Magnetic field and activity phenomena of the K2 dwarf V471 Tau
ABSTRACT We analyse spectropolarimetric data of the pre-cataclysmic variable binary system V471 Tau obtained with ESPaDOnS at the Canada–France–Hawaii Telescope in two observational campaigns (in 2004 November/December and 2005 December). Using Zeeman–Doppler imaging, we reconstruct the distribution...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2021-06, Vol.504 (2), p.1969-1988 |
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container_end_page | 1988 |
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container_issue | 2 |
container_start_page | 1969 |
container_title | Monthly notices of the Royal Astronomical Society |
container_volume | 504 |
creator | Zaire, B Donati, J-F Klein, B |
description | ABSTRACT
We analyse spectropolarimetric data of the pre-cataclysmic variable binary system V471 Tau obtained with ESPaDOnS at the Canada–France–Hawaii Telescope in two observational campaigns (in 2004 November/December and 2005 December). Using Zeeman–Doppler imaging, we reconstruct the distribution of brightness map and large-scale magnetic field of the K2 dwarf at both epochs, as well as the amount of differential rotation by which surface maps are sheared. We detect significant fluctuations in the surface shear between the two campaigns. It goes from about twice the solar differential rotation rate to less than the solar value in a 1-yr interval. We conclude that the differential rotation fluctuations obtained for the K2 dwarf resemble those detected on the single-star analogue AB Dor, although even larger amplitudes of variation are seen in the K2 dwarf of V471 Tau. Finally, we show that the differential rotation results obtained in this work do not favour an Applegate mechanism operating in the V471 Tau system, at least in its standard form, but leave room for explaining the observed orbital period fluctuations with exotic forms of similar phenomena based on dynamo processes operating within the convective zone of the K2 star. |
doi_str_mv | 10.1093/mnras/stab1019 |
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We analyse spectropolarimetric data of the pre-cataclysmic variable binary system V471 Tau obtained with ESPaDOnS at the Canada–France–Hawaii Telescope in two observational campaigns (in 2004 November/December and 2005 December). Using Zeeman–Doppler imaging, we reconstruct the distribution of brightness map and large-scale magnetic field of the K2 dwarf at both epochs, as well as the amount of differential rotation by which surface maps are sheared. We detect significant fluctuations in the surface shear between the two campaigns. It goes from about twice the solar differential rotation rate to less than the solar value in a 1-yr interval. We conclude that the differential rotation fluctuations obtained for the K2 dwarf resemble those detected on the single-star analogue AB Dor, although even larger amplitudes of variation are seen in the K2 dwarf of V471 Tau. Finally, we show that the differential rotation results obtained in this work do not favour an Applegate mechanism operating in the V471 Tau system, at least in its standard form, but leave room for explaining the observed orbital period fluctuations with exotic forms of similar phenomena based on dynamo processes operating within the convective zone of the K2 star.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stab1019</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Cataclysmic variables ; Differential rotation ; Magnetic fields ; Orbits ; Sciences of the Universe</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2021-06, Vol.504 (2), p.1969-1988</ispartof><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society 2021</rights><rights>2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c375t-583f3ec2750bf4aa2c2e4f6ad595e988a766b92505822949fb79ba1bb013d7af3</citedby><cites>FETCH-LOGICAL-c375t-583f3ec2750bf4aa2c2e4f6ad595e988a766b92505822949fb79ba1bb013d7af3</cites><orcidid>0000-0002-9328-9530 ; 0000-0001-5541-2887 ; 0000-0003-0637-5236</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,1598,27901,27902</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stab1019$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc><backlink>$$Uhttps://hal.science/hal-03433159$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Zaire, B</creatorcontrib><creatorcontrib>Donati, J-F</creatorcontrib><creatorcontrib>Klein, B</creatorcontrib><title>Magnetic field and activity phenomena of the K2 dwarf V471 Tau</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
