Photometric Variability In A Warm, Strongly Magnetic Dq White Dwarf, SDSS J103655.39+652252.2

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dc.contributor.utaustinauthorWinget, D. E.en_US
dc.contributor.utaustinauthorMontgomery, Michael H.en_US
dc.contributor.utaustinauthorHermes, J. J.en_US
dc.contributor.utaustinauthorFalcon, Ross E.en_US
dc.contributor.utaustinauthorWinget, K. I.en_US
dc.creatorWilliams, Kurtis A.en_US
dc.creatorWinget, D. E.en_US
dc.creatorMontgomery, Michael H.en_US
dc.creatorDufour, Patricken_US
dc.creatorKepler, S. O.en_US
dc.creatorHermes, J. J.en_US
dc.creatorFalcon, Ross E.en_US
dc.creatorWinget, K. I.en_US
dc.creatorBolte, Michaelen_US
dc.creatorRubin, Kate H. R.en_US
dc.creatorLiebert, Jamesen_US
dc.date.accessioned2016-04-28T19:33:43Z
dc.date.available2016-04-28T19:33:43Z
dc.date.issued2013-06en
dc.description.abstractWe present the discovery of photometric variability in the DQ white dwarf SDSS J103655.39+652252.2 (SDSS J1036+6522). Time-series photometry reveals a coherent monoperiodic modulation at a period of 1115.64751(67) s with an amplitude 0.442% +/- 0.024%; no other periodic modulations are observed with amplitudes greater than or similar to 0.13%. The period, amplitude, and phase of this modulation are constant within errors over 16 months. The spectrum of SDSS J1036+6522 shows magnetic splitting of carbon lines, and we use Paschen-Back formalism to develop a grid of model atmospheres for mixed carbon and helium atmospheres. Our models, while reliant on several simplistic assumptions, nevertheless match the major spectral and photometric properties of the star with a self-consistent set of parameters: T-eff approximate to 15,500 K, log g approximate to 9, log(C/He) = -1.0, and a mean magnetic field strength of 3.0 +/- 0.2 MG. The temperature and abundances strongly suggest that SDSS J1036+6522 is a transition object between the hot, carbon-dominated DQs and the cool, helium-dominated DQs. The variability of SDSS J1036+6522 has characteristics similar to those of the variable hot carbon-atmosphere white dwarfs (DQVs), however, its temperature is significantly cooler. The pulse profile of SDSS J1036+6522 is nearly sinusoidal, in contrast with the significantly asymmetric pulse shapes of the known magnetic DQVs. If the variability in SDSS J1036+6522 is due to the same mechanism as other DQVs, then the pulse shape is not a definitive diagnostic on the absence of a strong magnetic field in DQVs. It remains unclear whether the root cause of the variability in SDSS J1036+6522 and the other hot DQVs is the same.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNational Science Foundationen_US
dc.description.sponsorshipAST-0602288en_US
dc.description.sponsorshipNSF AST-0909107en_US
dc.description.sponsorshipNorman Hackerman Advanced Research Program 003658-0252-2009en_US
dc.identifierdoi:10.15781/T2HZ3H
dc.identifier.Filename2013_06_sdssj103655.pdfen_US
dc.identifier.citationWilliams, Kurtis A., Donald Earl Winget, Michael Houston Montgomery, Patrick Dufour, Souza Oliveira Kepler, James J. Hermes, Ross E. Falcon et al. "Photometric variability in a warm, strongly magnetic DQ white dwarf, SDSS J103655. 39+ 652252.2." The Astrophysical Journal, Vol. 769, No. 2 (Jun., 2013): 123.en_US
dc.identifier.doi10.1088/0004-637x/769/2/123en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34745
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_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: evolutionen_US
dc.subjectstars: individual (sdss j103655.39+652252.2)en_US
dc.subjectstars:en_US
dc.subjectmagnetic fielden_US
dc.subjectstars: oscillations (including pulsations)en_US
dc.subjectwhite dwarfsen_US
dc.subjectdigital sky surveyen_US
dc.subjectmetal abundance patternsen_US
dc.subjectzeeman-split linesen_US
dc.subjectapen_US
dc.subjectstarsen_US
dc.subjectatmospheric analysisen_US
dc.subjectdata releaseen_US
dc.subjectcluster m35en_US
dc.subjectdata-baseen_US
dc.subjecthoten_US
dc.subjectcarbonen_US
dc.subjectastronomy & astrophysicsen_US
dc.titlePhotometric Variability In A Warm, Strongly Magnetic Dq White Dwarf, SDSS J103655.39+652252.2en_US
dc.typeArticleen_US

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