A New Timescale For Period Change In The Pulsating DA White Dwarf WD 0111+0018

dc.contributor.utaustinauthorHermes, J. J.en_US
dc.contributor.utaustinauthorMullally, Fergalen_US
dc.contributor.utaustinauthorWinget, D. E.en_US
dc.creatorHermes, J. J.en_US
dc.creatorMontgomery, Michael H.en_US
dc.creatorMullally, Fergalen_US
dc.creatorWinget, D. E.en_US
dc.creatorBischoff-Kim, Agnesen_US
dc.date.accessioned2016-04-28T19:34:40Z
dc.date.available2016-04-28T19:34:40Z
dc.date.issued2013-03en
dc.description.abstractWe report the most rapid rate of period change measured to date for a pulsating DA (hydrogen atmosphere) white dwarf (WD), observed in the 292.9 s mode of WD0111+0018. The observed period change, faster than 10(-12) s s(-1), exceeds by more than two orders of magnitude the expected rate from cooling alone for this class of slow and simply evolving pulsating WDs. This result indicates the presence of an additional timescale for period evolution in these pulsating objects. We also measure the rates of period change of nonlinear combination frequencies and show that they share the evolutionary characteristics of their parent modes, confirming that these combination frequencies are not independent modes but rather artifacts of some nonlinear distortion in the outer layers of the star.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipNorman Hackerman Advanced Research Program 003658-0255-2007, 003658-0252-2009en_US
dc.description.sponsorshipNASA Origins Program NAG5-13094en_US
dc.description.sponsorshipNational Science Foundation AST-0909107en_US
dc.identifierdoi:10.15781/T22N6H
dc.identifier.Filename2013_03_newtimescale.pdfen_US
dc.identifier.citationHermes, J. J., M. H. Montgomery, Fergal Mullally, D. E. Winget, and A. Bischoff-Kim. "A New Timescale for Period Change in the Pulsating DA White Dwarf WD 0111+ 0018." The Astrophysical Journal, Vol. 766, No. 1 (Mar., 2013): 42.en_US
dc.identifier.doi10.1088/0004-637x/766/1/42en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34795
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: individual (wd0111+0018)en_US
dc.subjectstars: oscillations (includingen_US
dc.subjectpulsations)en_US
dc.subjectstars: variables: generalen_US
dc.subjectwhite dwarfsen_US
dc.subjectceti instability stripen_US
dc.subjectwhole earth telescopeen_US
dc.subjectdigital sky surveyen_US
dc.subjectzz-cetien_US
dc.subjectempirical determinationen_US
dc.subjectstarsen_US
dc.subjectasteroseismologyen_US
dc.subjectg117-b15aen_US
dc.subjectevolutionaryen_US
dc.subjectconvectionen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleA New Timescale For Period Change In The Pulsating DA White Dwarf WD 0111+0018en_US
dc.typeArticleen_US

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