A New ZZ Ceti White Dwarf Pulsator: G30-20

dc.contributor.utaustinauthorMukadam, Anjum S.en_US
dc.contributor.utaustinauthorWinget, D. E.en_US
dc.creatorMukadam, Anjum S.en_US
dc.creatorKepler, S. O.en_US
dc.creatorWinget, D. E.en_US
dc.creatorBergeron, P.en_US
dc.date.accessioned2016-04-28T19:34:37Z
dc.date.available2016-04-28T19:34:37Z
dc.date.issued2002-11en
dc.description.abstractWe report the discovery of a new hydrogen atmosphere variable white dwarf (DAV; ZZ Ceti), G30-20, a high-amplitude, long-period pulsator. The Fourier transform of its light curve shows power around 1050-1125 s. We suspect the existence of multiple periodicities in this region, probably corresponding to different radial order (k) modes, but our observations are not long enough to resolve them. This discovery increases the number of known DAVs to 32. Our best fit to its optical spectrum gives T-eff = 11; 070 +/- 180 K and log g = 7.95 +/- 0.06. This implies that G30-20 is the coolest known DAV.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNSF AST-9876730en_US
dc.description.sponsorshipNASA NAG 5-9321en_US
dc.description.sponsorshipSTSI GO-08254en_US
dc.identifierdoi:10.15781/T2FV47
dc.identifier.Filename2002_11_zzceti.pdfen_US
dc.identifier.citationMukadam, Anjum S., Souza Oliveira Kepler, Donald Earl Winget, and Pierre Bergeron. "A new ZZ Ceti white dwarf pulsator: G30-20." The Astrophysical Journal, Vol. 580, No. 1 (Nov., 2002): 429.en_US
dc.identifier.doi10.1086/343085en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34792
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 (g30-20, wd2347+128)en_US
dc.subjectstars : oscillationsen_US
dc.subjectstars :en_US
dc.subjectvariables : otheren_US
dc.subjectwhite dwarfsen_US
dc.subjectevolutionary time scaleen_US
dc.subjectwhole earth telescopeen_US
dc.subjectgravity modesen_US
dc.subjectstarsen_US
dc.subjectdaen_US
dc.subjectspectrophotometryen_US
dc.subjectinstabilityen_US
dc.subjectg117-b15aen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleA New ZZ Ceti White Dwarf Pulsator: G30-20en_US
dc.typeArticleen_US

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