The active young solar-type star HR 1817 (=HD 35850)

Masters Thesis


Mengel, Matthew Wayne. 2005. The active young solar-type star HR 1817 (=HD 35850). Masters Thesis Master of Philosophy. University of Southern Queensland.
Title

The active young solar-type star HR 1817 (=HD 35850)

TypeMasters Thesis
Authors
AuthorMengel, Matthew Wayne
SupervisorCarter, Brad
Institution of OriginUniversity of Southern Queensland
Qualification NameMaster of Philosophy
Number of Pages103
Year2005
Abstract

The active F dwarf HR 1817 represents the upper temperature extreme of what are broadly termed solar-type stars - stars which have the same internal structure as the Sun, albeit in this case with a much smaller convective zone. To date, studies of the active surface features and magnetic fields of solar-type stars have been restricted to G and K dwarfs. This thesis investigates the surface and magnetic features of HR 1817 using the techniques of Doppler and Zeeman Doppler Imaging, resulting in tomographic maps of the stellar surface and magnetic field. Cooler stars than HR 1817 exhibit large polar spots, and while HR 1817 also exhibits a polar spot, it is not nearly as large as those usually seen. The lower-latitude surface features of HR 1817 are weak but well defined and cover a relatively small area of the stellar surface. Total spot coverage is relatively small (~ 1.7 - 2 per cent). Zeeman Doppler Imaging reveals that HR 1817 exhibits a richly-detailed, though weak magnetic topography. A ring of azimuthal field appears around the pole, while the radial field exhibits many well-defined and distinct bipolar mid-latitude magnetic features, perhaps indicating a more dominant interface dynamo as opposed to the posited distributed dynamo of cooler active dwarfs. Finally, a differential rotation measurement of the star indicates an extremely large rotational shear. Values for the equatorial rotation and rotational shear of 6.494 +/- 0.010 rad/d and 0.256 +/- 0.017 rad/d respectively are found. This equatorial rotation is equivalent to a rotational period for HR 1817 of ~ 0.98 days. The very high rotational shear of 0.256 rad/d is fast enough for the equator to lap the pole in approximately 23 days.

