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The magnetic and spin-down properties of slowly rotating fully convective M dwarfs
Victor See, Louis Amard, Stefano Bellotti +19
The evolution of the magnetism, winds and rotation of low-mass stars are all linked. One of the most common ways to probe the magnetic properties of low-mass stars is with the Zeem…
Do non-dipolar magnetic fields contribute to spin-down torques?
Victor See, Sean P. Matt, Adam J. Finley +14
Main sequence low-mass stars are known to spin-down as a consequence of their magnetised stellar winds. However, estimating the precise rate of this spin-down is an open problem. T…
Estimating magnetic filling factors from Zeeman-Doppler magnetograms
Victor See, Sean P. Matt, Colin P. Folsom +15
Low-mass stars are known to have magnetic fields that are believed to be of dynamo origin. Two complementary techniques are principally used to characterise them. Zeeman-Doppler im…
Studying stellar spin-down with Zeeman-Doppler magnetograms
V. See, M. Jardine, A. A. Vidotto +11
Magnetic activity and rotation are known to be intimately linked for low-mass stars. Understanding rotation evolution over the stellar lifetime is therefore an important goal withi…
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333)
Ian Waite, Stephen Marsden, Brad Carter +6
The magnetic fields, activity and dynamos of young solar-type stars can be empirically studied using time-series of spectropolarimetric observations and tomographic imaging techniq…
The connection between stellar activity cycles and magnetic field topology
V. See, M. Jardine, A. A. Vidotto +14
Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages. When observed over multiple…
The energy budget of stellar magnetic fields
V. See, M. Jardine, A. A. Vidotto +15
Spectropolarimetric observations have been used to map stellar magnetic fields, many of which display strong bands of azimuthal fields that are toroidal. A number of explanations h…
Magnetic fields on young, moderately rotating Sun-like stars - I: HD~35296 and HD~29615
Ian Waite, Stephen Marsden, Bradley Carter +4
Observations of the magnetic fields of young solar-type stars provide a way to investigate the signatures of their magnetic activity and dynamos. Spectropolarimetry enables the stu…
Doppler images and the underlying dynamo. The case of AF Leporis
S. P. Järvinen, R. Arlt, T. Hackman +6
The (Zeeman-)Doppler imaging studies of solar-type stars very often reveal large high-latitude spots. This also includes F stars that possess relatively shallow convection zones, i…
Stellar magnetism: empirical trends with age and rotation
A. A. Vidotto, S. G. Gregory, M. Jardine +12
We investigate how the observed large-scale surface magnetic fields of low-mass stars (~0.1 -- 2 Msun), reconstructed through Zeeman-Doppler imaging (ZDI), vary with age t, rotatio…
Starspots on Young Solar-Type Stars
Carolyn Brown, Brad Carter, Stephen Marsden +1
Doppler Imaging of starspots on young solar analogues is a way to investigate the early history of solar magnetic activity by proxy. Doppler images of young G-dwarfs have yielded t…
A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - I. Observations and measurements
E. Alecian, G. A. Wade, C. Catala +7
This is the first in a series of papers in which we describe and report the analysis of a large survey of Herbig Ae/Be stars in circular spectropolarimetry. Using the ESPaDOnS and…
Discovery of a magnetic field in the early B-type star sigma Lupi
H. F. Henrichs, K. Kolenberg, B. Plaggenborg +7
Magnetic early B-type stars are rare. To identify them, we use the strongest indirect indicator of a magnetic field in B stars, which is periodic variability of UV stellar wind lin…
Chemical abundances of magnetic and non-magnetic Herbig Ae/Be stars
C. P. Folsom, S. Bagnulo, G. A. Wade +4
The photospheres of about 10-20% of main sequence A- and B-type stars exhibit a wide range of chemical peculiarities, often associated with the presence of a magnetic field. It is…
High Resolution Spectroscopy and Spectropolarimetry of some late F-/early G-type sun-like stars as targets for Zeeman Doppler imaging
Ian Waite, Stephen Marsden, Brad Carter +4
High resolution spectroscopy and spectropolarimetry have been undertaken at the Anglo-Australian Telescope in order to identify suitable targets for magnetic studies of young sun-l…
Discovery of the magnetic field of the B1/B2V star σLupi
H. F. Henrichs, K. Kolenberg, B. Plaggenborg +7
In our search for new magnetic massive stars we use the strongest indirect indicator of a magnetic field in B stars, which is periodic variability of UV stellar wind lines occurrin…
Magnetic fields and differential rotation on the pre-main sequence III: The early-G star HD 106506
I. A. Waite, S. C. Marsden, B. D. Carter +5
We present photometry and spectropolarimetry of the pre-main sequence star HD 106506. A photometric rotational period of ~1.416 +/- 0.133 days has been derived using observations a…
Magnetic fields and differential rotation on the pre-main sequence II: The early-G star HD 141943 - coronal magnetic field, H-alpha emission and differential rotation
S. C. Marsden, M. M. Jardine, J. C. Ramírez Vélez +8
Spectropolarimetric observations of the pre-main sequence early-G star HD 141943 were obtained at three observing epochs (2007, 2009 and 2010). The observations were obtained using…
Magnetic fields and differential rotation on the pre-main sequence I: The early-G star HD 141943 - brightness and magnetic topologies
S. C. Marsden, M. M. Jardine, J. C. Ramírez Vélez +8
Spectroscopic and spectropolarimetric observations of the pre-main sequence early-G star HD 141943 were obtained at four observing epochs (in 2006, 2007, 2009 and 2010). The observ…
Discovery of the magnetic field in the B1/B2V star sigma Lupi
H. F. Henrichs, K. Kolenberg, B. Plaggenborg +4
The ultraviolet stellar wind lines of the photometrically periodic variable early B-type star sigma Lupi were found to behave very similarly to what has been observed in known magn…