M Class stars have the following characteristics.
Correct. M-type stars on the main sequence are called red dwarfs.
yes they are, in fact, white stars a hotter than blue or red star, and blue stars are varie in sizes, red stars are usually mid size or red giants or super giants. the bigger they are does not mean they are hotter!
This is more complicated than it might seem. The short answer is "M, T, or Y, depending." The coolest type in the Harvard classification system is M; red or (in late M) brown dwarfs. Class M stars have temperatures below around 3700 K. In order to further distinguish between stars at the very low end of the temperature scale, a few new classes have been proposed. In this new classification scheme, stars between 1300-2000 K are assigned type L; stars below 1300 K are assigned type T. The main reason for choosing this particular temperature is that around 1300 K the spectrum of the star changes and they begin to show evidence of methane in their atmospheres, so type T stars are also called "methane dwarfs". Finally, a hypothetical type Y has been proposed for "ammonia dwarfs", stars which show ammonia absorption lines in their spectra. There is some dispute whether or not any type Y stars have actually been found or not. Type Y stars are expected to be cooler than 600 K or so.
Blue (O).
M stars
class q (third answer)
Red stars (Red dwarfs and red giants) have a spectral class of M.
Red stars (Red dwarfs and red giants) have a spectral class of M.
It all depends on the mass of the star 1exp10*(m/l) where "m" is mass and "l" is luminosity. Will give you an approximate period of the stars life.
M stars contan metal oxides molecules.
their surfaces are so cool that most hydrogen is in the ground state.
Bright stars are rare, dim stars are common, so class M are the most common that we can see, but even dimmer ones are postulated to be even more common.
Almost all stars end their lives as Red stars. There are a few exceptions to the rules. Such as stars from the spectral class of B4-O5 will never be stable enough to reach a red supergiant phase and these stars go supernova while their still close to the spectral type they began life as. A great example of one of these stars is the Hyper giant Rho Cas, which is near the end of its short life and will blow up as a F9-G3 star never reaching the orange K class or the Red M class.
Correct. M-type stars on the main sequence are called red dwarfs.
yes they are, in fact, white stars a hotter than blue or red star, and blue stars are varie in sizes, red stars are usually mid size or red giants or super giants. the bigger they are does not mean they are hotter!
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.
M Class