A BCool magnetic snapshot survey of solar-type stars

S. C. Marsden; P. Petit; S. V. Jeffers; J. Morin; R. Fares; A. Reiners; J. -D. do Nascimento; M. Auriere; J. Bouvier; B. D. Carter; C. Catala; B. Dintrans; J. -F. Donati; T. Gastine; M. Jardine; R. Konstantinova-Antova; J. Lanoux; F. Lignieres; A. Morgenthaler; J. C. Ramirez-Velez; S. Theado; V. Van Grootel; BCool Collaboration

doi:10.1093/mnras/stu1663

A BCool magnetic snapshot survey of solar-type stars

S. C. Marsden^*, P. Petit, S. V. Jeffers, J. Morin, R. Fares, A. Reiners, J. -D. do Nascimento, M. Auriere, J. Bouvier, B. D. Carter, C. Catala, B. Dintrans, J. -F. Donati, T. Gastine, M. Jardine, R. Konstantinova-Antova, J. Lanoux, F. Lignieres, A. Morgenthaler, J. C. Ramirez-VelezS. Theado, V. Van Grootel, BCool Collaboration

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 |B_l| (|B_l|_mean) was also found to be higher (5.7 G) than |B_l|_mean measured for the G-dwarfs (3.2 G) and the F-dwarfs (3.3 G). For the sample as a whole, |B_l|_mean increases with rotation rate and decreases with age, and the upper envelope for |B_l| 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.

Original language	English
Pages (from-to)	3517-3536
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	444
Issue number	4
Early online date	17 Sept 2014
DOIs	https://doi.org/10.1093/mnras/stu1663
Publication status	Published - 11 Nov 2014

Keywords

Line: profiles
Magnetic fields
Stars: activity
Main-sequence stars
Surface differential rotation
Geneva-Copenhagen survey
H-Alpha emission
Low-mass stars
Chromospheric activity
Galactic disk
Active stars
Nearby stars
Stellar polarimetry

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10.1093/mnras/stu1663

Jeffers_2014_MNRAS_ABCcool
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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Marsden, S. C., Petit, P., Jeffers, S. V., Morin, J., Fares, R., Reiners, A., do Nascimento, J. .-D., Auriere, M., Bouvier, J., Carter, B. D., Catala, C., Dintrans, B., Donati, J. .-F., Gastine, T., Jardine, M., Konstantinova-Antova, R., Lanoux, J., Lignieres, F., Morgenthaler, A., ... BCool Collaboration (2014). A BCool magnetic snapshot survey of solar-type stars. Monthly Notices of the Royal Astronomical Society, 444(4), 3517-3536. https://doi.org/10.1093/mnras/stu1663

@article{d9edc18cbaea45e9a66a694351e8927d,

title = "A BCool magnetic snapshot survey of solar-type stars",

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.",

keywords = "Line: profiles, Magnetic fields, Stars: activity, Main-sequence stars, Surface differential rotation, Geneva-Copenhagen survey, H-Alpha emission, Low-mass stars, Chromospheric activity, Galactic disk, Active stars, Nearby stars, Stellar polarimetry",

author = "Marsden, {S. C.} and P. Petit and Jeffers, {S. V.} and J. Morin and R. Fares and A. Reiners and {do Nascimento}, {J. -D.} and M. Auriere and J. Bouvier and Carter, {B. D.} and C. Catala and B. Dintrans and Donati, {J. -F.} and T. Gastine and M. Jardine and R. Konstantinova-Antova and J. Lanoux and F. Lignieres and A. Morgenthaler and Ramirez-Velez, {J. C.} and S. Theado and {Van Grootel}, V. and {BCool Collaboration}",

note = "SVJ acknowledges research funding by the Deutsche Forschungsgemeinschaft (DFG) under grant SFB 963/1, project A16. JM was funded by a fellowship of the Alexander von Humboldt Foundation in G{\"o}ttingen. RF acknowledges funding from the STFC.",

year = "2014",

month = nov,

day = "11",

doi = "10.1093/mnras/stu1663",

language = "English",

volume = "444",

pages = "3517--3536",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Marsden, SC, Petit, P, Jeffers, SV, Morin, J, Fares, R, Reiners, A, do Nascimento, J-D, Auriere, M, Bouvier, J, Carter, BD, Catala, C, Dintrans, B, Donati, J-F, Gastine, T, Jardine, M, Konstantinova-Antova, R, Lanoux, J, Lignieres, F, Morgenthaler, A, Ramirez-Velez, JC, Theado, S, Van Grootel, V & BCool Collaboration 2014, 'A BCool magnetic snapshot survey of solar-type stars', Monthly Notices of the Royal Astronomical Society, vol. 444, no. 4, pp. 3517-3536. https://doi.org/10.1093/mnras/stu1663

TY - JOUR

T1 - A BCool magnetic snapshot survey of solar-type stars

AU - Marsden, S. C.

AU - Petit, P.

AU - Jeffers, S. V.

AU - Morin, J.

AU - Fares, R.

AU - Reiners, A.

AU - do Nascimento, J. -D.

AU - Auriere, M.

AU - Bouvier, J.

AU - Carter, B. D.

AU - Catala, C.

AU - Dintrans, B.

AU - Donati, J. -F.

AU - Gastine, T.

AU - Jardine, M.

AU - Konstantinova-Antova, R.

AU - Lanoux, J.

AU - Lignieres, F.

AU - Morgenthaler, A.

AU - Ramirez-Velez, J. C.

AU - Theado, S.

AU - Van Grootel, V.

AU - BCool Collaboration

N1 - SVJ acknowledges research funding by the Deutsche Forschungsgemeinschaft (DFG) under grant SFB 963/1, project A16. JM was funded by a fellowship of the Alexander von Humboldt Foundation in Göttingen. RF acknowledges funding from the STFC.

PY - 2014/11/11

Y1 - 2014/11/11

N2 - 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.

AB - 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.

KW - Line: profiles

KW - Magnetic fields

KW - Stars: activity

KW - Main-sequence stars

KW - Surface differential rotation

KW - Geneva-Copenhagen survey

KW - H-Alpha emission

KW - Low-mass stars

KW - Chromospheric activity

KW - Galactic disk

KW - Active stars

KW - Nearby stars

KW - Stellar polarimetry

UR - https://academic.oup.com/mnras/article/444/4/3517/1020893#78644720

U2 - 10.1093/mnras/stu1663

DO - 10.1093/mnras/stu1663

M3 - Article

SN - 0035-8711

VL - 444

SP - 3517

EP - 3536

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

A BCool magnetic snapshot survey of solar-type stars

Abstract

Keywords

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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

Moira Mary Jardine

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A BCool magnetic snapshot survey of solar-type stars

Abstract

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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

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Moira Mary Jardine

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