About: The 1.17 Day Orbit of the Double-degenerate (DA+DQ) NLTT 16249

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	New spectroscopic observations show that the double-degenerate system NLTT 16249 is in a close orbit (a = 5.6 +/- 0.3 R-circle dot) with a period of 1.17 days. The total mass of the system is estimated between 1.47 and 2.04 M-circle dot but it is not expected to merge within a Hubble timescale (t(merge) approximate to 10(11) yr). Vennes & Kawka originally identified the system because of the peculiar composite hydrogen (DA class) and molecular (C-2-DQ class and CN) spectra and the new observations establish this system as the first DA plus DQ close double degenerate. Also, the DQ component was the first of its class to show nitrogen dredged up from the core in its atmosphere. The star may be viewed as the first known DQ descendant of the born-again PG1159 stars. Alternatively, the presence of nitrogen may be the result of past interactions and truncated evolution in a close binary system. New spectroscopic observations show that the double-degenerate system NLTT 16249 is in a close orbit (a = 5.6 +/- 0.3 R-circle dot) with a period of 1.17 days. The total mass of the system is estimated between 1.47 and 2.04 M-circle dot but it is not expected to merge within a Hubble timescale (t(merge) approximate to 10(11) yr). Vennes & Kawka originally identified the system because of the peculiar composite hydrogen (DA class) and molecular (C-2-DQ class and CN) spectra and the new observations establish this system as the first DA plus DQ close double degenerate. Also, the DQ component was the first of its class to show nitrogen dredged up from the core in its atmosphere. The star may be viewed as the first known DQ descendant of the born-again PG1159 stars. Alternatively, the presence of nitrogen may be the result of past interactions and truncated evolution in a close binary system. (en)
Title	The 1.17 Day Orbit of the Double-degenerate (DA+DQ) NLTT 16249 The 1.17 Day Orbit of the Double-degenerate (DA+DQ) NLTT 16249 (en)
skos:prefLabel	The 1.17 Day Orbit of the Double-degenerate (DA+DQ) NLTT 16249 The 1.17 Day Orbit of the Double-degenerate (DA+DQ) NLTT 16249 (en)
skos:notation	RIV/67985815:_____/12:00388495!RIV13-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(GAP209/10/0967)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2013
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	183257
http://linked.open...ai/riv/idVysledku	RIV/67985815:_____/12:00388495
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	close binaries; white dwarfs; fundamental parameters (en)
http://linked.open.../riv/klicoveSlovo	white dwarfs fundamental parameters close binaries
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[71180199A2AE]
http://linked.open...i/riv/nazevZdroje	Astrophysical Journal Letters
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Properties of the white dwarf population and their planetary connection
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	756
http://linked.open...iv/tvurceVysledku	Kawka, Adela Vennes, Stephane Thorstensen, J. R. O'Toole, S. J.
http://linked.open...ain/vavai/riv/wos	000308074800005
issn	2041-8205
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/2041-8205/756/1/L5
is http://linked.open...avai/riv/vysledek of	The 1.17 Day Orbit of the Double-degenerate (DA+DQ) NLTT 16249

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