Doppler imaging of young solar-type stars using the ANU 2.3 m Siding Spring Telescope

Masters Thesis


Burton, Donna Marie. 2013. Doppler imaging of young solar-type stars using the ANU 2.3 m Siding Spring Telescope. Masters Thesis Master of Science. University of Southern Queensland.
Title

Doppler imaging of young solar-type stars using the ANU 2.3 m Siding Spring Telescope

TypeMasters Thesis
Authors
AuthorBurton, Donna Marie
SupervisorCarter, Brad
Marsden, Stephen
De Silba, Gayandhi
Institution of OriginUniversity of Southern Queensland
Qualification NameMaster of Science
Number of Pages173
Year2013
Abstract

The study of surface activity on young solar-type stars provides an opportunity to improve understanding of stellar dynamos and indirectly gain insight into early solar evolution. Doppler Imaging (DI) can be used to map stellar surface activity, and utilises rotation-induced Doppler-broadening of spectral lines to calculate the surface distribution of a fundamental parameter such as temperature.
DI requires high-resolution spectroscopic observations distributed over one or more stellar rotation periods. To date only a limited number of single young solar analogues have been observed using this technique. Observations of many stars at various evolutionary states and with varying physical parameters are necessary to comprehensively constrain stellar dynamo models. These observations require long-term access to a telescope with a high-resolution echelle spectrograph to undertake multiple epoch studies of stellar activity.

This project has used the ANU 2.3 metre telescope to test Doppler imaging with two active young stars, AB Doradus (AB Dor) and HIP43720, with the HIP43720 observations contemporaneous with the Anglo-Australian Telescope (AAT) observations.

Analysis of the AB Dor mapping and comparison of the 2.3 metre and AAT results for HIP43720 indicates that the ANU 2.3 metre telescope with its high resolution echelle spectrograph is capable of undertaking scientifically useful Doppler Imaging for stellar dynamo surveys.

KeywordsDoppler imaging; stellar dynamo surveys; stellar surface activity; ANU 203 metre telescope
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Byline AffiliationsFaculty of Sciences
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