Starspots on the active young solar-type star AH Lep

Treschman, Keith (2010) Starspots on the active young solar-type star AH Lep. [Thesis (PhD/Research)]

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Young solar-type stars inform us about the early evolution of objects that form a major component of the stellar population of our galaxy.

Single active young solar-type stars close to the Sun’s mass also provide us with proxies for the Sun’s early history, its activity and underlying magnetic dynamo.

The active young solar-type star AH Lep provides a convenient target to image its magnetic activity in detail.

AH Lep is of particular interest because of its relatively modest rotation rate (v sin i = 28 km s-1) compared with other previously studied active stars; in other words, this star represents the opportunity to study the effects of rotation on the dynamo of young solar-type stars.

This thesis investigates the starspot features and magnetic field of AH Lep using the techniques of Doppler and Zeeman Doppler Imaging, resulting in a tomographic map of the star and magnetic field detections.

In contrast to the large polar spot features of more rapidly rotating active solar-type stars, mid-latitude starspots predominate on AH Lep. At the time of observation at least, AH Lep displayed little in the way of a polar spot and instead showed large spot features more reminiscent of the Sun today than the polar spot dominated appearance of rapid and ultrarapid rotators. Total spot coverage (3.3%) is not small but is significantly less than that of rapid rotators.

The magnetic field of AH Lep was detected in a number of observations and a tentative magnetic map was constructed. More observations under the most favourable conditions are needed to investigate more fully the magnetic topology of the star.

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Item Type: Thesis (PhD/Research)
Item Status: Live Archive
Additional Information: Master of Science thesis.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Supervisors: Carter, Brad
Date Deposited: 16 Sep 2011 05:51
Last Modified: 18 Jul 2016 02:55
Uncontrolled Keywords: star spots; starspots; star; AH lep
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems

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