Respuesta :
The rarest type of stars is those that are more than 50 solar masses.
How are stars categorized?
Stars are categorized on the basis of mass, spectral behavior, and temperature.
There are 7 spectral types of stars:
- O-type (Blue) stars have more than 50 times the solar mass of the sun and are the rarest main sequence stars present in the universe. Their abundance is merely 0.000001% of known stars.
- B-type (Blue) stars have 10 times the solar mass of the sun with a surface temperature of over 20,000 K and their abundance is 0.1% of known stars.
- A-type (Blue) stars have 2 times the solar mass of the sun with a surface temperature of 8500 K. Their abundance is 0.7% of known stars.
- F-type (Blue/white) stars have 1.5 times the solar mass of the sun with a surface temperature of 6500 K. Their abundance is 2% of known stars.
- G-type (White/yellow) stars have 1 times the solar mass of the sun with a surface temperature of 5700 K. Their abundance is 3.5% of known stars.
- K-type (Orange/red) stars have 0.7 times the solar mass of the sun with a surface temperature of 4500 K. Their abundance is 8% of known stars.
- M-type (Red) stars have 0.2 times the solar mass of the sun with a surface temperature of 3200 K. Their abundance is 80% of known stars.
Thus, the rarest type of stars are the O-type stars that have more than 50 times the solar mass of the sun.
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