Starspots on the active young solar-type star AH Lep

Masters Thesis


Treschman, Keith. 2010. Starspots on the active young solar-type star AH Lep. Masters Thesis Master of Science. University of Southern Queensland.
Title

Starspots on the active young solar-type star AH Lep

TypeMasters Thesis
Authors
AuthorTreschman, Keith
SupervisorCarter, Brad
Institution of OriginUniversity of Southern Queensland
Qualification NameMaster of Science
Number of Pages82
Year2010
Abstract

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.

Keywordsstar spots; starspots; star; AH lep
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Byline AffiliationsDepartment of Biological and Physical Sciences
Permalink -

https://research.usq.edu.au/item/q0x90/starspots-on-the-active-young-solar-type-star-ah-lep

Download files


Published Version
Treschman_2010_whole.pdf
File access level: Anyone

  • 2041
    total views
  • 622
    total downloads
  • 0
    views this month
  • 0
    downloads this month

Export as

Related outputs

Astronomical tests of general relativity
Treschman, Keith John. 2015. Astronomical tests of general relativity. PhD Thesis Doctor of Philosophy. University of Southern Queensland.
Recent astronomical tests of general relativity
Treschman, Keith John. 2015. "Recent astronomical tests of general relativity." International Journal of Physical Sciences. 10 (2), pp. 90-105. https://doi.org/10.5897/IJPS2014.4236
General relativity support from the double pulsar
Treschman, Keith John. 2015. "General relativity support from the double pulsar." International Journal of Physical Sciences. 10 (15), pp. 456-465. https://doi.org/10.5897/IJPS2015.4382
Early astronomical tests of general relativity: the anomalous advance in the perihelion of Mercury and gravitational redshift
Treschman, Keith John. 2014. "Early astronomical tests of general relativity: the anomalous advance in the perihelion of Mercury and gravitational redshift." Asian Journal of Physics. 23 (1 & 2), pp. 171-188.
Early astronomical tests of general relativity: the gravitational deflection of light
Treschman, Keith John. 2014. "Early astronomical tests of general relativity: the gravitational deflection of light." Asian Journal of Physics. 23 (1 & 2), pp. 145-170.