Classification of stars using optical spectra

Abstract

This report presents a study on the classification of stars using optieal spectra. Data from theSloan Digital Sky Survey(SDSS) Spectroscopic Arehive Server (SAS) was utilized,and threeoptical spectra were extracted from a sample of seven stars. These spectra cover a range ofspectral types (O,B,A,F,G,K,and M)and include meastrenents of flux and wavelength.By analyzing the emission and absorption lines in the spectra and comparing them with stan-dard spectra,the stars wore classified into their respective spectral types,and their chenicalcomposition was determined.The results demonstrate a high degree of consistency in the spectral features and chemicalcomposition across the data sets, validating the reliability of the methodology employed. Theanalysis ilentified stars from various spectral classecs,including B-type main-sequence stars,G-type and K-type giant stars,and M-type giant stars. The most common elements detected inthe stellar spectra were hydrogen (H),helium (He),calcium(Ca),magnesium(Mg),and sodium(Na),with hydrogen being the most prevalent. These findings align with established stellar classification systems and provide insights into the chemical makeup of stars.