In order to learn the nature of the celestial sources in-depth,spectroscopy is considered as the major tool for astronomers. This immediately demands to equip the astronomical telescope with the accurate and efficient spectroscopic instrumentation. Moreover higher the spectral resolution of the instrument, the more detailed information about the observed source becomes available to the astronomer. A High-Resolution Spectrograph is envisaged as a key instrument to meet the spectroscopic requirements of the telescope. The design of the spectrograph will be based on the concept of white pupil beam folding for high-resolution spectrograph. The instrument is planned to be a side port instrument with an optical fiber carrying the light from the telescope focal plane to the spectrograph room. The scientific requirements are framed to meet the interests of the Indian astronomers. The technical specifications have been generated based on the following the science drivers.

–> Asteroseismology                                                                                        

–> Abundances Studies                            

–> Doppler imaging of spotted stars

–> Peculiar eruptive young stellar objects and Winds from T-Tauri stars

–> Spectroscopy and Ground-based Follow-up of Exoplanets

–> Supernovae

Proposed instruments will be designed for use with the 3.6-m Devasthal Optical Telescope of ARIES with the average seeing of 1 arc seconds at V band. It will consist of the Main spectrograph unit, Interface unit with the telescope, Exposure meter, guiding unit, calibration unit, and Atmospheric dispersion corrector. The instrument will cover the entire optical band from 380 to 900 nm. It will have two resolutions mode: the high-resolution mode (80k) and the low-resolution mode (20/40k).