The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F13%3A00399742" target="_blank" >RIV/67985815:_____/13:00399742 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1088/0004-637X/779/1/70" target="_blank" >http://dx.doi.org/10.1088/0004-637X/779/1/70</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/0004-637X/779/1/70" target="_blank" >10.1088/0004-637X/779/1/70</a>
Alternative languages
Result language
angličtina
Original language name
The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments
Original language description
We present an analysis of X-shooter spectra of the polluted, hydrogen-rich white dwarf NLTT 25792. The spectra show strong lines of calcium (Ca H&K, near-infrared calcium triplet, and Ca I?4226) and numerous lines of iron along with magnesium and aluminum lines from which we draw the abundance pattern. Moreover, the photospheric Ca H&K lines are possibly blended with a circumstellar component shifted by ?20 km s?1 relative to the photosphere. A comparison with a sample of four white dwarfs with similarparameters show considerable variations in their abundance patterns, particularly in the calcium to magnesium abundance ratio that varies by a factor of five within this sample. The observed variations, even after accounting for diffusion effects, implysimilar variations in the putative accretion source. Also, we find that silicon and sodium are significantly underabundant in the atmosphere of NLTT 25792, a fact that may offer some clues on the nature of the accretion source.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
0004-637X
e-ISSN
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Volume of the periodical
779
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
"70/1"-"70/10"
UT code for WoS article
000328160100070
EID of the result in the Scopus database
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