Population I stars include the sun and tend to be luminous, hot and young, concentrated in the disks of spiral galaxies. … 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 the difference between population I stars and Population II stars describe each and identify their differences 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.
What is the difference between a population I II and III star?
By definition, each population group shows the trend where decreasing metal content indicates increasing age of stars. Hence, the first stars in the universe (very low metal content) were deemed Population III, old stars (low metallicity) as Population II, and recent stars (high metallicity) as Population I.
What is the difference in composition between population I and Population II stars which populations probably formed first and how do you know?
Population I consists of younger stars, clusters, and associations—i.e., those that formed about 1,000,000 to 100,000,000 years ago. … Population II consists of the oldest stars and clusters, which formed about 1,000,000,000 to 15,000,000,000 years ago.What is the difference between population I and Population II stars in terms of chemical composition?
Population I stars are younger stars found in the disk of the galaxy that contain lots of atoms heavier than helium (metals). Population II stars are older, metal-poor stars found in a galaxy’s nuclear bulge, halo, and globular clusters.
How are Population II stars different than the sun a population I star group of answer choices?
How are population II stars different than the sun, a population I star? Population II stars are lower in heavy elements (metals) than population I stars. lobular clusters. We estimate the mass of the galaxy by observations of its ________ curve.
What is the difference between population I stars and Population II stars?
Population I stars are relatively young stars which have formed within the last few billion years. Extreme Population I stars (the most metal rich stars) are found only in the spiral arms; these are the youngest stars. … Population II stars are metal poor stars; they contain about 0.1 percent metals.
What are Population II 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.Which of the following is not a difference between spiral and elliptical galaxies?
Which of the following is NOT a difference between spiral and elliptical galaxies?” Your answer : Spiral galaxies are younger, whereas elliptical galaxies are older. Correct! While spiral galaxies contain younger stars, they also contain older stars.
Why do we think Population II don't have any heavy metals?Since light metals are produced primarily in Type II supernova explosions (the explosions of massive stars which have lifetimes of only a few million years), while the heavier elements can only be produced in Type Ia supernova explosions (the explosion of a much older white dwarf in a binary system), the relative lack …
Article first time published onWhat distinguishes the different stellar populations in our galaxy?
We now know that the populations differ not only in their locations in the Galaxy, but also in their chemical composition, age, and orbital motions around the center of the Galaxy.
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.
Is Sun a third generation star?
Our Sun, by any metric, is at least a third-generation star, but is probably made up of a variety of materials that have existed in multiple generations of stars of unequal properties.
Is circular orbits population 1 or 2?
Stars less than 100 million years old are found in the spiral arms within 400 light years of the disk plane. They have circular orbits and metal abundances of 1 to 2.5 times solar abundance. The Population II stars inhabit the spheroidal component (the stellar halo and bulge).
How do the contents of the halo and disk of our galaxy differ?
(29) How do the contents of the halo and disk of our galaxy differ? a. The halo has more dust and young stars than the disk.
Which of the following is not true about Population I stars?
What is not true of Population I stars? They are old. We can see it in dark clouds and clouds that absorb light. The matter creates narrow absorption lines in the spectra of some stars.
Which of the following statements correctly summarize key differences between the disk and the halo check all that apply?
Which of the following statements correctly summarize key differences between the disk and the halo? Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have more randomly oriented orbits. … Clusters of young stars are found only in the disk.
What do you mean by stellar population?
Stellar Populations: A group of stars within the Galaxy that resemble each other in spatial distribution, chemical composition or age are called a stellar population. … The disk contains all the gas and young stars, although old stars are also found there. The bulge is dominated by old stars and a violent core.
Why are metal rich stars redder?
Opacity: more metals absorb energy from the interior of the star, making red giants “swell up” even more, and give them cooler (redder) temperatures.
What is the difference between an E6 galaxy and an E2 Galaxy Group of answer choices?
A galaxy with the designation “E6” would be ( more / less ) elongated than a type “E2” galaxy. A galaxy with the designation “Sa” is a(n) ( spiral / elliptical ) galaxy that ( does / does not ) have a bar. It has a ( large / small ) nuclear bulge and ( loosely- / tightly- ) wound arms.
What is the difference between an SBb galaxy and an SB galaxy?
An SBb galaxy has spiral arms spring from the ends of a bar, expanding out from the nucleus. An SBb galaxy has more hot, bright stars, but less gas and dust. An Sb galaxy has more hot, bright stars and more gas and dust.
Why do the halo stars have different orbits than the stars in the spiral arms?
Halo stars have different orbits, so when they pass through the disk they have high speeds relative to the nearby disk stars.) What evidence suggests that most of the mass of the Milky Way is in the form of dark matter? The orbital speeds of stars far from the galactic center are surprisingly high.
What are the main 3 differences between elliptical and spiral galaxies?
Spiral galaxies have a flat disk like shape and a bulging center with spiral arms consisting the disk. Elliptical galaxies are ellipsoids with no clearly visible internal structure. Spiral galaxies have a very dense nucleus and a region of stars bulging outwards from the disks and, therefore, called the central bulge.
What are the differences between elliptical and spiral galaxies?
Spiral galaxies have a central bulge of stars surrounded by a disk that contains arms, which form a spiral structure. … Elliptical galaxies don’t show any structure, but have a smooth ellipsoidal shape, appearing as a large spherical or elliptical ball of stars.
What could be the key difference in the way spiral and elliptical galaxies formed?
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren’t nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born.
Which type of galaxy contains the most Population II stars?
In fact, elliptical galaxies contain primarily old, red stars (also known as Population II stars). Elliptical galaxies vary widely in size. Both the largest and the smallest known galaxies are elliptical. Very large elliptical galaxies can reach 300 million light years in diameter.
What makes up most of the mass in our galaxy?
As with many contemporary mysteries in astronomy, the answer is dark matter. The Milky Way is thought to be home to a halo of dark matter – matter that cannot be detected except through its gravitational influence – which makes up approximately 80-90% of its mass.
What is the difference between stars in spiral arms and globular clusters quizlet?
The spiral arms contain many hot young stars and therefore is luminous. … The clusters found in the halo are globular clusters (approximately 100 of them), so the halo is population II, and contains very old stars.
What are the characteristics of a population II star?
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.
Is there a black hole in the Milky Way?
The Milky Way’s supermassive black hole, known as Sagittarius A* (Sgr A*), is over 4 million times more massive than our sun. Its strong gravitational pull draws nearby stars and gas clouds into its accretion disk.
What color is an old star?
As stars age, they run out of hydrogen to burn, decreasing the amount of energy they emit. Thus, younger stars can appear bluer while older ones appear more red, and in this way, a star’s color can tell us something about that star’s age.
