Doppler imaging of active young stars

PhD Thesis

Brown, Carolyn J.. 2011. Doppler imaging of active young stars. PhD Thesis Doctor of Philosophy. University of Southern Queensland.
Title

Doppler imaging of active young stars

TypePhD Thesis
Authors
AuthorBrown, Carolyn J.
SupervisorCarter, Bradley
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages214
Year2011
Abstract

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.

KeywordsDoppler imaging; young stars; R58; LQ Lup; RX J0850.1-7554
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
519999. Other physical sciences not elsewhere classified
Byline AffiliationsDepartment of Biological and Physical Sciences
Permalink -

https://research.usq.edu.au/item/q0wvv/doppler-imaging-of-active-young-stars

Log in to edit

Download files

Published Version
Brown_2011_whole.pdf
File access level: Anyone

  • 2162
    total views
  • 430
    total downloads
  • 1
    views this month
  • 2
    downloads this month

Export as

Related outputs

Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop
Letchford, Roderick R., White, Graeme L. and Brown, Carolyn J.. 2022. "Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop." Astronomische Nachrichten. 343 (6-7), pp. 1-14. https://doi.org/10.1002/asna.20220018
Orbital Elements of visual binary stars with very short arcs: With application to double stars from the 1829 southern double star catalog of James Dunlop
Letchford, Roderick R., White, Graeme L. and Brown, Carolyn J.. 2022. "Orbital Elements of visual binary stars with very short arcs: With application to double stars from the 1829 southern double star catalog of James Dunlop." Astronomische Nachrichten. 343 (3), pp. 1-13. https://doi.org/10.1002/asna.20210113
Assessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop
Letchford, Roderick R., White, Graeme L. and Brown, Carolyn J.. 2022. "Assessment of the accuracy of measures in the 1829 southern double star catalogue of James Dunlop." Monthly Notices of the Royal Astronomical Society. 510 (4), pp. 5330-5347. https://doi.org/10.1093/mnras/stab3777
A planet within the debris disk around the pre-main-sequence star AU Microscopii
Plavchan, Peter, Barclay, Thomas, Gagne, Jonathan, Gao, Peter, Cale, Bryson, Matzko, William, Dragomir, Diana, Quinn, Sam, Feliz, Dax, Stassun, Keivan, Crossfield, Ian J.M., Berardo, David A., Latham, David W., Tieu, Ben, Anglada-Escude, Guillem, Ricker, George, Vanderspek, Roland, Seager, Sara, Winn, Joshua N., ..., Zilberman, Perri. 2020. "A planet within the debris disk around the pre-main-sequence star AU Microscopii." Nature. 582, pp. 497-500. https://doi.org/10.1038/s41586-020-2400-z
Publisher Correction: A planet within the debris disk around the pre-main-sequence star AU Microscopii
Plavchan, Peter, Barclay, Thomas, Gagne, Jonathan, Gao, Peter, Cale, Bryson, Matzko, William, Dragomir, Diana, Quinn, Sam, Feliz, Dax, Stassun, Keivan, Crossfield, Ian J.M., Berardo, David A., Latham, David W., Tieu, Ben, Anglada-Escude, Guillem, Ricker, George, Vanderspek, Roland, Seager, Sara, Winn, Joshua N., ..., Zilberman, Perri. 2020. "Publisher Correction: A planet within the debris disk around the pre-main-sequence star AU Microscopii." Nature. 583 (7818), p. E31. https://doi.org/10.1038/s41586-020-2516-1
TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association
Newton, Elisabeth R., Mann, Andrew W., Tofflemire, Benjamin M., Pearce, Logan, Rizzuto, Aaron C., Vanderburg, Andrew, Martinez, Raquel A., Wang, Jason J., Ruffio, Jean-Baptiste, Kraus, Adam L., Johnson, Marshall C., Thao, Pa Chia, Wood, Mackenna L., Rampalli, Rayna, Nielsen, Eric L., Collins, Karen A., Dragomir, Diana, Hellier, Coel, Anderson, D. R, ..., Wittenmyer, Robert A.. 2019. "TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association." The Astrophysical Journal Letters. 880 (1), pp. 1-15. https://doi.org/10.3847/2041-8213/ab2988
