SDSS J142625.71+575218.3: the First Pulsating White Dwarf With A Large Detectable Magnetic Field

dc.contributor.utaustinauthorWilliams, K.en_US
dc.creatorDufour, P.en_US
dc.creatorFontaine, G.en_US
dc.creatorLiebert, J.en_US
dc.creatorWilliams, K.en_US
dc.creatorLai, D. K.en_US
dc.date.accessioned2016-10-28T19:35:46Z
dc.date.available2016-10-28T19:35:46Z
dc.date.issued2008-08en_US
dc.description.abstractWe report the discovery of a strong magnetic field in the unique pulsating carbon- atmosphere white dwarf SDSS J142625.71 + 575218.3. From spectra gathered at the MMT and Keck telescopes, we infer a surface field of B(s) similar or equal to 1.2 MG, based on obvious Zeeman components seen in several carbon lines. We also detect the presence of a Zeeman- splitted He I lambda 4471 line, which is an indicator of the presence of a nonnegligible amount of helium in the atmosphere of this "hot DQ" star. This is important for understanding its pulsations, as nonadabatic theory reveals that some helium must be present in the envelope mixture for pulsation modes to be excited in the range of effective temperature where the target star is found. Out of nearly 200 pulsating white dwarfs known today, this is the first example of a star with a large detectable magnetic field. We suggest that SDSS J142625.71 + 575218.3 is the white dwarf equivalent of a rapidly oscillating Ap star.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNSERCen_US
dc.description.sponsorshipNSF AST 03-07321en_US
dc.description.sponsorshipReardon Foundationen_US
dc.identifierdoi:10.15781/T25X25G20
dc.identifier.citationDufour, P., G. Fontaine, James Liebert, Kurtis Williams, and David K. Lai. "SDSS J142625. 71+ 575218.3: the first pulsating white dwarf with a large detectable magnetic field." The Astrophysical Journal Letters, Vol. 683, No. 2 (Aug., 2008): L167.en_US
dc.identifier.doi10.1086/591672en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/42989
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectstars : abundancesen_US
dc.subjectstars : atmospheresen_US
dc.subjectstars : individual (sdssen_US
dc.subjectj1426+5752)en_US
dc.subjectstars : magnetic fieldsen_US
dc.subjectdynamo generationen_US
dc.subjectfeige-7en_US
dc.subjectgd-358en_US
dc.subjectstarsen_US
dc.subjectrichen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleSDSS J142625.71+575218.3: the First Pulsating White Dwarf With A Large Detectable Magnetic Fielden_US
dc.typeArticleen_US

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