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We present high quality long slit spectra along the major and minor axes outto 1.5 effective radius ($R_e$) of the massive galaxy NGC4636 taken byHobby-Eberly Telescope (HET). Using Fourier Correlation Quotient (FCQ) method,we measured the stellar line-of-sight velocity distribution along the axes.Furthermore, six Lick/IDS indices($H\beta,Mgb,Fe_{5015},Fe_{5270},Fe_{5335},Fe_{5406}$) are derived from theclean spectrum. By comparing the measured absorption line strengths with thepredictions of Simple Stellar Populations (SSP) models, we derived ages, totalmetallicity and $\alpha$ abundance profiles of the galaxy. This galaxy presentsold and $[\alpha/Fe]$ over abundant stellar populations. Indeed, using the SSPmodel, we obtained the broadband color profiles. The theoretical colors matchwell with the measured colors and present red sharp peaks at the galaxy center.The sharp peaks of the colors are mainly shaped by the high metallicity in thegalaxy center. Interestingly, the galaxy has steep negative metallicitygradients, but trend flattens outwards. This result likly suggests that thecenter and outer regions of the galaxy formed through different formationprocess.

Stellar kinematics and populations out to 1.5 effective radius in the elliptical galaxy NGC4636