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Article: Magnetic fields in M dwarfs: Rapid magnetic field variability in EV Lacertae

TitleMagnetic fields in M dwarfs: Rapid magnetic field variability in EV Lacertae
Authors
KeywordsStars: Individual (Ev Lacertae, Hh Andromedae)
Stars: Low-Mass, Brown Dwarfs
Stars: Magnetic Fields
Techniques: Polarimetric
Techniques: Spectroscopic
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2006, v. 646 II, p. L73-L76 How to Cite?
AbstractWe report here our spectropolarimetric observations obtained using the CFHT Espadons high-resolution spectrograph of two M dwarf stars that standard models suggest are fully convective: EV Lac (M3.5) and HH And (M5.5). The difference in their rotational velocity makes them good targets for studying the dependence of the magnetic field topology in M dwarfs on rotation. Our results reveal some aspects of the field topology in EV Lac and HH And. We measured mean longitudinal magnetic field strengths (B z) in EV Lac ranging from 18 ±3 to - 40 ± 3 G. The B z variations are seen to occur on a timescale of less than 50 minutes, which is significantly shorter than the rotation period, and are not due to a flaring event. We discuss some formation scenarios of the Zeeman signatures found in EV Lac. For HH And we could not detect circular polarization and thus we place an upper limit on B z of 5 G. © 2006. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175029
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPhanBao, Nen_US
dc.contributor.authorMartín, ELen_US
dc.contributor.authorDonati, JFen_US
dc.contributor.authorLim, Jen_US
dc.date.accessioned2012-11-26T08:48:51Z-
dc.date.available2012-11-26T08:48:51Z-
dc.date.issued2006en_US
dc.identifier.citationAstrophysical Journal Letters, 2006, v. 646 II, p. L73-L76en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175029-
dc.description.abstractWe report here our spectropolarimetric observations obtained using the CFHT Espadons high-resolution spectrograph of two M dwarf stars that standard models suggest are fully convective: EV Lac (M3.5) and HH And (M5.5). The difference in their rotational velocity makes them good targets for studying the dependence of the magnetic field topology in M dwarfs on rotation. Our results reveal some aspects of the field topology in EV Lac and HH And. We measured mean longitudinal magnetic field strengths (B z) in EV Lac ranging from 18 ±3 to - 40 ± 3 G. The B z variations are seen to occur on a timescale of less than 50 minutes, which is significantly shorter than the rotation period, and are not due to a flaring event. We discuss some formation scenarios of the Zeeman signatures found in EV Lac. For HH And we could not detect circular polarization and thus we place an upper limit on B z of 5 G. © 2006. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectStars: Individual (Ev Lacertae, Hh Andromedae)en_US
dc.subjectStars: Low-Mass, Brown Dwarfsen_US
dc.subjectStars: Magnetic Fieldsen_US
dc.subjectTechniques: Polarimetricen_US
dc.subjectTechniques: Spectroscopicen_US
dc.titleMagnetic fields in M dwarfs: Rapid magnetic field variability in EV Lacertaeen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/506591en_US
dc.identifier.scopuseid_2-s2.0-33747498432en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33747498432&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume646en_US
dc.identifier.issueIIen_US
dc.identifier.spageL73en_US
dc.identifier.epageL76en_US
dc.identifier.isiWOS:000239647200019-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridPhanBao, N=8719607900en_US
dc.identifier.scopusauthoridMartín, EL=7404092339en_US
dc.identifier.scopusauthoridDonati, JF=7006720613en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US

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