Exploring the magnetic topologies of cool stars

J. Morin; J.-F. Donati; P. Petit; L. Albert; M. Auriére; R. Cabanac; C. Catala; X. Delfosse; B. Dintrans; R. Fares; T. Forveille; T. Gastine; M. Jardine; R. Konstantinova-Antova; J. Lanoux; F. Lignires; A. Morgenthaler; F. Paletou; J. C. Ramirez Velez; S. K. Solanki; S. Thado; V. Van Grootel

doi:10.1017/S1743921311015213

Exploring the magnetic topologies of cool stars

J. Morin, J.-F. Donati, P. Petit, L. Albert, M. Auriére, R. Cabanac, C. Catala, X. Delfosse, B. Dintrans, R. Fares, T. Forveille, T. Gastine, M. Jardine, R. Konstantinova-Antova, J. Lanoux, F. Lignires, A. Morgenthaler, F. Paletou, J. C. Ramirez Velez, S. K. SolankiS. Thado, V. Van Grootel

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

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Abstract

Magnetic fields of cool stars can be directly investigated through the study of the Zeeman effect on photospheric spectral lines using several approaches. With spectroscopic measurement in unpolarised light, the total magnetic flux averaged over the stellar disc can be derived but very little information on the field geometry is available. Spectropolarimetry provides a complementary information on the large-scale magnetic topology. With Zeeman-Doppler Imaging (ZDI), this information can be retrieved to produce a map of the vector magnetic field at the surface of the star, and in particular to assess the relative importance of the poloidal and toroidal components as well as the degree of axisymmetry of the field distribution. The development of high-performance spectropolarimeters associated with multi-lines techniques and ZDI allows us to explore magnetic topologies throughout the Hertzsprung-Russel diagram, on stars spanning a wide range of mass, age and rotation period. These observations bring novel constraints on magnetic field generation by dynamo effect in cool stars. In particular, the study of solar twins brings new insight on the impact of rotation on the solar dynamo, whereas the detection of strong and stable dipolar magnetic fields on fully convective stars questions the precise role of the tachocline in this process.

Original language	English
Title of host publication	The Physics of Sun and Star Spots
Editors	D.P. Choudhary, K.G. Strassmeier
Publisher	Cambridge University Press
Pages	181-187
ISBN (Print)	9780521760621
DOIs	https://doi.org/10.1017/S1743921311015213
Publication status	Published - Aug 2011
Event	The Physics of Sun and Star Spots - Los Angeles, United States Duration: 22 Aug 2010 → 26 Aug 2010

Publication series

Name	Proceedings of the International Astronomical Union
Publisher	Cambridge University Press
Number	S273
Volume	6
ISSN (Print)	1743-9213
ISSN (Electronic)	1743-9221

Conference

Conference	The Physics of Sun and Star Spots
Country/Territory	United States
City	Los Angeles
Period	22/08/10 → 26/08/10

Keywords

Stars: low-mass
Brown dwarfs
Stars: magnetic fields
Stars: activity
Stars: rotation
Techniques: spectroscopic
Techniques: polarimetric

Access to Document

10.1017/S1743921311015213

Morin_2011_Exploring_PIAU_AAM
© 2011, International Astronomical Union. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.cambridge.org / https://doi.org/10.1017/S1743921311015213
Accepted author manuscript, 188 KB

http://adsabs.harvard.edu/abs/2011IAUS..273..181M

Cite this

Morin, J., Donati, J.-F., Petit, P., Albert, L., Auriére, M., Cabanac, R., Catala, C., Delfosse, X., Dintrans, B., Fares, R., Forveille, T., Gastine, T., Jardine, M., Konstantinova-Antova, R., Lanoux, J., Lignires, F., Morgenthaler, A., Paletou, F., Velez, J. C. R., ... Van Grootel, V. (2011). Exploring the magnetic topologies of cool stars. In D. P. Choudhary, & K. G. Strassmeier (Eds.), The Physics of Sun and Star Spots (pp. 181-187). (Proceedings of the International Astronomical Union; Vol. 6, No. S273). Cambridge University Press. https://doi.org/10.1017/S1743921311015213

@inproceedings{544dc06e2ffe44fab66a765f01b9df4c,

title = "Exploring the magnetic topologies of cool stars",

abstract = "Magnetic fields of cool stars can be directly investigated through the study of the Zeeman effect on photospheric spectral lines using several approaches. With spectroscopic measurement in unpolarised light, the total magnetic flux averaged over the stellar disc can be derived but very little information on the field geometry is available. Spectropolarimetry provides a complementary information on the large-scale magnetic topology. With Zeeman-Doppler Imaging (ZDI), this information can be retrieved to produce a map of the vector magnetic field at the surface of the star, and in particular to assess the relative importance of the poloidal and toroidal components as well as the degree of axisymmetry of the field distribution. The development of high-performance spectropolarimeters associated with multi-lines techniques and ZDI allows us to explore magnetic topologies throughout the Hertzsprung-Russel diagram, on stars spanning a wide range of mass, age and rotation period. These observations bring novel constraints on magnetic field generation by dynamo effect in cool stars. In particular, the study of solar twins brings new insight on the impact of rotation on the solar dynamo, whereas the detection of strong and stable dipolar magnetic fields on fully convective stars questions the precise role of the tachocline in this process.",

keywords = "Stars: low-mass, Brown dwarfs, Stars: magnetic fields, Stars: activity, Stars: rotation, Techniques: spectroscopic, Techniques: polarimetric",

