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If you are referring to the Yerkes spectral classification, a Class IV star is known as a subgiant.

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What is the luminosity of the star Procyon?

The luminosity of the star Procyon is approximately 7.9 times that of the Sun. It is classified as a type F5 IV-V star with a visual magnitude of 0.34, making it one of the brightest stars in Earth's night sky.


What type of star is Acrux?

Acrux (Alpha Crucis) is not a single star, what we know of it makes two stars visible (A1 and A2). Both stars are Class B, pushing Class O (blue-white to blue). A1 is a B0.5IV (B=blue-white class, 0.5=temperature range {0 being hottest, 9 being coolest}, IV puts A1 in the sub-giant range. A2 is a B1V, the same B class, however it is cooler than A1 and much smaller, V-making it a dwarf.So, B is the color from the Harvard Spectral Classification. The number is a subdivision of the Harvard Spectral Classification and addresses temperature and luminosity. The Roman numeral is the Yerkes Spectral Classification and addresses the size and luminosity (broken into 8 divisions from hypergiants to white dwarfs).


What type of star is Delta Geminorum?

Delta Geminorum (Wasat) is a ternary system (i.e it consists of three stars). The visible part is a spectroscopic binary consisting of two stars of spectral type approximately F1 with combined luminosity class IV-V, orbiting each other very closely. This is orbited by a smaller and less luminous companion of spectral class K3 V, at a distance of about 126 light-years, with a period of about 1200 years.


What are the 7 ways a star can be classified?

Stars can be classified based on their spectral type (O, B, A, F, G, K, M), luminosity class (I, II, III, IV, V), temperature, size, mass, age, and chemical composition. These classifications help astronomers understand the different characteristics and behaviors of stars.


What are the two ways stars are classified?

Stars are classified based on their spectral characteristics, which categorizes them into spectral types (O, B, A, F, G, K, M) based on the temperature of their surface. They are also classified based on their luminosity, which categorizes them into different classes (I, II, III, IV, V) based on their brightness compared to the Sun.

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What is the luminosity of the star Procyon?

The luminosity of the star Procyon is approximately 7.9 times that of the Sun. It is classified as a type F5 IV-V star with a visual magnitude of 0.34, making it one of the brightest stars in Earth's night sky.


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What type of star is Alhena?

Gamma Geminorum (Alhena) is the second brightest star in the constellation Gemini.It has a spectral type of A1 so it has a temperature of the upper of 7,500-10,000 K and will appear white-blue.It is on the main sequence but is on the evolving stage where it will enter a sub giant stage.So in astronomical terms it is slowly dieing but don't expect to see any change.