Aspects of TIRSPEC near-infrared spectral library

Spectral libraries serve as reference for the classification of observed spectra, and also help to generate telluric templets for the observing instrument which are applicable on the spectra of the science targets. We are building a unified TIFR Near Infrared Spectrometer and Imager (TIRSPEC) spectral library, which not only contains sources for different spectral types and luminosity classes, but also covers a range of ages (e.g. pre-main sequence Herbig stars to post-main sequence Wolf-Rayet stars). We have selected near-infrared (NIR) bands, mainly because NIR spectra can serve as unique reference while studying cool stars, stars in young embedded clusters, and stars towards highly obscured region of the Galaxy. Also, increasing number of NIR spectra for different spectral type helps to refine the stellar atmosphere/evolution models. Further, we plan to generate templets of telluric absorption spectrum using "Diffusion map" of the observed standard stars' spectra, which can be used to model the telluric absorption lines of the science spectrum. In the first part of my talk, the details on the spectral library will be discussed.
Recently, Galactic bubbles (shell like structures seen in Spitzer 5.8 micron images) are getting importance because of their multifarious morphology, developed by different energetic sources. Bubbles associated with massive star(s) are the most suitable sights for multi-wavelength study, which will help us to understand the effects of massive star(s) on the evolution of surrounding material. I will also discuss about a few important results of my on-going research work on Galactic bubble associated with massive OB and W-R stars.