Search for p-mode Pulsations in DA White Dwarfs with VLT-ULTRACAM

Details Search for p-mode Pulsations in DA White Dwarfs with VLT-ULTRACAM Search for p-mode Pulsations in DA White Dwarfs with VLT-ULTRACAM

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372..593s&link_type=abstract

15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in

Astronomy and Astrophysics

Astronomy

6

Scientific paper

The goal of this project is to search for p-mode oscillations in a selected sample of DA white dwarfs near the blue edge of the ZZ Ceti instability strip, where the p-mode instability strip should be located following theoretical models. Our observations were performed using ULTRACAM, mounted at the visitor focus of the VLT, that can reach a speed up to 300 frames/sec in three photometric bands at the same time. Such high time resolution is required because the p-modes in white dwarfs are expected to have very short periods, of the order of tenths of seconds. In this article we present the preliminary results of our multi-band (SLOAN u',g',r') time-series photometry on nine targets and we briefly discuss the upper limits found on the amplitude of the p-modes.

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