Direct Observation of the Radial Magnetic Field Gradient in HD 58260 from Spectropolarimetry of NLTE Lines in Emission

Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of speculation. In our contribution to this discussion we present spectropolarimetric evidence of the decrease of the radial component of the magn...

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Vydané v:The Astrophysical journal Ročník 925; číslo 1; s. 2 - 7
Hlavný autor: Giarrusso, Marina
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Philadelphia The American Astronomical Society 01.01.2022
IOP Publishing
Predmet:
Astrophysics
Atmosphere
Atomic spectroscopy
Emission
Energetic particles
Line spectra
Magnetic fields
Magnetic stars
Magnetospheres
Plasma astrophysics
Spectral line identification
Spectral line lists
Spectropolarimetry
Stars
Stellar atmospheres
Stellar magnetic fields
ISSN:0004-637X, 1538-4357
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Abstract Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of speculation. In our contribution to this discussion we present spectropolarimetric evidence of the decrease of the radial component of the magnetic field with altitude in the atmosphere of HD 58260, a B-type magnetic star on the main sequence. We show that the Stokes V profiles of metal lines in emission of the outer atmosphere are evidence for a field three times weaker than absorption lines from inner layers. The extra flow of energetic particles due to the magnetic-gradient pumping mechanism could be at the origin of the magnetospheres surrounding this class of stars and at the basis of the high-energy phenomena observed. We also list a series of spectral lines useful for measuring the surface field of early-type stars.
AbstractList Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of speculation. In our contribution to this discussion we present spectropolarimetric evidence of the decrease of the radial component of the magnetic field with altitude in the atmosphere of HD 58260, a B-type magnetic star on the main sequence. We show that the Stokes V profiles of metal lines in emission of the outer atmosphere are evidence for a field three times weaker than absorption lines from inner layers. The extra flow of energetic particles due to the magnetic-gradient pumping mechanism could be at the origin of the magnetospheres surrounding this class of stars and at the basis of the high-energy phenomena observed. We also list a series of spectral lines useful for measuring the surface field of early-type stars.
Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of speculation. In our contribution to this discussion we present spectropolarimetric evidence of the decrease of the radial component of the magnetic field with altitude in the atmosphere of HD 58260, a B-type magnetic star on the main sequence. We show that the Stokes V profiles of metal lines in emission of the outer atmosphere are evidence for a field three times weaker than absorption lines from inner layers. The extra flow of energetic particles due to the magnetic-gradient pumping mechanism could be at the origin of the magnetospheres surrounding this class of stars and at the basis of the high-energy phenomena observed. We also list a series of spectral lines useful for measuring the surface field of early-type stars.
Author Giarrusso, Marina
Author_xml – sequence: 1
  givenname: Marina
  orcidid: 0000-0002-4453-1597
  surname: Giarrusso
  fullname: Giarrusso, Marina
  organization: INFN—Laboratori Nazionali del Sud, Via S. Sofia 62, I–95123 Catania, Italy
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CitedBy_id crossref_primary_10_3847_1538_4357_ac82b9
crossref_primary_10_1088_1742_6596_2439_1_012006
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Snippet Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of...
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StartPage 2
SubjectTerms Astrophysics
Atmosphere
Atomic spectroscopy
Emission
Energetic particles
Line spectra
Magnetic fields
Magnetic stars
Magnetospheres
Plasma astrophysics
Spectral line identification
Spectral line lists
Spectropolarimetry
Stars
Stellar atmospheres
Stellar magnetic fields
Title Direct Observation of the Radial Magnetic Field Gradient in HD 58260 from Spectropolarimetry of NLTE Lines in Emission
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https://www.proquest.com/docview/2622624721
Volume 925
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