Evidence of enhanced magnetism in cool, polluted white dwarfs
We report the discovery of a new, polluted, magnetic white dwarf in the Luyten survey of high-proper motion stars. High-dispersion spectra of NLTT 7547 reveal a complex heavy element line spectrum in a cool (≈5200 K) hydrogen-dominated atmosphere showing the effect of a surface averaged field of 163...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2019
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1093/mnras/sty3048 http://hdl.handle.net/20.500.11937/80398 |
| _version_ | 1848764210947817472 |
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| author | Kawka, Adela Vennes, S. Ferrario, L. Paunzen, E. |
| author_facet | Kawka, Adela Vennes, S. Ferrario, L. Paunzen, E. |
| author_sort | Kawka, Adela |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report the discovery of a new, polluted, magnetic white dwarf in the Luyten survey of high-proper motion stars. High-dispersion spectra of NLTT 7547 reveal a complex heavy element line spectrum in a cool (≈5200 K) hydrogen-dominated atmosphere showing the effect of a surface averaged field of 163 kG, consistent with a 240 kG centred dipole, although the actual field structure remains uncertain. The abundance pattern shows the effect of accreted material with a distinct magnesium-rich flavour. Combined with earlier identifications, this discovery supports a correlation between the incidence of magnetism in cool white dwarfs and their contamination by heavy elements. |
| first_indexed | 2025-11-14T11:15:45Z |
| format | Journal Article |
| id | curtin-20.500.11937-80398 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:15:45Z |
| publishDate | 2019 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-803982020-09-04T04:13:41Z Evidence of enhanced magnetism in cool, polluted white dwarfs Kawka, Adela Vennes, S. Ferrario, L. Paunzen, E. Science & Technology Physical Sciences Astronomy & Astrophysics stars: abundances stars: individual: NLTT 7547 stars: magnetic field white dwarfs CARBON-DOMINATED ATMOSPHERE DIATOMIC-MOLECULES PLANETARY SYSTEMS FIELD STARS HOT DISTRIBUTIONS PHOTOMETRY CONVECTION KINEMATICS We report the discovery of a new, polluted, magnetic white dwarf in the Luyten survey of high-proper motion stars. High-dispersion spectra of NLTT 7547 reveal a complex heavy element line spectrum in a cool (≈5200 K) hydrogen-dominated atmosphere showing the effect of a surface averaged field of 163 kG, consistent with a 240 kG centred dipole, although the actual field structure remains uncertain. The abundance pattern shows the effect of accreted material with a distinct magnesium-rich flavour. Combined with earlier identifications, this discovery supports a correlation between the incidence of magnetism in cool white dwarfs and their contamination by heavy elements. 2019 Journal Article http://hdl.handle.net/20.500.11937/80398 10.1093/mnras/sty3048 English http://dx.doi.org/10.1093/mnras/sty3048 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics stars: abundances stars: individual: NLTT 7547 stars: magnetic field white dwarfs CARBON-DOMINATED ATMOSPHERE DIATOMIC-MOLECULES PLANETARY SYSTEMS FIELD STARS HOT DISTRIBUTIONS PHOTOMETRY CONVECTION KINEMATICS Kawka, Adela Vennes, S. Ferrario, L. Paunzen, E. Evidence of enhanced magnetism in cool, polluted white dwarfs |
| title | Evidence of enhanced magnetism in cool, polluted white dwarfs |
| title_full | Evidence of enhanced magnetism in cool, polluted white dwarfs |
| title_fullStr | Evidence of enhanced magnetism in cool, polluted white dwarfs |
| title_full_unstemmed | Evidence of enhanced magnetism in cool, polluted white dwarfs |
| title_short | Evidence of enhanced magnetism in cool, polluted white dwarfs |
| title_sort | evidence of enhanced magnetism in cool, polluted white dwarfs |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics stars: abundances stars: individual: NLTT 7547 stars: magnetic field white dwarfs CARBON-DOMINATED ATMOSPHERE DIATOMIC-MOLECULES PLANETARY SYSTEMS FIELD STARS HOT DISTRIBUTIONS PHOTOMETRY CONVECTION KINEMATICS |
| url | http://dx.doi.org/10.1093/mnras/sty3048 http://hdl.handle.net/20.500.11937/80398 |