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ThereYulduzlar arespektrlariga differentkoʻra single-letterbir classificationsharf ofbilan starsbelgilanadigan accordingturli tosinflarga their spectraajratiladi, ranging from type ''O'', whicheng issiq areyulduz verysinfi hotboʻlsa, to ''M'', whichsinfidagi areyulduz soshunday cool that moleculessovuq-ki, mayuning formatmosferasida inmolekulalar theirshakllanishi atmospheresmumkin. TheSirt mainharorati classificationskamayishi inboʻyicha ordersinflar of decreasing surface temperature arequyidagicha: ''O, B, A, F, G, K'', andva ''M''. AKamyob varietyspektr oftiplar rareuchun spectralmaxsus typessinflar have special classificationsmavjud. The most common ofUlardan theseeng arekeng typestarqalganlari ''L'' andva ''T'' boʻlib, whichbu classifysinflarga theeng coldestsovuq low-masskichik massali yulduzlar starsva andjigarrang brownmittilar dwarfskiradi. EachHar letterbir hasharf 10harorat sub-divisions,kamayishi numbered fromboʻylab 0 todan 9, ingacha order10 ofta decreasingostqismga temperatureega. However,Biroq thisushbu systemtizim breaksekstremal downyuqori atharoratlarda extreme high temperaturesbuziladi: class ''O0'' andva ''O1'' stars mayyulduzlar notboʻlmasligi existmumkin.<ref name="spectrum">{{cite web
| first=Alan M | last=MacRobert
| url =http://www.skyandtelescope.com/howto/basics/3305876.html
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