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What else can I help you with?
What is the lifetime on the main sequence of a 2 solar mass star?
not very long because its about to supernova,,,,,,,,, i think again
What is a main sequence star with less than 0.4 solar masses?
A main sequence star with less than 0.4 solar masses would be classified as a red dwarf star. These stars are the smallest and coolest main sequence stars, with longer lifespans compared to higher mass stars. They are the most common type of star in the universe.
Size of main sequence star?
A main sequence star is NOT a TYPE of star but a period in a stars evolution. Therefore all stars from the hottest to the coolest are on the main sequence at some stage - with the exception of brown dwarfs which do not reach the main sequence.
Will the K-type Epsilon Eridani star eventually evolve into a G-type main sequence star like the Sun?
No. A star's class on the main sequence is ultimately predetermined by its mass, so a star cannot change its position on the main sequence. Epsilon Eridani is about 82% the mass of the sun, which limits it to a lower rate of fusion and thus a lower temperature and luminosity than a G-type star like the sun. Epsilon Eridani's only change in class will come when it leaves the main sequence to become a red giant.
How is the evolution of a main-sequence star with less than 0.4 M fundamentally different from that of a main-sequence star with more than 0.4 M?
Main-sequence stars with mass less than 0.4M convert all of their mass into helium and then stop fusing. Their lifetimes last hundreds of billions of years, so none of these stars has yet left the main sequence. Core hydrogen fusion ceases when hydrogen in the core of a main-sequence star with more than 0.4M is gone, leaving a core of nearly pure helium surrounded by a shell where hydrogen fusion continues. Hydrogen shell fusion adds more helium to the star's core, which contracts and becomes hotter. The outer atmosphere expands considerably, and the star becomes a giant. Comments: I guess 0.4M means 0.4 solar masses. Usually the "M" has an extra little symbol next to it when it means this. Also I'm not sure that there's an exact number you can put on the division between these two types of star. I could argue with the details in the answer, but I have not got the time. Anyway the basic idea seems correct.
When a protostar of about one solar mass contracts and becomes hotter what position will it shift into?
Main sequence.
Is Sirius A a main sequence star?
Polaris - the current North star is a multiple star system., consisting of the main star and smaller companions. The main star Alpha Ursae Minoris is a bright star, a 6 solar mass supergiant and it is a main sequence star. Orbiting very close to this main star is a white dwarf of roughly 1.5 solar masses. This is not a main sequence star. Orbiting further out is the third companion, a 1.39 solar mass star. This is a main sequence star. There are also two more distant components (α UMi C and α UMi D) - Polaris is thought to be part of an open cluster - I do not know if these later two stars are main sequence or not.
What is the lifetime on the main sequence of a 2 solar mass star?
not very long because its about to supernova,,,,,,,,, i think again
What current stage of stellar evolution is Sirius?
Sirius consists of two stars.Sirius A is a main-sequence star with about two solar masses.Sirius B is a white dwarf with about one solar mass. During its main-sequence, it's estimated to have been around five solar masses.
What is a main sequence star with less than 0.4 solar masses?
A main sequence star with less than 0.4 solar masses would be classified as a red dwarf star. These stars are the smallest and coolest main sequence stars, with longer lifespans compared to higher mass stars. They are the most common type of star in the universe.
Size of main sequence star?
A main sequence star is NOT a TYPE of star but a period in a stars evolution. Therefore all stars from the hottest to the coolest are on the main sequence at some stage - with the exception of brown dwarfs which do not reach the main sequence.
How many years do spectral class O5 stars remain on the main sequence?
Spectral class O5 stars remain on the main sequence for around 3-4 million years before they evolve off the main sequence stage. These stars have extremely high luminosities and temperatures, leading to a short main sequence lifetime compared to lower mass stars.
Is the sun a low mass or high mass star and which stage is it in?
The Sun is a medium mass star in main sequence.
Will the K-type Epsilon Eridani star eventually evolve into a G-type main sequence star like the Sun?
No. A star's class on the main sequence is ultimately predetermined by its mass, so a star cannot change its position on the main sequence. Epsilon Eridani is about 82% the mass of the sun, which limits it to a lower rate of fusion and thus a lower temperature and luminosity than a G-type star like the sun. Epsilon Eridani's only change in class will come when it leaves the main sequence to become a red giant.
Why do stars evolve off of the main sequence?
Because they have exhausted their supply of hydrogen in the core. They might reenter the main sequence later, but that will be using hydrogen in the shell (the branch phase) rather than the core.
How is the evolution of a main-sequence star with less than 0.4 M fundamentally different from that of a main-sequence star with more than 0.4 M?
Main-sequence stars with mass less than 0.4M convert all of their mass into helium and then stop fusing. Their lifetimes last hundreds of billions of years, so none of these stars has yet left the main sequence. Core hydrogen fusion ceases when hydrogen in the core of a main-sequence star with more than 0.4M is gone, leaving a core of nearly pure helium surrounded by a shell where hydrogen fusion continues. Hydrogen shell fusion adds more helium to the star's core, which contracts and becomes hotter. The outer atmosphere expands considerably, and the star becomes a giant. Comments: I guess 0.4M means 0.4 solar masses. Usually the "M" has an extra little symbol next to it when it means this. Also I'm not sure that there's an exact number you can put on the division between these two types of star. I could argue with the details in the answer, but I have not got the time. Anyway the basic idea seems correct.
What is the life expectancy of life of a star?
A 16.0 solar mass star would spend about 11.7 million years on the main sequence (depending on the metallicity). After approximately 13.0 million years it would become a 1.5 solar mass (approx.) neutron star. This was calculated using metallicity z=0.02 (solar)
