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2006 WHOLE EARTH TELESCOPE OBSERVATIONS OF GD358: A NEW LOOK AT THE PROTOTYPE DBV
Provencal, J. L.,Montgomery, M. H.,Kanaan, A.,Shipman, H. L.,Childers, D.,Baran, A.,Kepler, S. O.,Reed, M.,Zhou, A.,Eggen, J.,Watson, T. K.,Winget, D. E.,Thompson, S. E.,Riaz, B.,Nitta, A.,Kleinman, S IOP Publishing 2009 The Astrophysical journal Vol.693 No.1
Redaelli, M.,Kepler, S. O.,Costa, J. E. S.,Winget, D. E.,Handler, G.,Castanheira, B. G.,Kanaan, A.,Fraga, L.,Henrique, P.,Giovannini, O.,Provencal, J. L.,Shipman, H. L.,Dalessio, J.,Thompson, S. E.,Mu Blackwell Publishing Ltd 2011 Monthly notices of the Royal Astronomical Society Vol.415 No.2
<P><B>ABSTRACT</B></P><P>PG 1351+489 is one of the 20 DBVs – pulsating helium‐atmosphere white dwarf stars – known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate period determinations for the main peak at 489.334 48 s and two other normal modes using data from the Whole Earth Telescope (WET) observations of 1995 and 2009. In 2009, we detected a new pulsation mode and the main pulsation mode exhibited substantial change in its amplitude compared to all previous observations. We were able to estimate the star's rotation period, of 8.9 h, and discuss a possible determination of the rate of period change of (2.0 ± 0.9) × 10<SUP>−13</SUP> s s <SUP>−1</SUP>, the first such estimate for a DBV.</P>
The pulsation modes of the pre-white dwarf PG 1159-035
Costa, J. E. S.,Kepler, S. O.,Winget, D. E.,O'Brien, M. S.,Kawaler, S. D.,Costa, A. F. M.,Giovannini, O.,Kanaan, A.,Mukadam, A. S.,Mullally, F.,Nitta, A.,Provenç,al, J. L.,Shipman, H.,Wood, M. A EDP Sciences 2008 Astronomy and astrophysics Vol.477 No.2
Provencal, J. L.,Montgomery, M. H.,Kanaan, A.,Thompson, S. E.,Dalessio, J.,Shipman, H. L.,Childers, D.,Clemens, J. C.,Rosen, R.,Henrique, P.,Bischoff-Kim, A.,Strickland, W.,Chandler, D.,Walter, B.,Wat IOP Publishing 2012 The Astrophysical journal Vol.751 No.2
<P>We report on an analysis of 308.3 hr of high-speed photometry targeting the pulsating DA white dwarf EC14012-1446. The data were acquired with the Whole Earth Telescope during the 2008 international observing run XCOV26. The Fourier transform of the light curve contains 19 independent frequencies and numerous combination frequencies. The dominant peaks are 1633.907, 1887.404, and 2504.897 mu Hz. Our analysis of the combination amplitudes reveals that the parent frequencies are consistent with modes of spherical degree l = 1. The combination amplitudes also provide m identifications for the largest amplitude parent frequencies. Our seismology analysis, which includes 2004-2007 archival data, confirms these identifications, provides constraints on additional frequencies, and finds an average period spacing of 41 s. Building on this foundation, we present nonlinear fits to high signal-to-noise light curves from the SOAR 4.1 m, McDonald 2.1 m, and KPNO 2 m telescopes. The fits indicate a time-averaged convective response timescale of tau(0) = 99.4 +/- 17 s, a temperature exponent N = 85 +/- 6.2, and an inclination angle of theta(i) = 32 degrees.9 +/- 3 degrees.2. We present our current empirical map of the convective response timescale across the DA instability strip.</P>
Data processing pipeline for <i>Herschel </i>HIFI
Shipman, R. F.,Beaulieu, S. F.,Teyssier, D.,Morris, P.,Rengel, M.,McCoey, C.,Edwards, K.,Kester, D.,Lorenzani, A.,Coeur-Joly, O.,Melchior, M.,Xie, J.,Sanchez, E.,Zaal, P.,Avruch, I.,Borys, C.,Braine, Springer-Verlag 2017 Astronomy and astrophysics Vol.608 No.-