Doppler imaging of active young stars

Brown, Carolyn J. (2011) Doppler imaging of active young stars. [Thesis (PhD/Research)]

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This thesis investigates the activity of three young solar analogues, R58, LQ Lup, and RX J0850.1-7554, using Doppler imaging, as a way to investigate the early history of solar activity by proxy. The spot distributions of the targeted stars have been mapped and differential rotation measurements obtained from the drift of spot features over the course of the observations. A large polar spot is present on all targets examined within this thesis, as well as the simultaneous presence of mid and low latitude features. Comparison of differential rotation results for R58 and LQ Lup to previous work suggests these stars can undergo changes in differential rotation over time. Furthermore, a differential rotation measurement for RX J0850.1-7554 suggests this star is the first known example of a G-type star with solid body rotation. Overall, the results presented suggest the young Sun was a star with a major polar spot feature and some smaller spots at lower latitudes, and most likely possessed a fundamentally different dynamo to today.s Sun.

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Item Type: Thesis (PhD/Research)
Item Status: Live Archive
Additional Information: Doctor of Philosophy (PhD) thesis.
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Supervisors: Carter, Bradley
Date Deposited: 10 Aug 2011 23:51
Last Modified: 27 Jul 2016 01:42
Uncontrolled Keywords: Doppler imaging; young stars; R58; LQ Lup; RX J0850.1-7554
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics

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