Redefining the Empirical ZZ Ceti Instability Strip | Zendy

Anjum S. Mukadam | Zendy; D. E. Winget | Zendy; Ted von Hippel | Zendy; Μ. H. Montgomery | Zendy; S. O. Kepler | Zendy; A. F. M. Costa | Zendy

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Redefining the Empirical ZZ Ceti Instability Strip

Author(s) -

Anjum S. Mukadam,

D. E. Winget,

Ted von Hippel,

Μ. H. Montgomery,

S. O. Kepler,

A. F. M. Costa

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/422551

Subject(s) - instability strip , white dwarf , instability , sky , astrophysics , physics , stars , spectral line , homogeneous , homogeneity (statistics) , astronomy , mathematics , statistics , statistical physics , cepheid variable , mechanics

We use the new ZZ Ceti stars (hydrogen atmosphere white dwarf variables;DAVs) discovered within the Sloan Digital Sky Survey (Mukadam et al. 2004) tore-define the empirical ZZ Ceti instability strip. This is the first time sincethe discovery of white dwarf variables in 1968 that we have a homogeneous setof spectra acquired using the same instrument on the same telescope, and withconsistent data reductions, for a statistically significant sample of ZZ Cetistars. The homogeneity of the spectra reduces the scatter in the spectroscopictemperatures and we find a narrow instability strip of width ~950K, from10850--11800K. We question the purity of the DAV instability strip as we findseveral non-variables within. We present our best fit for the red edge and ourconstraint for the blue edge of the instability strip, determined using astatistical approach.Comment: 14 pages, 5 pages, ApJ paper, accepte

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