Stellar population models and chemical enrichment in early-type galaxies
Lead Research Organisation:
University of Central Lancashire
Department Name: Jeremiah Horrocks Institute
Abstract
Populations of stars in galaxies retain clues to the history of how galaxies evolved, over billions of years. This project will study populations of stars in ellipticals, lenticular and spiral bulges in the local Universe. The aim is to develop new techniques to measure the chemical evolution patterns in those galaxies and so gain information about the sources of enrichment from different types of exploding stars and the duration times of star formation that implies. Stellar spectra form the MILES library together with theoretical model spectra of stars will be used to investigate different parts of UV/optical wavebands for extracting information on stellar population ages and chemical abundance patterns.
People |
ORCID iD |
| Anne Sansom (Primary Supervisor) | |
| Adam Knowles (Student) |
Studentship Projects
| Project Reference | Relationship | Related To | Start | End | Student Name |
|---|---|---|---|---|---|
| ST/N504014/1 | 01/10/2015 | 31/03/2021 | |||
| 1661673 | Studentship | ST/N504014/1 | 01/10/2015 | 31/03/2019 | Adam Knowles |
| 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 |
| URL | https://az659834.vo.msecnd.net/eventsairwesteuprod/production-kuonicongress-public/840afc40ee694e4fa... |
| 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 http://www.iac.es/proyecto/ATLAS-APOGEE/) 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. |
| URL | https://uclandata.uclan.ac.uk/178/ |
| 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 http://astro.wsu.edu/worthey/html/index.table.html ). 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 |
| URL | http://uclandata.uclan.ac.uk/175/ |