steltyper
steltyper is a term that refers to the different categories or types of stars based on their spectral characteristics. These classifications are primarily determined by the temperature of the star's surface, which in turn influences the elements that are ionized or excited in its atmosphere, and thus the spectral lines observed. The most common stellar classification system is the Morgan-Keenan (MK) system, which assigns letters from O, B, A, F, G, K, and M, in order of decreasing surface temperature. O-type stars are the hottest and bluest, while M-type stars are the coolest and reddest.
Each of these spectral types is further subdivided by a number from 0 to 9, with 0
Other, less common spectral types exist, such as L, T, and Y, which are used for very