We analyse spectropolarimetric data of the pre-cataclysmic variable binary system V471 Tau obtained with ESPaDOnS at the Canada–France–Hawaii Telescope in two observational campaigns (in 2004 November/December and 2005 December). Using Zeeman–Doppler imaging, we reconstruct the distribution of brightness map and large-scale magnetic field of the K2 dwarf at both epochs, as well as the amount of differential rotation by which surface maps are sheared. We detect significant fluctuations in the surface shear between the two campaigns. It goes from about twice the solar differential rotation rate to less than the solar value in a 1-yr interval. We conclude that the differential rotation fluctuations obtained for the K2 dwarf resemble those detected on the single-star analogue AB Dor, although even larger amplitudes of variation are seen in the K2 dwarf of V471 Tau. Finally, we show that the differential rotation results obtained in this work do not favour an Applegate mechanism operating in the V471 Tau system, at least in its standard form, but leave room for explaining the observed orbital period fluctuations with exotic forms of similar phenomena based on dynamo processes operating within the convective zone of the K2 star.</description><subject>Cataclysmic variables</subject><subject>Differential rotation</subject><subject>Magnetic fields</subject><subject>Orbits</subject><subject>Sciences of the Universe</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkM9LwzAYhoMoOKdXzwFPHrrlS5q2uQhjqBMnXqbX8KVNXMfW1qSd7L-3c_44evh44ePh5eEl5BLYCJgS403lMYxDiwYYqCMyAJHIiKskOSYDxoSMshTglJyFsGKMxYInA3LzhG-VbcucutKuC4pVf3lbbst2R5ulreqNrZDWjrZLSx85LT7QO_oap0AX2J2TE4frYC--c0he7m4X01k0f75_mE7mUS5S2UYyE07YnKeSGRcj8pzb2CVYSCWtyjJMk8QoLpnMOFexciZVBsEYBqJI0YkhuT70LnGtG19u0O90jaWeTeZ6_2MiFgKk2kLPXh3YxtfvnQ2tXtWdr3o9LUAA43HW-wzJ6EDlvg7BW_dbC0zv99Rfe-qfPf8U6q75j_0E2MB1rg</recordid><startdate>20210601</startdate><enddate>20210601</enddate><creator>Zaire, B</creator><creator>Donati, J-F</creator><creator>Klein, B</creator><general>Oxford University Press</general><general>Oxford University Press (OUP): Policy P - Oxford Open Option A</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-9328-9530</orcidid><orcidid>https://orcid.org/0000-0001-5541-2887</orcidid><orcidid>https://orcid.org/0000-0003-0637-5236</orcidid></search><sort><creationdate>20210601</creationdate><title>Magnetic field and activity phenomena of the K2 dwarf V471 Tau</title><author>Zaire, B ; Donati, J-F ; Klein, B</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c375t-583f3ec2750bf4aa2c2e4f6ad595e988a766b92505822949fb79ba1bb013d7af3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Cataclysmic variables</topic><topic>Differential rotation</topic><topic>Magnetic fields</topic><topic>Orbits</topic><topic>Sciences of the Universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zaire, B</creatorcontrib><creatorcontrib>Donati, J-F</creatorcontrib><creatorcontrib>Klein, B</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Zaire, B</au><au>Donati, J-F</au><au>Klein, B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic field and activity phenomena of the K2 dwarf V471 Tau</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2021-06-01</date><risdate>2021</risdate><volume>504</volume><issue>2</issue><spage>1969</spage><epage>1988</epage><pages>1969-1988</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
We analyse spectropolarimetric data of the pre-cataclysmic variable binary system V471 Tau obtained with ESPaDOnS at the Canada–France–Hawaii Telescope in two observational campaigns (in 2004 November/December and 2005 December). Using Zeeman–Doppler imaging, we reconstruct the distribution of brightness map and large-scale magnetic field of the K2 dwarf at both epochs, as well as the amount of differential rotation by which surface maps are sheared. We detect significant fluctuations in the surface shear between the two campaigns. It goes from about twice the solar differential rotation rate to less than the solar value in a 1-yr interval. We conclude that the differential rotation fluctuations obtained for the K2 dwarf resemble those detected on the single-star analogue AB Dor, although even larger amplitudes of variation are seen in the K2 dwarf of V471 Tau. Finally, we show that the differential rotation results obtained in this work do not favour an Applegate mechanism operating in the V471 Tau system, at least in its standard form, but leave room for explaining the observed orbital period fluctuations with exotic forms of similar phenomena based on dynamo processes operating within the convective zone of the K2 star.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stab1019</doi><tpages>20</tpages><orcidid>https://orcid.org/0000-0002-9328-9530</orcidid><orcidid>https://orcid.org/0000-0001-5541-2887</orcidid><orcidid>https://orcid.org/0000-0003-0637-5236</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Cataclysmic variables Differential rotation Magnetic fields Orbits Sciences of the Universe |
title | Magnetic field and activity phenomena of the K2 dwarf V471 Tau |
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