What are population 1 and 2 stars?
Populations I and II, in astronomy, two broad classes of stars and stellar assemblages defined in the early 1950s by the German-born astronomer Walter Baade. The members of these stellar populations differ from each other in various ways, most notably in age, chemical composition, and location within galactic systems.
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.
Which kind of star is most likely to be part of the spheroidal population?
Cards
| Term Stars that orbit on nearly the same plane | Definition disk stars |
|---|---|
| Term Which kind of star is most likely to be part of the spheroidal population? | Definition an M star |
| Term We measure the mass of the black hole at the galactic center from: | Definition the orbits of stars in the galactic center. |
Do older stars have heavier elements?
Each succeeding generation of stars therefore contains a larger proportion of elements heavier than hydrogen and helium.
Why do older stars have lower heavy element abundances?
Every time a massive star burns out and dies in a supernova, it releases clouds of gas and newly formed elements out into space, where the gas clouds contract again and finally collapse and form new stars. As a result, new generations of stars have a larger ratio of heavy elements than the previous generation.
What are old stars?
Most stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.8 billion years old—the observed age of the universe. The oldest star yet discovered, HD 140283, nicknamed Methuselah star, is an estimated 14.46 ± 0.8 billion years old.
When stars die what happens?
When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. This may be millions of kilometres across – big enough to swallow the planets Mercury and Venus. After puffing off its outer layers, the star collapses to form a very dense white dwarf.
What are the very large stars called?
Stars still more luminous than giants are referred to as supergiants and hypergiants. A hot, luminous main-sequence star may also be referred to as a giant, but any main-sequence star is properly called a dwarf no matter how large and luminous it is.
What classification of star is the coolest?
The spectral sequence is also a colour sequence: the O- and B-type stars are intrinsically the bluest and hottest; the M-, R-, N-, and S-type stars are the reddest and coolest.
What are characteristics of giant stars?
Giant star, any star having a relatively large radius for its mass and temperature; because the radiating area is correspondingly large, the brightness of such stars is high.