Stellar population models and chemical enrichment in early-type galaxies

Lead Research Organisation: University of Central Lancashire


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Knowles A (2019) Stellar spectral models compared with empirical data in Monthly Notices of the Royal Astronomical Society

Title SS4.07 Building a New Semi-Empirical Stellar Library with Variable Abundance Patterns - Poster at EWASS 2018 
Description Poster at EWASS 2018 - outlined work achieved and future plans for PhD 
Type Of Art Artwork 
Year Produced 2018 
Impact Presented work I did in the early stages of the PhD, including testing of some of the latest theoretical stellar models. Outlined the future plans of using the models to produce a new publicly available library of semi-empirical stellar spectra 
Title Library of Theoretical Stellar Spectra 
Description These data are for three theoretical grids of stellar spectra, generated by A.T. Knowles in work for his thesis (Knowles, in prep.). The spectra are produced using ATLAS9 code to create 1-d, LTE model atmospheres. These atmospheres are used, together with opacity distribution functions (from and the 1-d mode ASSET radiative transfer code (Koesterke 2009), to create the resultant star spectra. The details of computation are presented in A.T. Knowles' thesis and are similar to those described in Allende Prieto et al., (2018). See also Knowles et al., (2019). The star spectra cover a UV to optical wavelength range from 1677 to 9001 Angstroms and a wide range of effective temperatures, surface gravities and element abundances. 
Type Of Material Computer model/algorithm 
Year Produced 2019 
Provided To Others? Yes  
Impact Used the database in the thesis of A .T. Knowles. Publicly available database for the community to use. Eventually will be part of a publication in MNRAS. 
Title Response Functions 
Description Results of spectral modelling of stars: Tables showing how much spectral line strengths change (in Ångstroms or magnitudes) when particular elements are increased by a factor of two in abundance in the spectra of different star types. The line strengths are those defined by the Lick standard wavelength ranges (e.g. see ). The spectral models are from three different approaches (labelled as Conroy, Coelho and CAP). Details will be published by Adam T. Knowles (PhD thesis in preparation). 
Type Of Material Database/Collection of data 
Year Produced 2019 
Provided To Others? Yes  
Impact Up-to-date response functions from three of the most commonly used models in the literature. Will be part of a publication in MNRAS - MN-18-1914-MJ.R3 accepted 1st March 2019