Thirty-Five New Pulsating DA White Dwarf Stars

Anjum S. Mukadam; F. Mullally; R. E. Nather; D. E. Winget; Ted von Hippel; S. J. Kleinman; Atsuko Nitta; Jurek Krzesiński; S. O. Kepler; A. Kanaan; D. Koester; D. J. Sullivan; D. Homeier; S. E. Thompson; D. Reaves; C. Cotter; D. Slaughter; J. Brinkmann

doi:10.1086/383083

Thirty-Five New Pulsating DA White Dwarf Stars

Anjum S. Mukadam^1,2, F. Mullally^1,2, R. E. Nather^1,2, D. E. Winget^1,2, Ted von Hippel^1,2, S. J. Kleinman³, Atsuko Nitta³, Jurek Krzesiński^3,4, S. O. Kepler⁵, A. Kanaan⁶, D. Koester⁷, D. J. Sullivan⁸, D. Homeier⁹, S. E. Thompson¹⁰, D. Reaves¹, C. Cotter¹, D. Slaughter¹, and J. Brinkmann³

© 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 607, Number 2 Citation Anjum S. Mukadam et al 2004 ApJ 607 982 DOI 10.1086/383083

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¹ Department of Astronomy, University of Texas at Austin, Austin, TX 78712

² McDonald Observatory, Fort Davis, TX 79734

³ Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349

⁴ Mount Suhora Observatory, Cracow Pedagogical University, ul. Podchorạżych 2, 30-084 Cracow, Poland

⁵ Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, RS, Brazil

⁶ Departamento de Física, Universidade Federal de Santa Catarina, 88040-900, Florianopolis, SC, Brazil

⁷ Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany

⁸ School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand

⁹ University of Georgia, Athens, GA 30602

¹⁰ Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599

Dates

Received 2003 November 7
Accepted 2004 January 21

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Abstract

We present 35 new pulsating DA (hydrogen atmosphere) white dwarf stars discovered from the Sloan Digital Sky Survey (SDSS) and the Hamburg Quasar Survey (HQS). We have acquired high-speed time series photometry of preselected DA white dwarfs with a prime focus CCD photometer on the 2.1 m telescope at McDonald Observatory over 15 months. We selected these stars on the basis of prior photometric and spectroscopic observations by the SDSS and HQS. For the homogeneous SDSS sample, we achieve a success rate of 80% for finding new variables at a detection threshold of 0.1%-0.3%. With 35 newly discovered DA variable white dwarfs, we almost double the current sample of 39.

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Thirty-Five New Pulsating DA White Dwarf Stars

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