Give ALL correct answers referring to the properties of known stars, i.e., B, AC, BCD... A) On the main sequence, more massive stars are colder. B) High mass stars are the most numerous type of stars observed in the galaxy. C) Giants are colder than main sequence stars at the same luminosity. D) Giants are brighter than dwarfs at the same temperature. E) On the main sequence, more massive stars are dimmer. F) White dwarf stars are much denser than main sequence stars. Hint: White dwarf stars have about the mass of our sun, but are only the size of the Earth. Therefore, they have a very high density.
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
- Give ALL correct answers referring to the properties of known stars, i.e., B, AC, BCD...
- A) On the main sequence, more massive stars are colder.
- B) High mass stars are the most numerous type of stars observed in the galaxy.
- C) Giants are colder than main sequence stars at the same luminosity.
- D) Giants are brighter than dwarfs at the same temperature.
- E) On the main sequence, more massive stars are dimmer.
- F) White dwarf stars are much denser than main sequence stars.
Hint: White dwarf stars have about the mass of our sun, but are only the size of the Earth. Therefore, they have a very high density.
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