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Title:
A search for p-mode pulsations in white dwarf stars using the Berkeley Visible Imaging Tube detector
Authors:
Kilkenny, D.; Welsh, B. Y.; Koen, C.; Gulbis, A. A. S.; Kotze, M. M.
Affiliation:
AA(Department of Physics, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa; ), AB(Experimental Astrophysics Group, Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA), AC(Department of Statistics, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa), AD(South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa), AE(South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 437, Issue 2, p.1836-1839 (MNRAS Homepage)
Publication Date:
01/2014
Origin:
OUP
Astronomy Keywords:
instrumentation: photometers, stars: individual: ZZ Ceti, stars: individual: HK Ceti, stars: individual: AF Pic, stars: individual: HP Lib, stars: individual: WD 1056-384
Abstract Copyright:
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stt2029
Bibliographic Code:
2014MNRAS.437.1836K

Abstract

We present high-speed photometry (resolution 0.1 s) obtained during the commissioning of the Berkely Visible Imaging Tube system on the Southern African Large Telescope (SALT). The observations were an attempt to search for very rapid p-mode oscillations in white dwarf stars and included three DA stars known to be g-mode pulsators (ZZ Cet, HK Cet and AF Pic), one other DA star (WD 1056-384) not known to be variable and one AM Cvn star (HP Lib). No evidence was found for any variations greater than about 1 mmag in amplitude (˜0.1 per cent) at frequencies in excess of 60 mHz (periods <17 s) in any of the target stars, though several previously known g-mode frequencies were recovered.
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