What are population 2 stars quizlet?
What are population 2 stars quizlet?
population II stars. stars poor in atoms heavier than helium ; relatively old stars nearly always found in the halo, globular clusters, or the central bulge. population I stars. stars with significant amounts of atoms heavier than helium; relatively young stars nearly always found in the galactic disk.
Where are Population II stars found quizlet?
Population II stars tend to be found in globular clusters and the nucleus of a galaxy. They tend to be older, less luminous and cooler than Population I stars.
What is a characteristic of Population II stars?
Population II stars tend to be found in globular clusters and the nucleus of a galaxy. They tend to be older, less luminous and cooler than Population I stars. They have fewer heavy elements, either by being older or being in regions where no heavy-element producing predecessors would be found.
What are Population I stars How do they differ from Population II stars quizlet?
Population I stars are usually the blue younger stars. They orbit in the disk and they are relatively rich in metals. Population II stars are the red, older stars that lies in the bulge and halo of the Galaxy. They orbits in the elliptical orbits in the halo.
Is the Milky Way spiral shaped?
The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy. These stars form a large disk whose diameter is about 100,000 light years. Our Solar System is about 25,000 light years away from the center of our galaxy – we live in the suburbs of our galaxy.
What happens when two spiral galaxies collide?
A: When two spiral galaxies collide, gravity is the main force that comes into play. As the galaxies approach each other, gravitational forces start to pull the stars, gas, and dust of the spiral arms out of their original orbits. During the merger, the stars become scattered and their orbits become random.
What is the difference between Population I and Population II stars?
Extreme Population I stars (the most metal rich stars) are found only in the spiral arms; these are the youngest stars. Intermediate Population I stars (like the Sun) are located through the disk. They are slightly less metal rich. Population II stars are metal poor stars; they contain about 0.1 percent metals.
What is the difference between population 1 and population 2 stars?
What are Population 3 stars?
Population III (Pop III) stars are composed entirely of primordial gas – hydrogen, helium and very small amounts of lithium and beryllium. These Pop III stars would then produce the metals observed in Pop II stars and initiate the gradual increase in metallicity across subsequent generations of stars.
What are the primary differences between population 1 and population 2 stars?
Why is the Milky Way spiral shaped?
Astronomers believe that galaxies have spiral arms because galaxies rotate – or spin around a central axis – and because of something called “density waves.” Stars pass through the wave as they orbit the galaxy center. The wave causes the stars to slow slightly and temporarily clump together.
Why does the galaxy swirl?
Spirals exist only among flattened or ‘disk’ galaxies. These galaxies are differentially rotating–that is, the time to complete a full rotation increases with distance from the center. Differential rotation causes any disturbance in the disk to wind up into a spiral form.
Where are population I and Population II stars found?
With the model of heavy element formationin supernovae, this suggests that the gas from which they formed had been seeded with the heavy elements formed from previous giant stars. About 2% of the total belong to Population I. Population II stars tend to be found in globular clusters and the nucleus of a galaxy.
How are population estimates based on the census?
The projections are based on a monthly series of population estimates starting with the April 1, 2010 resident population from the 2010 Census. At the end of each year, a new series of population estimates, from the census date forward, is used to revise the postcensal estimates, including the population clock projections series.
Which is the number one population in the world?
Country Rank. Country. Population 1. China 6. Nigeria 2. India 7. Brazil 3. United States 8. Bangladesh 4. Indonesia 9. Russia 5. Pakistan 10. Mexico The U.S. population clock is based on a series of short-term projections for the resident population of the United States.
Why do some stars have fewer heavy elements than others?
They have fewer heavy elements, either by being older or being in regions where no heavy-element producing predecessors would be found. Astronomers often describe this condition by saying that they are “metal poor”, and the “metallicity” is used as an indication of age.