left part of the main sequence, are the first to leave the main sequence; their turnoff point in the H-R diagram can be used to clock the age of the star cluster.

What are the 5 stages of a star?

• A nebula. A star forms from massive clouds of dust and gas in space, also known as a nebula. …
• Protostar. As the mass falls together it gets hot. …
• Main sequence star. …
• Red giant star. …
• White dwarf. …
• Supernova. …
• Neutron star or black hole.

What are the three end stages of stars?

• White Dwarf.
• Neutrons Star.
• Black Hole.

What are the stages of a massive star's life?

Any star which is larger than eight solar masses during its regular main sequence lifetime is considered a massive star. They typically have a quick main sequence phase, a short red supergiant phase, and a spectacular death via a supernova explosion.

Which is the latest stage of a star?

A planetary nebula is the final stage of a Sun-like star. As such, planetary nebulas allow us a glimpse into the future of our own solar system. A star like our Sun will, at the end of its life, transform into a red giant. Stars are sustained by the nuclear fusion that occurs in their core, which creates energy.

Which of the following best describes hydrostatic equilibrium *?

Hydrostatic equilibrium, also known as gravitational equilibrium, describes a balance between gravity and pressure. Gravity works to contract while pressure works to expand.

During what period of a stars life does the thermal pressure balance gravity?

Once a star has achieved nuclear fusion in its core, it radiates energy into space. While the temperature-produced gas pressure balances gravity, the star attains a stable state and enters the main sequence phase of its life.

In what stage of the life cycle of the star does the sun belong?

The Main Sequence: The Sun, like most stars in the Universe, is on the main sequence stage of its life, during which nuclear fusion reactions in its core fuse hydrogen into helium.

Which phase of star life cycle is our Sun?

Like most stars in our universe, the Sun is on the main sequence stage of its life. This means nuclear fusion reactions in its core fused hydrogen into helium. However, this process cannot last forever since there is a finite amount of hydrogen in the core of the Sun.

Which of these lists the life stages of a Sun like star in the correct order?

The Sun’s lifecycle is nebula, main sequence star, red giant, white dwarf.

What is hydrostatic equilibrium in atmosphere?

In climate: Characteristics. The atmosphere is mainly in hydrostatic balance, or equilibrium, between the upward-directed pressure gradient force and the downward-directed force of gravity.

What is the protostar stage?

A protostar is a very young star that is still gathering mass from its parent molecular cloud. The protostellar phase is the earliest one in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years.

What are the common forms of the hydrostatic equation?

Lesson Summary The pressure in a liquid at a given depth is called the hydrostatic pressure. This can be calculated using the hydrostatic equation: P = rho * g * d, where P is the pressure, rho is the density of the liquid, g is gravity (9.8 m/s^2) and d is the depth (or height) of the liquid.

What happens during the stellar nebula stage?

Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin. As the gas spins faster, it heats up and becomes as a protostar. Eventually the temperature reaches 15,000,000 degrees and nuclear fusion occurs in the cloud’s core.

What does a star turn into when it dies?

Most stars take millions of years to die. … After puffing off its outer layers, the star collapses to form a very dense white dwarf. One teaspoon of material from a white dwarf would weigh up to 100 tonnes. Over billions of years, the white dwarf cools and becomes invisible.

What happens during the life cycle of a star with one stellar mass?

Explanation: All stars go trough a lifecycle and it’s life cycle is determined by its MASS – The larger the star, the faster it burns out! … 5) A star of one solar mass remains in main sequence for about 10 billion years, until all of the hydrogen has fused to form helium.

How do stars move along the main sequence?

Stars such as our Sun move off the main sequence and up the red giant branch (RGB), fusing hydrogen into helium in hydrogen shell burning. A very short helium flash sees the start of helium core fusion and the star moves along the horizontal branch (HB).