Keywordssolar-type star, doppler, sun, solar, HR 1817
ANZSRC Field of Research 2020519999. Other physical sciences not elsewhere classified
Byline AffiliationsFaculty of Sciences
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Huber, Jeremy M., Kielkopf, John F., Mengel, Matthew, Carter, Bradley D., Ferland, Gary J. and Clark, Frank O.. 2018. "A young solar twin in the Rosette cluster NGC 2244 line of sight." Monthly Notices of the Royal Astronomical Society. 476 (1), pp. 323-335. https://doi.org/10.1093/mnras/sty188
A BCool survey of the magnetic fields of planet-hosting solar-type stars
Mengel, M. W., Marsden, S. C., Carter, B. D., Horner, J., King, R., Fares, R., Jeffers, S. V., Petit, P., Vidotto, A. A. and Morin, J.. 2017. "A BCool survey of the magnetic fields of planet-hosting solar-type stars." Monthly Notices of the Royal Astronomical Society. 465 (3), pp. 2734-2747. https://doi.org/10.1093/mnras/stw2949
The Anglo-Australian planet search. XXV. A candidate massive Saturn analog orbiting HD 30177
Wittenmyer, Robert A., Horner, Jonathan, Mengel, M. W., Butler, R. P., Wright, D. J., Tinney, C. G., Carter, B. D., Jones, H. R. A., Anglada-Escude, G., Bailey, J. and O'Toole, Simon J.. 2017. "The Anglo-Australian planet search. XXV. A candidate massive Saturn analog orbiting HD 30177." The Astronomical Journal. 153 (4), pp. 1-12. https://doi.org/10.3847/1538-3881/aa5f17
Temporal variability of the wind from the star τ Boötis
Nicholson, B. A., Vidotto, A. A., Mengel, M., Brookshaw, L., Carter, B., Petit, P., Marsden, S. C., Jeffers, S. V. and Fares, R.. 2016. "Temporal variability of the wind from the star τ Boötis." Monthly Notices of the Royal Astronomical Society. 459 (2), pp. 1907-1915. https://doi.org/10.1093/mnras/stw731
The Pan-Pacific planet search. IV. Two super-Jupiters in a 3:5 resonance orbiting the giant star HD 33844
Wittenmyer, Robert A., Johnson, John Asher, Butler, R. P., Horner, Jonathan, Wang, Liang, Robertson, Paul, Jones, M. I., Jenkins, J. S., Brahm, R., Tinney, C. G., Mengel, M. W. and Clark, J.. 2016. "The Pan-Pacific planet search. IV. Two super-Jupiters in a 3:5 resonance orbiting the giant star HD 33844." The Astrophysical Journal: an international review of astronomy and astronomical physics. 818 (1), pp. 35-42. https://doi.org/10.3847/0004-637X/818/1/35
Winds of planet hosting stars
Nicholson, B. A., Mengel, M. W., Brookshaw, L., Vidotto, A. A., Carter, B. D., Marsden, S. C., Soutter, J., Waite, I. A. and Horner, J.. 2015. "Winds of planet hosting stars." Short, Wayne and Cairns, Iver (ed.) 14th Australian Space Research Conference (ASRC 2014). Adelaide, Australia 29 Sep - 01 Oct 2014 Sydney, Australia.
The evolving magnetic topology of τ Boötis
Mengel, M. W., Fares, R., Marsden, S. C., Carter, B. D., Jeffers, S. V., Petit, P., Donati, J.-F. and Folsom, C. P.. 2016. "The evolving magnetic topology of τ Boötis." Monthly Notices of the Royal Astronomical Society. 459 (4), pp. 4325-4342. https://doi.org/10.1093/mnras/stw828
Do young Suns undergo magnetic reversals?
Marsden, Stephen C., Jeffers, Sandra V., Donati, Jean-Francois, Mengel, Matthew W., Waite, Ian A. and Carter, Brad D.. 2010. "Do young Suns undergo magnetic reversals?" Kosovichev, Alexander, Rozelot, Jean-Pierre and Andrei, Alexandre (ed.) International Astronomical Union Symposium (IAUS 264): Solar and Stellar Variability: Impact on Earth and Planets. Rio de Janeiro, Brazil 03 - 07 Aug 2009 Cambridge, United Kingdom. https://doi.org/10.1017/S1743921309992535
A multiwavelength study of CC Eridani
Slee, O. B., Budding, E., Carter, Brad D., Mengel, Matthew Wayne, Waite, Ian A. and Donati, J.-F.. 2004. "A multiwavelength study of CC Eridani." Publications of the Astronomical Society of Australia. 21 (1), pp. 72-81. https://doi.org/10.1071/AS03034
Dynamo processes and activity cycles of the active stars AB Doradus, LQ Hydrae and HR 1099
Donati, J.-F., Collier Cameron, A., Semel, M., Hussain, G. A. J., Petit, P., Carter, B. D., Marsden, S. C., Mengel, M., Lopez Ariste, A., Jeffers, S. V. and Rees, D. E.. 2003. "Dynamo processes and activity cycles of the active stars AB Doradus, LQ Hydrae and HR 1099." Monthly Notices of the Royal Astronomical Society. 345 (4), pp. 1145-1186. https://doi.org/10.1046/j.1365-2966.2003.07031.x
The magnetic activity of young suns: magnetic topologies and differential rotation of F- and G- dwarfs
Marsden, S. C., Mengel, M. W., Donati, J.-F., Carter, B. D., Semel, M. and Petit, P.. 2006. "The magnetic activity of young suns: magnetic topologies and differential rotation of F- and G- dwarfs." Casini, R. and Lites, B. W. (ed.) 4th Solar Polarization Workshop. Boulder, United States 19 - 23 Sep 2005 San Francisco, United States.
High-resolution spectroscopy of some active southern stars
Waite, I. A., Carter, B. D., Marsden, S. C. and Mengel, M. W.. 2005. "High-resolution spectroscopy of some active southern stars." Publications of the Astronomical Society of Australia. 22 (1), pp. 29-35. https://doi.org/10.1071/AS04058
A radio and optical study of the active young F star HR 1817 (=HD 35850)
Budding, E., Carter, B. D., Mengel, M. W., Slee, O. B. and Donati, J. -F.. 2002. "A radio and optical study of the active young F star HR 1817 (=HD 35850)." Publications of the Astronomical Society of Australia. 19 (4), pp. 527-533. https://doi.org/10.1071/AS02021
Surface differential rotation and prominences of the Lupus post T Tauri star RX J1508.6-4423
Donati, J.-F., Mengel, M., Carter, B. D., Marsden, S., Collier Cameron, A. and Wichmann, R.. 2000. "Surface differential rotation and prominences of the Lupus post T Tauri star RX J1508.6-4423." Monthly Notices of the Royal Astronomical Society. 316 (3), pp. 699-715. https://doi.org/10.1046/j.1365-8711.2000.03570.x