Show simple item record

dc.contributor.authorPreval, Simon P
dc.contributor.authorBarstow, Martin A
dc.contributor.authorBainbridge, Matthew
dc.contributor.authorReindl, Nicole
dc.contributor.authorAyres, Thomas
dc.contributor.authorHolberg, Jay B
dc.contributor.authorBarrow, John D
dc.contributor.authorLee, Chung-Chi
dc.contributor.authorWebb, John K
dc.contributor.authorHu, Jiting
dc.date.accessioned2019-09-05T00:41:47Z
dc.date.available2019-09-05T00:41:47Z
dc.date.issued2019-06-04
dc.identifier.citationSimon 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/stz1506en_US
dc.identifier.issn0035-8711
dc.identifier.doi10.1093/mnras/stz1506
dc.identifier.urihttp://hdl.handle.net/10150/634068
dc.description.abstractUsing 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.en_US
dc.description.sponsorshipLeverhulme Foundation; Royal. Commission 1851 Research Fellowship; NASA through Space Telescope Science Institute [NAS5-26555]; Science and Technology Facilities Council (STFC), UKen_US
dc.language.isoenen_US
dc.publisherOXFORD UNIV PRESSen_US
dc.rightsCopyright © 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)en_US
dc.subjectcircumstellar matteren_US
dc.subjectwhite dwarfsen_US
dc.subjectstars: individual: WD0455-282en_US
dc.subjectstars: individual: WD0621-376en_US
dc.subjectstars: individual: WD2211-495en_US
dc.titleA far-UV survey of three hot, metal-polluted white dwarf stars: WD0455−282, WD0621−376, and WD2211−495en_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben_US
dc.identifier.journalMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETYen_US
dc.description.collectioninformationThis 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.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume487
dc.source.issue3
dc.source.beginpage3470-3487
refterms.dateFOA2019-09-05T00:41:48Z


Files in this item

Thumbnail
Name:
stz1506.pdf
Size:
2.681Mb
Format:
PDF
Description:
Final Published Version

This item appears in the following Collection(s)

Show simple item record