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Article: First conclusive evidence for rotational modulation of stellar radio emission

TitleFirst conclusive evidence for rotational modulation of stellar radio emission
Authors
KeywordsRadio Continuum: Stars
Stars : Magnetic Fields
Stars: Activity
Stars: Coronae
Stars: Late-Type
Issue Date1992
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 1992, v. 388 n. 1 PART 2, p. L27-L30 How to Cite?
AbstractWe present what we believe to be the first conclusive evidence for rotational modulation of stellar radio emission, observed on the young and rapidly rotating K1 dwarf star AB Doradus (HD 36705). The radio emission of this star peaked near two stellar longitudes where large starspots have been observed to form preferentially. One of the peaks in radio emission was coincident with the central meridian passage of a large starspot; the starspot associated with the other peak may have been overwhelmed by the visible starspot. The modulation in the radio emission was probably caused by a combination of two factors: (1) occultation of the starspot active regions by the stellar disk, and (2) high directivity of the radio emission from these regions. The radio emission of AB Dor is nonthermal, and requires semicontinuous acceleration of electrons to high energies. This observation provides the first evidence that the radio emission of late-type stars, like that of the Sun, originates from regions of strong coronal magnetic fields associated with starspots.
Persistent Identifierhttp://hdl.handle.net/10722/174670
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369

 

DC FieldValueLanguage
dc.contributor.authorLim, Jen_US
dc.contributor.authorNelson, GJen_US
dc.contributor.authorCastro, Cen_US
dc.contributor.authorKilkenny, Den_US
dc.contributor.authorVan Wyk, Fen_US
dc.date.accessioned2012-11-26T08:46:48Z-
dc.date.available2012-11-26T08:46:48Z-
dc.date.issued1992en_US
dc.identifier.citationAstrophysical Journal Letters, 1992, v. 388 n. 1 PART 2, p. L27-L30en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/174670-
dc.description.abstractWe present what we believe to be the first conclusive evidence for rotational modulation of stellar radio emission, observed on the young and rapidly rotating K1 dwarf star AB Doradus (HD 36705). The radio emission of this star peaked near two stellar longitudes where large starspots have been observed to form preferentially. One of the peaks in radio emission was coincident with the central meridian passage of a large starspot; the starspot associated with the other peak may have been overwhelmed by the visible starspot. The modulation in the radio emission was probably caused by a combination of two factors: (1) occultation of the starspot active regions by the stellar disk, and (2) high directivity of the radio emission from these regions. The radio emission of AB Dor is nonthermal, and requires semicontinuous acceleration of electrons to high energies. This observation provides the first evidence that the radio emission of late-type stars, like that of the Sun, originates from regions of strong coronal magnetic fields associated with starspots.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.subjectRadio Continuum: Starsen_US
dc.subjectStars : Magnetic Fieldsen_US
dc.subjectStars: Activityen_US
dc.subjectStars: Coronaeen_US
dc.subjectStars: Late-Typeen_US
dc.titleFirst conclusive evidence for rotational modulation of stellar radio emissionen_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.scopuseid_2-s2.0-0011107957en_US
dc.identifier.volume388en_US
dc.identifier.issue1 PART 2en_US
dc.identifier.spageL27en_US
dc.identifier.epageL30en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLim, J=7403453870en_US
dc.identifier.scopusauthoridNelson, GJ=16459833800en_US
dc.identifier.scopusauthoridCastro, C=43961039500en_US
dc.identifier.scopusauthoridKilkenny, D=7003502648en_US
dc.identifier.scopusauthoridVan Wyk, F=7004188130en_US

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