A Bcool magnetic snapshot survey of solar-type stars

Marsden, S. C. and Petit, P. and Jeffers, S. V. and Morin, J. and Fares, R. and Reiners, A. and do Nascimento Jr., J.-D. and Auriere, M. and Bouvier, J. and Carter, B. D. and Catala, C. and Dintrans, B. and Donati, J. -F. and Gastine, T. and Jardine, M. and Konstantinova-Antova, R. and Lanoux, J. and Lignieres, F. and Morgenthaler, A. and Ramirez-Velez, J. C. and Theado, S. and Van Grootel, V. (2014) A Bcool magnetic snapshot survey of solar-type stars. Monthly Notices of the Royal Astronomical Society, 444 (4). pp. 3517-3536. ISSN 0035-8711

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Abstract

We present the results of a major high-resolution spectropolarimetric BCool project magnetic survey of 170 solar-type stars. Surface magnetic fields were detected on 67 stars, with 21 classified as mature solar-type stars, a result that increases by a factor of 4 the number of
mature solar-type stars on which magnetic fields have been observed. In addition, a magnetic field was detected for 3 out of 18 of the subgiant stars surveyed. For the population of K-dwarfs, the mean value of |Bl|(|Bl| mean) was also found to be higher (5.7 G) than |Bl| mean measured for the G-dwarfs (3.2 G) and the F-dwarfs (3.3 G). For the sample as a whole, |Bl| mean increases with rotation rate and decreases with age, and the upper envelope for |Bl| correlates well with the observed chromospheric emission. Stars with a chromospheric S-index greater than about 0.2 show a high magnetic field detection rate and so offer optimal targets for future studies. This survey constitutes the most extensive spectropolarimetric survey of cool stars
undertaken to date, and suggests that it is feasible to pursue magnetic mapping of a wide range of moderately active solar-type stars to improve our understanding of their surface fields and dynamos.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright 2014 The Authors. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 27 Feb 2015 00:00
Last Modified: 24 Jan 2018 00:21
Uncontrolled Keywords: profiles; stars; magnetic fields
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020105 General Relativity and Gravitational Waves
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stu1663
URI: http://eprints.usq.edu.au/id/eprint/24512

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