dc.contributor.author | Catalan, S. | |
dc.contributor.author | Tremblay, P. -E. | |
dc.contributor.author | Pinfield, D.J. | |
dc.contributor.author | Smith, Leigh | |
dc.contributor.author | Zhang, Z. H. | |
dc.contributor.author | Napiwotzki, R. | |
dc.contributor.author | Marocco, F. | |
dc.contributor.author | Day-Jones, A. C. | |
dc.contributor.author | Gomes, J. | |
dc.contributor.author | Forde, K.P. | |
dc.contributor.author | Lucas, P.W. | |
dc.contributor.author | Jones, H.R.A. | |
dc.date.accessioned | 2014-07-15T09:30:10Z | |
dc.date.available | 2014-07-15T09:30:10Z | |
dc.date.issued | 2012-10 | |
dc.identifier.citation | Catalan , 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.issn | 0004-6361 | |
dc.identifier.other | ORCID: /0000-0002-8872-4462/work/62748831 | |
dc.identifier.uri | http://hdl.handle.net/2299/13936 | |
dc.description.abstract | We 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.extent | 5 | |
dc.format.extent | 558086 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | white dwarfs | |
dc.subject | stars: Population II | |
dc.subject | stars: abundances | |
dc.subject | stars: individual: ULAS J074509.02+262705.0 | |
dc.subject | stars: individual: SDSS J074509.02+262705.0 | |
dc.subject | stars: fundamental parameters | |
dc.subject | DIGITAL-SKY-SURVEY | |
dc.subject | MODEL ATMOSPHERE ANALYSIS | |
dc.subject | LUMINOSITY FUNCTION | |
dc.subject | PHOTOMETRIC SYSTEM | |
dc.subject | SOLAR NEIGHBORHOOD | |
dc.subject | NORTHERN STARS | |
dc.subject | 3D KINEMATICS | |
dc.subject | SPY PROJECT | |
dc.subject | CATALOG | |
dc.title | The brightest pure-H ultracool white dwarf | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1051/0004-6361/201220191 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |