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dc.contributor.authorCastanheira, Bárbara Garciapt_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.contributor.authorCosta, Alex Fabiano Murillo dapt_BR
dc.contributor.authorGiovannini Junior, Odilonpt_BR
dc.contributor.authorRobinson, E.L.pt_BR
dc.contributor.authorWinget, Donald Earlpt_BR
dc.contributor.authorKleinman, Scot Jamespt_BR
dc.contributor.authorNitta, Atsukopt_BR
dc.contributor.authorEisenstein, D.J.pt_BR
dc.contributor.authorKoester, Detlevpt_BR
dc.contributor.authorSantos, Marcio Gabriel dospt_BR
dc.date.accessioned2014-07-31T02:05:11Zpt_BR
dc.date.issued2007pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98982pt_BR
dc.description.abstractContext. We have observed again two stars inside the ZZ Ceti instability strip that were previously classified as not-observed-to-vary (NOV) by Mukadam et al. (2004) and found them to be low-amplitude variables. Some evidence points to a pure ZZ Ceti instability strip; other evidence contests it. Aims. The two stars previously classified as NOV have Sloan Digital Sky Survey (SDSS) spectroscopic effective temperatures that place them inside the ZZ Ceti instability strip, and they were “contaminating” the strip as constant stars, which could indicate that the instability strip was no longer a simple evolutionary stage. A pure instability strip indicates that pulsation is a normal phase which all DAs must go through. Methods. We used effective temperatures derived from SDSS optical spectra by comparing them with model atmospheres to look for pulsators through time-resolved photometry and stars previously classified as NOV. Results. Our new results indicate, but do not prove, a pure instability strip, because there are still other NOV stars that need to be observed again. Additionally, we have discovered five other ZZ Ceti stars based on their effective temperatures.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and astrophysics. Vol. 462, no. 3 (Feb. 2007), p. 989-993pt_BR
dc.rightsOpen Accessen
dc.subjectStars: white dwarfsen
dc.subjectAnãs brancaspt_BR
dc.subjectStars: variables: generalen
dc.subjectEstrelaspt_BR
dc.subjectOscilacoespt_BR
dc.subjectStars: oscillationsen
dc.titleTowards a pure ZZ Ceti instability strippt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000595607pt_BR
dc.type.originEstrangeiropt_BR


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