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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Pulsational mapping of calcium across the surface of a white dwarf
Astrophysical Journal, Volume 714, No. 1, Year 2010
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Description
We constrain the distribution of calcium across the surface of the white dwarf star G29-38 by combining time-series spectroscopy from Gemini-North with global time-series photometry from the Whole Earth Telescope. G29-38 is actively accreting metals from a known debris disk. Since the metals sink significantly faster than they mix across the surface, any inhomogeneity in the accretion process will appear as an inhomogeneity of the metals on the surface of the star. We measure the flux amplitudes and the calcium equivalent width amplitudes for two large pulsations excited on G29-38 in 2008. The ratio of these amplitudes best fits a model for polar accretion of calcium and rules out equatorial accretion. © 2010 The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Thompson, Susan E.
United States, Newark
University of Delaware
United States, Greenville
Mt. Cuba Observatory
Montgomery, Michael H.
United States, Greenville
Mt. Cuba Observatory
United States, Austin
The University of Texas at Austin
von Hippel, Ted
United States, Austin
The University of Texas at Austin
United States, Loudonville
Siena College
Nitta, Atsuko
United States, Hilo
Gemini Observatory
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Dalessio, James
United States, Newark
University of Delaware
United States, Greenville
Mt. Cuba Observatory
Provençal, Judith L.
United States, Newark
University of Delaware
United States, Greenville
Mt. Cuba Observatory
Strickland, W.
Unknown Affiliation
Holtzman, Jon A.
United States, Las Cruces
New Mexico State University
Mukadam, Anjum S.
United States, Seattle
University of Washington
Sullivan, Denis J.
New Zealand, Wellington
Victoria University of Wellington
Nagel, Thorsten
New Zealand, Wellington
Victoria University of Wellington
Koziel-Wierzbowska, Dorota
Poland, Krakow
Uniwersytet Jagielloński
Kundera, Tomasz
Poland, Krakow
Uniwersytet Jagielloński
Zoła, Stanisław
Poland, Krakow
Uniwersytet Jagielloński
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Winiarski, Maciej
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Drozdz, Marek
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Ogłoza, W.
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Bognár, Zs
Hungary, Budapest
Konkoly Observatory
Handler, Gerald
Austria, Vienna
Universität Wien
Kanaan, Antonio
Brazil, Florianopolis
Universidade Federal de Santa Catarina
Rosen, Rachel
United States, Charlottesville
National Radio Astronomy Observatory
Reichart, Daniel E.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Haislip, Joshua B.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Barlow, Brad N.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Dunlap, Bart H.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Ivarsen, Kevin M.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
LaCluyzé, Aaron P.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Mullally, Fergal R.
United States, Princeton
Princeton University
Statistics
Citations: 11
Authors: 28
Affiliations: 17
Identifiers
Doi:
10.1088/0004-637X/714/1/296
ISSN:
0004637X