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What factors determine stellar structure?

What is the stellar theory?

Stars are the basic building blocks of the visible Universe and produce almost all chemical elements heavier than helium. Understanding how stars transformed the pristine Universe into the one we live in today is at the heart of research in astrophysics.

What factors determine stellar structure?

The primary factor determining how a star evolves is its mass as it reaches the main sequence. The following is a brief outline tracing the evolution of a low-mass and a high-mass star. Stars are born out of the gravitational collapse of cool, dense molecular clouds.

What is the basic structure of a star?

The structure of a star can often be thought of as a series of thin nested shells, somewhat like an onion. A star during most of its life is a main-sequence star, which consists of a core, radiative and convective zones, a photosphere, a chromosphere and a corona.Jul 19, 2017

What is the life cycle of a star?

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. All stars, irrespective of their size, follow the same 7 stage cycle, they start as a gas cloud and end as a star remnant.

image-What factors determine stellar structure?
image-What factors determine stellar structure?
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What happens when a star dies?

Stars die because they exhaust their nuclear fuel. ... Once there is no fuel left, the star collapses and the outer layers explode as a 'supernova'. What's left over after a supernova explosion is a 'neutron star' – the collapsed core of the star – or, if there's sufficient mass, a black hole.

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What are the 7 main types of stars?

Scientists classify stars by temperature and the elements they absorb, which are called their spectra. They have divided stars into seven main types. There are seven main types of stars: O, B, A, F, G, K and M. The O stars are the bright, hot, blue stars and the M stars are the dimmer, cooler, red stars.Aug 19, 2021

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Are stars convective?

Stellar convection consists of mass movement of plasma within the star which usually forms a circular convection current with the heated plasma ascending and the cooled plasma descending. The Schwarzschild criterion expresses the conditions under which a region of a star is unstable to convection.

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What is the name of our galaxy?

Astronomy > The Milky Way Galaxy. Did you know that our star, the Sun, is just one of hundreds of billions of stars swirling within an enormous cosmic place called the Milky Way Galaxy? The Milky Way is a huge collection of stars, dust and gas.

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Why are metal rich stars redder?

We discussed this before: if the atmosphere of a star contains more metals, then the dust and the gas will scatter preferentially the blue light hence the stars appears redder.

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What is the stellar spectrum?

A star's spectrum contains information about its temperature, chemical composition, and intrinsic luminosity. Spectrograms secured with a slit spectrograph consist of a sequence of images of the slit in the light of the star at successive wavelengths.

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How are stars created and destroyed?

Stars begin their life cycle as a nebula. For 50 million years, gas and dust collapses under its own gravity and heats up from friction. Once the temperature and pressure is right for nuclear fusion, the star ignites. Hydrogen is fused into helium.Oct 10, 2013

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What were the elements formed during the stellar evolution and formation?

During the formation of the universe some 14 billion years ago in the so-called 'Big Bang', only the lightest elements were formed – hydrogen and helium along with trace amounts of lithium and beryllium.Oct 22, 2009

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What elements formed stellar evolution?

Incredibly massive stars continue fusion from helium until they create iron (Fe) in their core. In this fusion process, these massive stars create neon (Ne), magnesium (Mg), oxygen (O), sulfur (S), silicon (Si) and finally iron (Fe).

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