Table of Contents
- 1 Is a blue giant bigger than a red giant?
- 2 How are red giants and blue giants different?
- 3 Are blue or red giants hotter?
- 4 Do blue stars become red giants?
- 5 Is there a green Sun?
- 6 Which is larger a red giant or a blue giant?
- 7 Which is bigger a red star or a blue star?
- 8 What kind of stars are in the blue giant region?
Is a blue giant bigger than a red giant?
They are larger than the Sun but smaller than a red supergiant, with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times that of the Sun.
How are red giants and blue giants different?
Essentially, the differences between a blue giant and a red giant are the age of the stars and their permanence. No blue giant remains a blue giant; it eventually will turn into a red giant.
Are blue Giants the biggest stars?
Blue giant stars are relatively small Typically, a blue giant star would have an absolute magnitude of about 0 and brighter, and be about twice as massive as the Sun, while typically being only about 5 to 10 times bigger.
Are blue or red giants hotter?
The color of a star is defined by its temperature. The coolest stars are red, while the hottest stars are blue. Blue giant stars are very hot, with surface temperatures of 20,000-50,000 Kelvin. Just for comparison, our own Sun is only 6,000 Kelvin.
Do blue stars become red giants?
In the simplest case, a hot luminous star begins to expand as its core hydrogen is exhausted, and first becomes a blue subgiant then a blue giant, becoming both cooler and more luminous. Intermediate-mass stars will continue to expand and cool until they become red giants.
What is a blue Sun called?
Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 – 50,000 degrees Celsius. The best known example is Rigel, the brightest star in the constellation of Orion.
Is there a green Sun?
The Sun can sometimes appear as a green spot for a second or two as it is rising or setting: this is known as green flash. Roughly speaking, the red light from the Sun is blocked by Earth, the blue light is scattered by the atmosphere, and the green light is refracted by the atmosphere to the observer.
Which is larger a red giant or a blue giant?
Blue giants are larger and hot. Blue giants are also very hot, and are quite rare compared to other starts. Orange giants are stars that are sized between blue and red giants. The star called Pollux is an orange giant, with the orange colour indicating that the surface temperature of the star is lower than that of a main-sequence star.
Can a red dwarf star become a blue giant?
A red dwarf star, when it expands to become a giant, will never become a blue giant. An O-type star, on the other hand, is massive enough and hot enough that when it expands it will still be blue, and become a blue giant (or a blue hypergiant).
Which is bigger a red star or a blue star?
Not all big stars are red, either. In fact, on the main sequence, the opposite is true – the larger and more massive a star is, the more blue it becomes. The hottest and brightest of the bunch, the O-Type stars, have masses that are 15 – 90 times
What kind of stars are in the blue giant region?
Stars found in the blue giant region of the HR diagram can be in very different stages of their lives, but all are evolved stars that have largely exhausted their core hydrogen supplies.