Infrared Spectroscopic Study Of Wolf Rayet Stars

Wolf-Rayet stars, whose spectrum shows large numbers of strong, broad emissionlines, have high temperature, luminosity, and mass loss rate and strong stellar wind,which make it different from other normal stars.It is considered as the ideal object forthe study of the youngest stellar population research. This paper consists of three parts:The first part contains the research background, physical properties, formation andevolution and observation of Wolf-Rayet stars.The part two briefly introduces the main equipment of the Spitzer space telescopeand infrared spectrum database CASSIS(Cornell Atlas of Spitzer IRS Sources). TheSpitzer space telescope represents the most advanced technology for infraredobservation. It has high sensitivity. CASSIS contains about13000spectra of11000sources from the Spitzer space telescope’s low-resolution module, and all the data aredownloaded for all users.The third part focuses on the study of stars’ infrared spectra Wolf-Rayet. The sample arestudied includes twenty-three WN stars, eleven WC stars and three WO stars. And theconclusion is briefly summarized as follows. First, the infrared continuous spectrum canbe fitted by the power-law function. Second, the main spectral line of the infraredspectrum are from Helium. Third, the silicate absorption from8to12m is caused bythe Galaxy’s interstellar medium. Fourth, a new way to classify Wolf-Rayet stars by theinfrared spectra is proposed by the author in the last part.