A radio and optical study of the active young F star HR 1817 (=HD 35850)

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dc.authoridCarter, Bradley/0000-0003-0035-8769
dc.authoridMengel, Matthew/0000-0002-7830-6822
dc.contributor.authorBudding, E
dc.contributor.authorCarter, BD
dc.contributor.authorMengel, MW
dc.contributor.authorSlee, OB
dc.contributor.authorDonati, JF
dc.date.accessioned2025-01-27T20:27:41Z
dc.date.available2025-01-27T20:27:41Z
dc.date.issued2002
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThis paper presents the results of a multiwavelength observational study of the active young F-type star HR 1817. The star was monitored at 4.80 and 8.64 GHz over 2 x 12 h allocations with the Australia Telescope Compact Array on 8 and 9 December, 2000. The Anglo-Australian Telescope was used for simultaneous optical spectropolarimetry during a 2 h period on 9 December. The low levels of observed radio emission have characteristics that are similar to those seen in other active stars, and a gyrosynchrotron mechanism is proposed to explain them; this is supported by the relatively low fractions of circular polarisation measured in HR 1817. Comparison of the emissions from 4.80 and 8.64 GHz shows a very strong cross-correlation peak, indicative of a common origin, although the shift of this peak indicates that 8.64 GHz variations tend to precede those at 4.80 GHz by, typically, similar to20 min. The optical spectropolarimetry reveals polarisation signals characteristic of surface magnetic fields, with profile changes indicating a complex dynamo-type magnetic topology is present on the star. This result makes HR 1817 the star with the earliest spectral type on which dynamo magnetic fields have been detected directly up to now.
dc.identifier.doi10.1071/AS02021
dc.identifier.endpage533
dc.identifier.issn1323-3580
dc.identifier.issue4
dc.identifier.scopus2-s2.0-4644262149
dc.identifier.scopusqualityQ1
dc.identifier.startpage527
dc.identifier.urihttps://doi.org/10.1071/AS02021
dc.identifier.urihttps://hdl.handle.net/20.500.12428/22753
dc.identifier.volume19
dc.identifier.wosWOS:000179730700012
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherC S I R O Publishing
dc.relation.ispartofPublications of The Astronomical Society of Australia
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectstars : activity
dc.subjectstars : coronae
dc.subjectstars : individual (HR 1817)
dc.subjectradio continuum : stars
dc.subjecttechniques : miscellaneous
dc.subjecttechniques : Zeeman Doppler imaging
dc.titleA radio and optical study of the active young F star HR 1817 (=HD 35850)
dc.typeArticle

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