The Library
Analysis of hydrogen-rich magnetic white dwarfs detected in the Sloan Digital Sky Survey
Tools
Külebi, B., Jordan, S. (Stefan), Euchner, F., Gänsicke, B. T. (Boris T.) and Hirsch, H. (Heiko) (2009) Analysis of hydrogen-rich magnetic white dwarfs detected in the Sloan Digital Sky Survey. Astronomy & Astrophysics, Vol.506 (No.3). pp. 1341-1350. doi:10.1051/0004-6361/200912570 ISSN 0004-6361.
PDF
WRAP_Gaensicke_14_analysis_hydrogen_rich_aa12570-09[1].pdf - Requires a PDF viewer. Download (4Mb) |
Official URL: http://dx.doi.org/10.1051/0004-6361/200912570
Abstract
Context
A large number of magnetic white dwarfs discovered in the SDSS have so far only been analyzed by visual comparison of the observations with relatively simple models of the radiation transport in a magnetised stellar atmosphere.
Aims We model the structure of the surface magnetic fields of the hydrogen-rich white dwarfs in the SDSS.
Methods
We calculated a grid of state-of-the-art theoretical optical spectra of hydrogen-rich magnetic white dwarfs (WDs) with magnetic field strengths of between 1 MG and 1200 MG for different angles between the magnetic field vector and the line of sight,and for effective temperatures between 7000 K and 50 000 K. We used a least squares minimization scheme with an evolutionary algorithm to find the best-fit magnetic field geometry of the observed data. We used centered dipoles or dipoles that had been shifted
along the dipole axis to model the coadded SDSS fiber spectrum of each object.
Result
We analyzed the spectra of all known magnetic hydrogen-rich (DA) WDs from the SDSS (97 previously published, plus 44 newly discovered) and also investigated the statistical properties of the magnetic field geometries of this sample.
Conclusions
The total number of known magnetic white dwarfs has already been more than tripled by the SDSS and more objects are expected after more systematic searches. The magnetic fields have strengths of between ≈1 and 900 MG. Our results further support the claims that Ap/Bp population is insufficient in generating the numbers and field strength distributions of the observed MWDs, and that of either another source of progenitor types or binary evolution is needed. Clear indications of non-centered dipoles exist in about ∼50%, of the objects which is consistent with the magnetic field distribution observed in Ap/Bp stars.
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year