Eleven more new DAVs from the Sloan Survey

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Eleven more new DAVs from the Sloan Survey

• Fergal Mullally1 (fergal_at_astro.as.utexas.edu),
  Barbara Castanheira2, Susan E. Thompson3,
• Daniel Eisenstein4, Scot Kleinman4, Atuko Nitta4,
  D. E. Winget1 and the Sloan collaboration
• 1. McDonald Observatory and Dept. Astronomy,
  University of Texas at Austin, USA.
• 2. Instituto de Física, Universidade Federal do
  Rio Grande do Sul, Brazil
• 3. UNC-Chapel Hill, USA.
• 4. New Mexico State University, Apache Point
  Observatory, New Mexico, USA.

We present eleven new hydrogen atmosphere
pulsating white dwarf stars (DAVs) discovered
from the Sloan survey. Candidate pulsators were
initally selected on the basis of their
photometric colours, and the list was further
refined fitting the stellar temperature and
gravity to models by Finley, Koester, Basri
(1997) using the technique described in Kleinmann
et al (2004). Candidates are then observed with
the 2.1m Otto Struve telescope at McDonald
Observatory using the Argos CCD photometer
(Nather Mukadam 2004). We are continuing the
survey of Mukadam et al. (2004) and have
increased the sample of DAVs to 82. We continue
to find their comparatively narrow instability
strip.
This work is funded by NASA Origins grant
NAG-5-13094. We acknowledge the support of
CAPES/UT and CNPq Funding for the creation and
distribution of the SDSS Archive has been
provided by the Alfred P. Sloan Foundation, the
Participating Institutions, the National
Aeronautics and Space Administration, the
National Science Foundation, the U.S. Department
of Energy, the Japanese Monbukagakusho, and the
Max Planck Society. The SDSS Web site is
http//www.sdss.org .
References Bergeron et al. 2004, ApJ, 600,
404 Finley, D. S., Koester, D., Basri, G. 1997,
ApJ, 488, 375 Kleinman et al. 2004, ApJ, 607,
426 Nather Mukadam 2004, ApJ, 605, 846 Mukadam
et al. 2004, ApJ, 607, 982