About: The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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 Iλ4226) 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 similar parameters 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, imply similar 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. 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 Iλ4226) 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 similar parameters 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, imply similar 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. (en)
Title	The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments (en)
skos:prefLabel	The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments The Polluted Atmosphere of the White Dwarf NLTT 25792 and the Diversity of Circumstellar Environments (en)
skos:notation	RIV/67985815:_____/13:00399742!RIV14-GA0-67985815
http://linked.open...avai/predkladatel	Astronomický ústav AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA13-14581S), P(GAP209/12/0217)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Kawka, Adela Vennes, Stephane
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Astronomický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	97005
http://linked.open...ai/riv/idVysledku	RIV/67985815:_____/13:00399742
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	stars; abundances; atmospheres (en)
http://linked.open.../riv/klicoveSlovo	abundances atmospheres stars
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[6FB48315FF2F]
http://linked.open...i/riv/nazevZdroje	Astrophysical Journal
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Multispectral variability of hot stars and its nature Population density and kinematics of white dwarfs in the Galactic halo and disc
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	779
http://linked.open...iv/tvurceVysledku	Kawka, Adela Vennes, Stephane
http://linked.open...ain/vavai/riv/wos	000328160100070
issn	0004-637X
number of pages	10 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/0004-637X/779/1/70

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