Spectropolarimetric study of Mira-type variable stars
Everything started back in 1978, with the discovery by McLean & Coyne of hydrogen emission lines, undergoing polarization, on the variable star Omicron Ceti (a.k.a. Mira). Those emissions seemed likely to be linked with a shockwave propagating through the stellar atmosphere. Further observations...
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2009
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ftluleatu:oai:DiVA.org:ltu-56828 2023-05-15T18:50:45+02:00 Spectropolarimetric study of Mira-type variable stars Fabas, Nicolas 2009 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-56828 eng eng http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-56828 Local d91cd82c-4589-4c7f-9b3b-5fcecc55670d info:eu-repo/semantics/openAccess Physics Chemistry Maths Fysik Kemi Matematik Student thesis info:eu-repo/semantics/bachelorThesis text 2009 ftluleatu 2022-10-25T20:52:55Z Everything started back in 1978, with the discovery by McLean & Coyne of hydrogen emission lines, undergoing polarization, on the variable star Omicron Ceti (a.k.a. Mira). Those emissions seemed likely to be linked with a shockwave propagating through the stellar atmosphere. Further observations showed that emission -, and thus polarization -, lasted during 80% of luminosity variation period. According to shockwave theory, a magnetic field should appear just behind the shock front, inducing polarization, but this field has never been conclusively detected so far. Here, we present a full spectropolarimetric study (on the four Stokes parameters I,Q,U and V), made with instrument NARVAL at TBL (Telescope Bernard Lyot) in the French Pyrenees, aimed toward the complete characterization of the polarization behavior with respect to the shockwave intensity. The detected signatures are most probably of magnetic origin. Validerat; 20101217 (root) Bachelor Thesis narval narval Luleå University of Technology Publications (DiVA) Mira ENVELOPE(10.500,10.500,-70.417,-70.417) |
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Open Polar |
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Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
Physics Chemistry Maths Fysik Kemi Matematik |
spellingShingle |
Physics Chemistry Maths Fysik Kemi Matematik Fabas, Nicolas Spectropolarimetric study of Mira-type variable stars |
topic_facet |
Physics Chemistry Maths Fysik Kemi Matematik |
description |
Everything started back in 1978, with the discovery by McLean & Coyne of hydrogen emission lines, undergoing polarization, on the variable star Omicron Ceti (a.k.a. Mira). Those emissions seemed likely to be linked with a shockwave propagating through the stellar atmosphere. Further observations showed that emission -, and thus polarization -, lasted during 80% of luminosity variation period. According to shockwave theory, a magnetic field should appear just behind the shock front, inducing polarization, but this field has never been conclusively detected so far. Here, we present a full spectropolarimetric study (on the four Stokes parameters I,Q,U and V), made with instrument NARVAL at TBL (Telescope Bernard Lyot) in the French Pyrenees, aimed toward the complete characterization of the polarization behavior with respect to the shockwave intensity. The detected signatures are most probably of magnetic origin. Validerat; 20101217 (root) |
format |
Bachelor Thesis |
author |
Fabas, Nicolas |
author_facet |
Fabas, Nicolas |
author_sort |
Fabas, Nicolas |
title |
Spectropolarimetric study of Mira-type variable stars |
title_short |
Spectropolarimetric study of Mira-type variable stars |
title_full |
Spectropolarimetric study of Mira-type variable stars |
title_fullStr |
Spectropolarimetric study of Mira-type variable stars |
title_full_unstemmed |
Spectropolarimetric study of Mira-type variable stars |
title_sort |
spectropolarimetric study of mira-type variable stars |
publishDate |
2009 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-56828 |
long_lat |
ENVELOPE(10.500,10.500,-70.417,-70.417) |
geographic |
Mira |
geographic_facet |
Mira |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-56828 Local d91cd82c-4589-4c7f-9b3b-5fcecc55670d |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766244499900596224 |