- #1
ehabmozart
- 213
- 0
This topic is quite confusing.. In the first place, how can we classify for example all O class stars would be having the same spectrum with the same absorbtion lines... Secondly, i just need a clarification on what do these absorbtion line reprsent and upon that how can we decide whether a star is in it main sequence or not.. Whoever dominates, i am thankful to him!