uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A high-precision search for magnetic field oscillations in the roAp star HD 24712
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
2007 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 467, no 2, 679-683 p.Article in journal (Refereed) Published
Abstract [en]

We have obtained a time series of 81 high-cadence circular polarization observations of the rapidly oscillating Ap star HD24712 with the new ESPaDOnS spectropolarimeter at CFHT. We used the high-S/N, high-resolution Stokes / and V spectra to investigate possible variation of the mean longitudinal field over the pulsation cycle in this roAp star. Our multiline magnetic field and radial velocity measurements utilized 143 spectral lines of rare-earth elements, attaining precision better than 13Gand 19 ms-1, respectively. A multiperiodic radial velocity variation with an amplitude of 40-136 m s-1 is clearly detected at the known pulsation frequencies of HD 24712. At the same time, no evidence for pulsational changes of the magnetic field can be found. We derive a 3σ upper limit of 10 G, or about 1% of the mean longitudinal field strength, for magnetic field oscillations in the upper atmosphere of HD24712. The absence of detectable pulsational variability of the magnetic field provides a valuable constraint for the interaction between pulsations and magnetic field in roAp stars and is compatible with the recent predictions of detailed theoretical models of stellar magnetoacoustic oscillations.

Place, publisher, year, edition, pages
2007. Vol. 467, no 2, 679-683 p.
Keyword [en]
Stars: atmospheres; Stars: chemically peculiar; Stars: individual: HD 24712; Stars: magnetic fields; Stars: oscillations
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-14067DOI: 10.1051/0004-6361:20067025ISI: 000246424900031OAI: oai:DiVA.org:uu-14067DiVA: diva2:41837
Available from: 2008-01-28 Created: 2008-01-28 Last updated: 2017-12-11Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Kochukhov, Oleg

Search in DiVA

By author/editor
Kochukhov, Oleg
By organisation
Observational Astronomy
In the same journal
Astronomy and Astrophysics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 894 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf