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dc.contributor.authorCatalan, S.
dc.contributor.authorTremblay, P. -E.
dc.contributor.authorPinfield, D.J.
dc.contributor.authorSmith, Leigh
dc.contributor.authorZhang, Z. H.
dc.contributor.authorNapiwotzki, R.
dc.contributor.authorMarocco, F.
dc.contributor.authorDay-Jones, A. C.
dc.contributor.authorGomes, J.
dc.contributor.authorForde, K.P.
dc.contributor.authorLucas, P.W.
dc.contributor.authorJones, H.R.A.
dc.date.accessioned2014-07-15T09:30:10Z
dc.date.available2014-07-15T09:30:10Z
dc.date.issued2012-10
dc.identifier.citationCatalan , S , Tremblay , P -E , Pinfield , D J , Smith , L , Zhang , Z H , Napiwotzki , R , Marocco , F , Day-Jones , A C , Gomes , J , Forde , K P , Lucas , P W & Jones , H R A 2012 , ' The brightest pure-H ultracool white dwarf ' , Astronomy & Astrophysics , vol. 546 , 3 . https://doi.org/10.1051/0004-6361/201220191
dc.identifier.issn0004-6361
dc.identifier.otherORCID: /0000-0002-8872-4462/work/62748831
dc.identifier.urihttp://hdl.handle.net/2299/13936
dc.description.abstractWe report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo population. LSR J0745+2627 has a high proper motion (890 mas/yr) and a high reduced proper motion value in the J band (H-J = 21.87). We show how the infrared-reduced proper motion diagram is useful for selecting a sample of cool white dwarfs with low contamination. LSR J0745+2627 is also detected in the Sloan Digital Sky Survey (SDSS) and the Wide-field Infrared Survey Explorer (WISE). We have spectroscopically confirmed this object as a cool white dwarf using X-Shooter on the Very Large Telescope. A detailed analysis of its spectral energy distribution reveals that its atmosphere is compatible with a pure-H composition model with an effective temperature of 3880 +/- 90 K. This object is the brightest pure-H ultracool white dwarf (T-eff <4000 K) ever identified. We have constrained the distance (24-45 pc), space velocities and age considering different surface gravities. The results obtained suggest that LSR J0745+2627 belongs to the thick-disk/halo population and is also one of the closest ultracool white dwarfs.en
dc.format.extent5
dc.format.extent558086
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.subjectwhite dwarfs
dc.subjectstars: Population II
dc.subjectstars: abundances
dc.subjectstars: individual: ULAS J074509.02+262705.0
dc.subjectstars: individual: SDSS J074509.02+262705.0
dc.subjectstars: fundamental parameters
dc.subjectDIGITAL-SKY-SURVEY
dc.subjectMODEL ATMOSPHERE ANALYSIS
dc.subjectLUMINOSITY FUNCTION
dc.subjectPHOTOMETRIC SYSTEM
dc.subjectSOLAR NEIGHBORHOOD
dc.subjectNORTHERN STARS
dc.subject3D KINEMATICS
dc.subjectSPY PROJECT
dc.subjectCATALOG
dc.titleThe brightest pure-H ultracool white dwarfen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecord10.1051/0004-6361/201220191
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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