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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Multi-site observations of pulsation in the accreting white dwarf SDSSJ161033.64-010223.3 (V386 Ser)
Astrophysical Journal, Volume 714, No. 2, Year 2010
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Description
Non-radial pulsations in the primary white dwarfs of cataclysmic variables can now potentially allow us to explore the stellar interior of these accretors using stellar seismology. In this context, we conducted a multi-site campaign on the accreting pulsator SDSSJ161033.64-010223.3 (V386 Ser) using seven observatories located around the world in 2007 May over a duration of 11 days. We report the best-fit periodicities here, which were also previously observed in 2004, suggesting their underlying stability. Although we did not uncover a sufficient number of independent pulsation modes for a unique seismological fit, our campaign revealed that the dominant pulsation mode at 609s is an evenly spaced triplet. The even nature of the triplet is suggestive of rotational splitting, implying an enigmatic rotation period of about 4.8 days. There are two viable alternatives assuming the triplet is real: either the period of 4.8 days is representative of the rotation period of the entire star with implications for the angular momentum evolution of these systems, or it is perhaps an indication of differential rotation with a fast rotating exterior and slow rotation deeper in the star. Investigating the possibility that a changing period could mimic a triplet suggests that this scenario is improbable, but not impossible. Using time-series spectra acquired in 2009 May, we determine the orbital period of SDSSJ161033.64-010223.3 to be 83.82.9minutes. Three of the observed photometric frequencies from our 2007 May campaign appear to be linear combinations of the 609s pulsation mode with the first harmonic of the orbital period at 41.5minutes. This is the first discovery of a linear combination between non-radial pulsation and orbital motion for a variable white dwarf. © 2010 The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Mukadam, Anjum S.
United States, Seattle
University of Washington
United States, Sunspot
Apache Point Observatory
Townsley, Dean M.
United States, Tucson
The University of Arizona
Gänsicke, Boris T.
United Kingdom, Coventry
University of Warwick
Szkody, Paula
United States, Seattle
University of Washington
United States, Sunspot
Apache Point Observatory
Marsh, Thomas R.
United Kingdom, Coventry
University of Warwick
Robinson, Edward L.
United States, Austin
The University of Texas at Austin
Bildsten, Lars
United States, Santa Barbara
Kavli Institute for Theoretical Physics
United States, Santa Barbara
University of California, Santa Barbara
Aungwerojwit, A.
United Kingdom, Coventry
University of Warwick
Thailand, Pitsanulok
Naresuan University
Schreiber, Matthias R.
Chile, Valparaiso
Universidad de Valparaiso
Southworth, John K.
United Kingdom, Coventry
University of Warwick
Schwope, Axel D.
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
For, Biqing
United States, Austin
The University of Texas at Austin
Tovmassian, G.
Mexico, Mexico
Universidad Nacional Autónoma de México
Zharikov, Sergey V.
Mexico, Mexico
Universidad Nacional Autónoma de México
Hidas, M. G.
United States, Santa Barbara
University of California, Santa Barbara
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
Australia, Sydney
The University of Sydney
Baliber, N.
United States, Santa Barbara
University of California, Santa Barbara
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
Brown, Timothy M.
United States, Santa Barbara
University of California, Santa Barbara
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
Woudt, P. A.
South Africa, Cape Town
University of Cape Town
Warner, Brian P.
South Africa, Cape Town
University of Cape Town
O'Donoghue, Darragh E.
South Africa, Cape Town
South African Astronomical Observatory
Buckley, David A.H.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope Foundation
Sefako, Ramotholo R.
South Africa, Cape Town
South African Astronomical Observatory
Sión, Edward M.
United States, Villanova
Villanova University
Statistics
Citations: 23
Authors: 23
Affiliations: 17
Identifiers
Doi:
10.1088/0004-637X/714/2/1702
ISSN:
0004637X
e-ISSN:
15384357