H-R Diagram (above)
Arcturus in the Main Sequence
The Basic Parts Of All Stars:
The main parts of a star are known as the, Convective and Radiative Zones, the Photosphere, the Chromosphere, and the Corona. Vast clouds of gas and dust are swirling throughout our Milky Way galaxy. Many of these clouds are stellar nurseries, places where one to tens of thousands of stars (in the case of the largest and most massive clouds) are being born right now. These clouds range in size from cores that are 100,000 times the size of the Solar System and mass of several Suns (solar masses), to giant clouds more than ten million times the size of our Solar System and many thousands to tens of thousands of solar masses. A typical star-forming cloud might create a very few massive stars, many stars like our Sun, and many more lower-mass stars and brown dwarfs, which are objects of mass well smaller than that needed to produce star fueled by nuclear fusion.
Why Arcturus Is Not Expanding In The Main Sequence Phase:
Arcturus is late into its lifespan, and therefore it is expanding mostly because of the fact that it is a Red Giant. Because most likely at its death it shall completely die out and expand to the point that it explodes the entire outer layers of the Star leaving the core behind. All of the energy within a star is constantly moving about, but it is also being burned and expanding out. There is a non-stop fight between gravity and the force pushing the energy out of the core. Most of the energy is in the core of the star, but it is constantly moving around and moving out away from the core.
Arcturus is a red giant because of the size and brightness. When red stars run out of fuel it will expand. So when Arcturus runs out of fuel, it will expand and maybe even destroy the planets and objects that orbit it when it dies. Considering that a red giant is a star deep into its timeline, our star Arcturus will die sooner than our star, and expand into the rest of its solar system. Scientist are guessing from the expansion rate, and the brightness of the star Arcturus, it only has about 7.2 billion years left in its lifetime. According to sources, Arcturus has already lived about 8 billion years old, giving it a total lifetime of 15 - 16 billion years.
Citations: http://amazingarcturus.weebly.com/main-sequence.html
The main parts of a star are known as the, Convective and Radiative Zones, the Photosphere, the Chromosphere, and the Corona. Vast clouds of gas and dust are swirling throughout our Milky Way galaxy. Many of these clouds are stellar nurseries, places where one to tens of thousands of stars (in the case of the largest and most massive clouds) are being born right now. These clouds range in size from cores that are 100,000 times the size of the Solar System and mass of several Suns (solar masses), to giant clouds more than ten million times the size of our Solar System and many thousands to tens of thousands of solar masses. A typical star-forming cloud might create a very few massive stars, many stars like our Sun, and many more lower-mass stars and brown dwarfs, which are objects of mass well smaller than that needed to produce star fueled by nuclear fusion.
Why Arcturus Is Not Expanding In The Main Sequence Phase:
Arcturus is late into its lifespan, and therefore it is expanding mostly because of the fact that it is a Red Giant. Because most likely at its death it shall completely die out and expand to the point that it explodes the entire outer layers of the Star leaving the core behind. All of the energy within a star is constantly moving about, but it is also being burned and expanding out. There is a non-stop fight between gravity and the force pushing the energy out of the core. Most of the energy is in the core of the star, but it is constantly moving around and moving out away from the core.
Arcturus is a red giant because of the size and brightness. When red stars run out of fuel it will expand. So when Arcturus runs out of fuel, it will expand and maybe even destroy the planets and objects that orbit it when it dies. Considering that a red giant is a star deep into its timeline, our star Arcturus will die sooner than our star, and expand into the rest of its solar system. Scientist are guessing from the expansion rate, and the brightness of the star Arcturus, it only has about 7.2 billion years left in its lifetime. According to sources, Arcturus has already lived about 8 billion years old, giving it a total lifetime of 15 - 16 billion years.
Citations: http://amazingarcturus.weebly.com/main-sequence.html