Spectroscopic analysis of the Gamma Doradus variable HD 135825 with iSpec and ASPiS

Determination of the atmospheric parameters and chemical abundances of gamma-Dor stars is of significant importance to the ongoing efforts to study their compositions, origins and interior workings. Spectroscopic analysis of the gamma-Doradus variable star HD 135825 and three spectroscopic standard stars HD 22879, HD 49933 and HD 61421 was carried out using synthetic spectral fitting methods. A suite of automation scripts, referred to as ASPiS, was created to allow streamlined analysis via use of the iSpec software package. The parameter and abundance results for the standard stars showed good agreement with literature values and confirm the validity of the ASPiS methodology. Analysis of HD 135825 revealed abundance and parameter values in line with expectation but with large fractional uncertainties, indicating further revision is needed for use of this method with gamma-Dor stars. A possible link between the pulsation phase of an observation and the fitting of the surface gravity and projected equatorial velocity parameters was established from the analysis of HD 135825. This may potentially impact studies attempting to apply a single uniform parameter fit to large observational datasets taken over extended periods of time. Instead, it may be advantageous to perform analyses on smaller sets of data taken within a smaller timeframe where pulsational effects will be minimised.