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

During the Main Sequence phase, core hydrogen fusion creates the pressure (in the form of radiation pressure and thermal pressure) that maintains hydrostatic equilibrium in a star, so you should expect that when a star’s core has become filled with helium and inert, the star will fall out of equilibrium.

Greater gravity compresses the gas, making it denser and hotter, so the outward pressure increases. In any given layer of a star, there is a balance between the thermal pressure (outward) and the weight of the material above pressing downward (inward). This balance is called hydrostatic equilibrium.

Subsequently, question is, what is hydrostatic equilibrium are main sequence stars in hydrostatic equilibrium name which forces are at play? 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.

Beside this, which stage best represents a Subgiant star?

Stage iv is the subgiant stage, when the star has exhausted its core hydrogen and fuses hydrogen in a shell around the core. This stage is not its longest stage of life. This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death.

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.

Is the moon in hydrostatic equilibrium?

Planetary geology Often the equilibrium shape is an oblate spheroid, as is the case with Earth. The smallest body confirmed to be in hydrostatic equilibrium is the dwarf planet Ceres, which is icy, at 945 km, whereas the largest body known to not be in hydrostatic equilibrium is the Moon, which is rocky, at 3,474 km.

What keeps a star in equilibrium?

The inward force of gravity is balanced out by the outward force of pressure to keep the star stable. This stable balance, the outward pressure of hot gases balancing the inward pull of gravity is called the hydrostatic equilibrium.

What is the hydrostatic equation?

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 forces hold a star together in stellar equilibrium?

A star is in equilibrium when the pressures inside the star balance out the force of gravity. The pressure is thermal pressure resulting from the fusion reactions taking place in the star’s core. A star stays in equilibrium until the supply of hydrogen in the core is depleted.

Where does hydrostatic pressure come from?

Hydrostatic pressure is the pressure that is exerted by a fluid at equilibrium at a given point within the fluid, due to the force of gravity. Hydrostatic pressure increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above.

In which stage of a star’s evolutionary cycle does it spend the most time?

If the star is big enough to fuse hydrogen atoms into helium, it will enter the phase that our Sun is in, called the main sequence phase. A star will enjoy most of its life in the main sequence phase. At this point nuclear fusion is turning hydrogen into helium.

What two forces keep the sun in hydrostatic equilibrium?

Hydrostatic equilibrium is the state where the force of gravity pulling inward is balanced by pressure pushing outward. In the core of the Sun, hydrogen is being fused into helium via nuclear fusion.

Which must be true for the equilibrium state of stars like our sun to be maintained?

Which must be true for the equilibrium state of stars like our sun to be maintained? The inner layers of the star must be hotter than the outer layers. If the star becomes too hot, it will expand until it cools enough to regain equilibrium. A change in pressure will be balanced by a corresponding change in temperature.

What is the birth of a star called?

All stars are born from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Once a star like the Sun has exhausted its nuclear fuel, its core collapses into a dense white dwarf and the outer layers are expelled as a planetary nebula.

What is a star’s life cycle?

A star’s life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star’s mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. The outer shell of the star, which is still mostly hydrogen, starts to expand.

What is the death of a star called?

When a high-mass star has no hydrogen left to burn, it expands and becomes a red supergiant. While most stars quietly fade away, the supergiants destroy themselves in a huge explosion, called a supernova. The death of massive stars can trigger the birth of other stars.

Which color are the hottest stars?


What stage of life is our sun in?

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.

How is a star formed step by step?

Star Formation Shapes the Appearance of the Universe and Provides the Sites for Planets. Step 1: initial collapse of an interstellar cloud. Step 2: the cloud fragments into clumps . The fragmentation is related to turbulence in the collapsing cloud. ( Step 3: The clumps collapse into a stars.