Stars pulsate throughout their lifetime and these pulsations are the best way to investigate certain aspects of the star, such as the fundamental physics in the stellar interior. These pulsations are analysed through the movement of spectral lines with time. The changes in the line profile correlate directly to the variations in Doppler shifts on the stellar surface as the star expands and contracts. Stars pulsate either radially (where the star expands and contracts around its equilibrium by altering its radius to maintain its spherical shape) or non-radially (where some parts of the stars surface move inwards as other parts move outwards). These pulsations can be defined by different modes.

Gamma Doradus stars pulsate in a unique way. The restoring force of these stars is gravity and the origin of the pulsations mean they propagate very deep into the star and characterising these pulsations gives information about the internal stellar structure. It’s extremely important to categorise as many of these pulsating stars as possible to eventually develop a complete stellar model.

This poster will present the frequency and mode analysis of two Gamma Doradus variables, HD 139095 and HD 48501, and the line profile analysis of a third Gamma Doradus, HD 197541.