Spectroscopic analysis of DA white dwarfs from the McCook & Sion catalog

Abstract

For some years now, we have been gathering optical spectra of DA white dwarfs in an effort to study and define the empirical ZZ Ceti instability strip. However, we have recently expanded this survey to include all the DA white dwarfs in the McCook & Sion catalog down to a limiting visual magnitude of V=17.5. We present here a spectroscopic analysis of over 1000 DA white dwarfs from this ongoing survey. We have several specific areas of interest most notably the hot DAO white dwarfs, the ZZ Ceti instability strip, and the DA+dM binary systems. Furthermore, we present a comparison of the ensemble properties of our sample with those of other large surveys of DA white dwarfs, paying particular attention to the distribution of mass as a function of effective temperature.

arXiv comment8 pages, 7 figures, to appear in Journal of Physics Conference Proceedings for the 16th European White Dwarf Workshop

References in corpus (4)

• The Formation Rate, Mass and Luminosity Functions of DA White Dwarfs from the Palomar Green Survey
• A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• Low-Mass Dwarf Template Spectra from the Sloan Digital Sky Survey
• Towards an Empirical Determination of the ZZ Ceti Instability Strip

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• New Insights into the Problem of the Surface Gravity Distribution of Cool DA White Dwarfs
• Solution to the problem of the surface gravity distribution of cool DA white dwarfs from improved 3D model atmospheres
• Two new young, wide magnetic + non-magnetic double-degenerate binary systems