author = "J. Morin and J.-F. Donati and P. Petit and L. Albert and M. Auri{\'e}re and R. Cabanac and C. Catala and X. Delfosse and B. Dintrans and R. Fares and T. Forveille and T. Gastine and M. Jardine and R. Konstantinova-Antova and J. Lanoux and F. Lignires and A. Morgenthaler and F. Paletou and Velez, {J. C. Ramirez} and Solanki, {S. K.} and S. Thado and {Van Grootel}, V.",

year = "2011",

month = aug,

doi = "10.1017/S1743921311015213",

language = "English",

isbn = "9780521760621",

series = "Proceedings of the International Astronomical Union",

publisher = "Cambridge University Press",

number = "S273",

pages = "181--187",

editor = "Choudhary, {D.P. } and K.G. Strassmeier",

booktitle = "The Physics of Sun and Star Spots",

address = "United Kingdom",

note = "The Physics of Sun and Star Spots ; Conference date: 22-08-2010 Through 26-08-2010",

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Morin, J, Donati, J-F, Petit, P, Albert, L, Auriére, M, Cabanac, R, Catala, C, Delfosse, X, Dintrans, B, Fares, R, Forveille, T, Gastine, T, Jardine, M, Konstantinova-Antova, R, Lanoux, J, Lignires, F, Morgenthaler, A, Paletou, F, Velez, JCR, Solanki, SK, Thado, S & Van Grootel, V 2011, Exploring the magnetic topologies of cool stars. in DP Choudhary & KG Strassmeier (eds), The Physics of Sun and Star Spots. Proceedings of the International Astronomical Union, no. S273, vol. 6, Cambridge University Press, pp. 181-187, The Physics of Sun and Star Spots, Los Angeles, United States, 22/08/10. https://doi.org/10.1017/S1743921311015213

Exploring the magnetic topologies of cool stars. / Morin, J.; Donati, J.-F.; Petit, P. et al.
The Physics of Sun and Star Spots. ed. / D.P. Choudhary; K.G. Strassmeier. Cambridge University Press, 2011. p. 181-187 (Proceedings of the International Astronomical Union; Vol. 6, No. S273).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Exploring the magnetic topologies of cool stars

AU - Morin, J.

AU - Donati, J.-F.

AU - Petit, P.

AU - Albert, L.

AU - Auriére, M.

AU - Cabanac, R.

AU - Catala, C.

AU - Delfosse, X.

AU - Dintrans, B.

AU - Fares, R.

AU - Forveille, T.

AU - Gastine, T.

AU - Jardine, M.

AU - Konstantinova-Antova, R.

AU - Lanoux, J.

AU - Lignires, F.

AU - Morgenthaler, A.

AU - Paletou, F.

AU - Velez, J. C. Ramirez

AU - Solanki, S. K.

AU - Thado, S.

AU - Van Grootel, V.

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N2 - Magnetic fields of cool stars can be directly investigated through the study of the Zeeman effect on photospheric spectral lines using several approaches. With spectroscopic measurement in unpolarised light, the total magnetic flux averaged over the stellar disc can be derived but very little information on the field geometry is available. Spectropolarimetry provides a complementary information on the large-scale magnetic topology. With Zeeman-Doppler Imaging (ZDI), this information can be retrieved to produce a map of the vector magnetic field at the surface of the star, and in particular to assess the relative importance of the poloidal and toroidal components as well as the degree of axisymmetry of the field distribution. The development of high-performance spectropolarimeters associated with multi-lines techniques and ZDI allows us to explore magnetic topologies throughout the Hertzsprung-Russel diagram, on stars spanning a wide range of mass, age and rotation period. These observations bring novel constraints on magnetic field generation by dynamo effect in cool stars. In particular, the study of solar twins brings new insight on the impact of rotation on the solar dynamo, whereas the detection of strong and stable dipolar magnetic fields on fully convective stars questions the precise role of the tachocline in this process.

AB - Magnetic fields of cool stars can be directly investigated through the study of the Zeeman effect on photospheric spectral lines using several approaches. With spectroscopic measurement in unpolarised light, the total magnetic flux averaged over the stellar disc can be derived but very little information on the field geometry is available. Spectropolarimetry provides a complementary information on the large-scale magnetic topology. With Zeeman-Doppler Imaging (ZDI), this information can be retrieved to produce a map of the vector magnetic field at the surface of the star, and in particular to assess the relative importance of the poloidal and toroidal components as well as the degree of axisymmetry of the field distribution. The development of high-performance spectropolarimeters associated with multi-lines techniques and ZDI allows us to explore magnetic topologies throughout the Hertzsprung-Russel diagram, on stars spanning a wide range of mass, age and rotation period. These observations bring novel constraints on magnetic field generation by dynamo effect in cool stars. In particular, the study of solar twins brings new insight on the impact of rotation on the solar dynamo, whereas the detection of strong and stable dipolar magnetic fields on fully convective stars questions the precise role of the tachocline in this process.

KW - Stars: low-mass

KW - Brown dwarfs

KW - Stars: magnetic fields

KW - Stars: activity

KW - Stars: rotation

KW - Techniques: spectroscopic

KW - Techniques: polarimetric

U2 - 10.1017/S1743921311015213

DO - 10.1017/S1743921311015213

M3 - Conference contribution

SN - 9780521760621

T3 - Proceedings of the International Astronomical Union

SP - 181

EP - 187

BT - The Physics of Sun and Star Spots

A2 - Choudhary, D.P.

A2 - Strassmeier, K.G.

PB - Cambridge University Press

T2 - The Physics of Sun and Star Spots

Y2 - 22 August 2010 through 26 August 2010

ER -

Exploring the magnetic topologies of cool stars

Abstract

Publication series

Conference

Keywords

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