There are several ways that Stars get classified.
The first is by spectrum, this was used early on in astronomy as astronomers did not have the equipment we have today. Basically they measure the visual spectrum of light that the stars give off to Earth.
The second method is using the letter system O B A F G K M. O being the hottest and M the coolest. O class stars contain helium, B class stars have hydrogen and helium, A class stars hydrogen and ionized metals, F class Stars hydrogen, ionized calcium, and iron, G class Stars (like our sun) calcium and ionized metals, k class stars neutral metals and sodium and M class Stars sodium and titanium oxide.
The third method is by is by temperature. They measure the heat it gives off and the amount that is absorbed by the materials around the star these are called absorption lines. This helps to determine what letter to give a Star.
The fourth is by colour. The the visual colour the star appears in the sky is not enough to just say its red or blue so they other measurements like infrared and other kinds of invisible light spectrum's.
And finally the elements that surround a star also differentiates what light is reflected back to earth. You combine all these methods together and you get how stars a classified.
The coolest stars are red in color. They are classified as red dwarfs and have surface temperatures ranging from about 2,500 to 3,500 degrees Celsius.
The weakest hydrogen line stars are classified as Class V in the Morgan-Keenan (MK) system of stellar classification. These stars have very weak or no hydrogen lines in their spectra, indicating low surface temperatures and the presence of strong molecular absorption bands. Class V stars are typically red or brown dwarf stars.
Both white dwarfs and neutron stars match the description. Neutron stars are smaller, hotter, and denser.
The hottest stars are classified as O-type stars, which are blue and have surface temperatures of around 30,000-60,000 degrees Celsius. These stars emit a lot of ultraviolet light, making them one of the most energetic types of stars.
it has to be at least 2 or more stars to be a star system.
They are usually classified by their temperature.
What are some ways the stars in the photo could be grouped or classified
stars there called stars
stars there called stars
High mass adult stars are classified as supergiants or giants, while low mass adult stars are classified as main sequence stars. This classification is based on the mass of the star and where it falls on the Hertzsprung-Russell diagram.
Stars are classified using the Hertzberg-Russell Diagram
a ball of light and gas.
Main Sequence
no they cant
They are classified by the amount of Light they give off, and their temperature.
The oldest stars are classified as population III stars [See related question]
The oldest stars are classified as population III stars [See related question]