Observations of non-solar-type dynamo processes in stars with shallow convective zones

Jeffers, S.V., Donati, J-F., Alecian, E., and Marsden, S.C. (2011) Observations of non-solar-type dynamo processes in stars with shallow convective zones. Monthly Notices of the Royal Astronomical Society, 411 (2). pp. 1301-1312.

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Abstract

The magnetic field topology and differential rotation are fundamental signatures of the dynamo processes that generate the magnetic activity observed in the Sun and solar-type stars. To investigate how these dynamo processes evolve in stars with shallow convective zones, we present high-resolution spectropolarimetric observations of the young GO dwarf HD 171488 over three epochs. Using the Zeeman–Doppler tomographic imaging technique, we have reconstructed surface brightness images that are dominated by polar and high-latitude starspots and a magnetic field topology that shows large-scale radial and azimuthal magnetic field components. Over the time-span of our observations, we do not observe a reversal of the magnetic field polarity as has been observed in other solar-type stars with shallow convective zones. The phase coverage of our data was sufficient to determine the differential rotation for two epochs where in conjunction with previous work, we conclude that there is no evidence for the temporal evolution of differential rotation.

Item ID: 16624
Item Type: Article (Refereed Research - C1)
Keywords: stars: activity; stars: individual: HD 171488; stars: magnetic field; stars: solar-type; starspots
ISSN: 1365-2966
Date Deposited: 16 Jun 2011 06:55
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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