Shared skies partnership: a dual-site all-sky live remote observing initiative for research and education
Kielkopf, John F., Hart, Rhodes, Carter, Brad, Collins, Karen A., Brown, Carolyn, Hay, Jeff, Hons, Alex and Marsden, S. 2014. "Shared skies partnership: a dual-site all-sky live remote observing initiative for research and education." 223rd American Astronomical Society Meeting. Washington, United States 05 - 09 Jan 2014 Washington, DC. United States.
A Bcool spectropolarimetric survey of over 150 solar-type stars
Marsden, Stephen, Petit, Pascal, Jeffers, Sandra, do Nascimento, Jose-Dias, Carter, Bradley, Brown, Carolyn, Marsden S., Petit P., Jeffers S., Do Nascimento J.D., Carter B. and Brown C.. 2014. "A Bcool spectropolarimetric survey of over 150 solar-type stars." Proceedings of the International Astronomical Union. 9 (S302), pp. 138-141. https://doi.org/10.1017/S1743921314001896
Starspots on young solar-type stars
Brown, Carolyn, Carter, Brad, Marsden, Stephen, Waite, Ian, Brown C., Carter B., Marsden S. and Waite I.. 2014. "Starspots on young solar-type stars." Proceedings of the International Astronomical Union. 9 (S302), pp. 148-149. https://doi.org/10.1017/S1743921314001938
Magnetic fields and differential rotation on the pre-main sequence -I. The early-G star HD 141943 - brightness and magnetic topologies
Marsden, S. C., Jardine, M. M., Ramirez Velez, J. C., Alecian, E., Brown, C. J., Carter, B. D., Donati, J.-F., Dunstone, N., Hart, R., Semel, M. and Waite, I. A.. 2011. "Magnetic fields and differential rotation on the pre-main sequence -I. The early-G star HD 141943 - brightness and magnetic topologies." Monthly Notices of the Royal Astronomical Society. 413 (3), pp. 1922-1938. https://doi.org/10.1111/j.1365-2966.2011.18367.x
Magnetic fields and differential rotation on the pre-main sequence - II. The early-G star HD 141943 - coronal magnetic field, Hα emission and differential rotation
Marsden, S. C., Jardine, M. M., Ramirez Velez, J. C., Alecian, E., Brown, C. J., Carter, B. D., Donati, J.-F., Dunstone, N., Hart, R., Semel, M. and Waite, I. A.. 2011. "Magnetic fields and differential rotation on the pre-main sequence - II. The early-G star HD 141943 - coronal magnetic field, Hα emission and differential rotation." Monthly Notices of the Royal Astronomical Society. 413 (3), pp. 1939-1948. https://doi.org/10.1111/j.1365-2966.2011.18272.x
High-resolution spectroscopy and spectropolarimetry of some late F-/early G-type sun-like stars as targets for zeeman doppler imaging
Waite, I. A., Marsden, S. C., Carter, B. D., Alecian, E., Brown, C., Burton, D., Hart, R., Waite I.A., Marsden S.C., Carter B.D., Aĺcian E., Brown C., Burton D. and Hart R.. 2011. "High-resolution spectroscopy and spectropolarimetry of some late F-/early G-type sun-like stars as targets for zeeman doppler imaging." Publications of the Astronomical Society of Australia. 28 (4), pp. 323-337. https://doi.org/10.1071/AS11025
Remote laboratories and experiment kits for tertiary Physics distance education students: where is USQ now?
Turner, Joanna, Parisi, Alfio V., Carter, Brad and Brown, Carolyn. 2010. "Remote laboratories and experiment kits for tertiary Physics distance education students: where is USQ now?" Barberio, E. and Hannaford, P. (ed.) AIP 2010: 19th Australian Institute of Physics Congress. Melbourne, Australia 05 - 09 Dec 2010 Melbourne, Australia.