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    A far-UV survey of three hot, metal-polluted white dwarf stars: WD0455−282, WD0621−376, and WD2211−495

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    Author
    Preval, Simon P
    Barstow, Martin A
    Bainbridge, Matthew
    Reindl, Nicole
    Ayres, Thomas
    Holberg, Jay B
    Barrow, John D
    Lee, Chung-Chi
    Webb, John K
    Hu, Jiting
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-06-04
    Keywords
    circumstellar matter
    white dwarfs
    stars: individual: WD0455-282
    stars: individual: WD0621-376
    stars: individual: WD2211-495
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Simon P Preval, Martin A Barstow, Matthew Bainbridge, Nicole Reindl, Thomas Ayres, Jay B Holberg, John D Barrow, Chung-Chi Lee, John K Webb, Jiting Hu, A far-UV survey of three hot, metal-polluted white dwarf stars: WD0455−282, WD0621−376, and WD2211−495, Monthly Notices of the Royal Astronomical Society, Volume 487, Issue 3, August 2019, Pages 3470–3487, https://doi.org/10.1093/mnras/stz1506
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    Copyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Using newly obtained high-resolution data (R similar to 1 x 10(5)) from the Hubble Space Telescope, and archival UV data from the Far Ultraviolet Spectroscopic Explorer, we have conducted a detailed UV survey of the three hot, metal-polluted white dwarfs WD0455-282, WD0621-376, and WD2211-495. Using bespoke model atmospheres, we measured T-eff, log g, and photospheric abundances for these stars. In conjunction with data from Gaia, we measured masses, radii, and gravitational redshift velocities for our sample of objects. We compared the measured photospheric abundances with those predicted by radiative levitation theory, and found that the observed Si abundances in all three white dwarfs, and the observed Fe abundances in WD0621 - 376 and WD2211 -495, were larger than those predicted by an order of magnitude. These findings imply not only an external origin for the metals, but also ongoing accretion, as the metals not supported by radiative levitation would sink on extremely short time-scales. We measured the radial velocities of several absorption features along the line of sight to the three objects in our sample, allowing us to determine the velocities of the photospheric and interstellar components along the line of sight for each star, Interestingly, we made detections of circumstellar absorption along the line of sight to WD0455-282 with three velocity components. To our knowledge, this is the first such detection of multicomponent circumstellar absorption along the line of sight to a white dwarf.
    ISSN
    0035-8711
    DOI
    10.1093/mnras/stz1506
    Version
    Final published version
    Sponsors
    Leverhulme Foundation; Royal. Commission 1851 Research Fellowship; NASA through Space Telescope Science Institute [NAS5-26555]; Science and Technology Facilities Council (STFC), UK
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stz1506
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