Abstract
Most of the commonly used tracers of age of starburst regions are based on the presence of massive O-type and Wolf Rayet stars, and hence are applicable only during the nebular and WR phases of starburst. The beginning of the WR phase coincides with the end of the RSG phase. The presence of RSGs in starburst regions can be directly inferred by the Calcium Triplet (CaT) and other characteristic absorption features. These features, accompanied by evolutionary population synthesis modeling, can be used for accurate age determinations of starburst regions. Spatially resolved CaT spectra of a sample of nearby starburst galaxies are being analyzed to determine the age of starbursts in them. Results for the starburst knots of M 82 are presented here.
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