New ultracool and halo white dwarf candidates in SDSS Stripe 82

S. Vidrih, D. M. Bramich, P. C. Hewett, N. W. Evans, G. Gilmore, S. Hodgkin, M. Smith, L. Wyrzykowski, V. Belokurov, M. Fellhauer, M. J. Irwin, R. G. McMahon, D. Zucker, J. A. Munn, H. Lin, G. Miknaitis, H. C. Harris, R. H. Lupton, D. P. Schneider

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A 2°.5 × 100° region along the celestial equator (Stripe 82) has been imaged repeatedly from 1998 to 2005 by the Sloan Digital Sky Survey (SDSS). A new catalogue of ∼4 million light-motion curves, together with over 200 derived statistical quantities, for objects in Stripe 82 brighter than r ∼21.5 has been constructed by combining these data by Bramich et al. This catalogue is at present the deepest catalogue of its kind. Extracting ∼130 000 objects with highest signal-to-noise ratio proper motions, we build a reduced proper motion diagram to illustrate the scientific promise of the catalogue. In this diagram, disc and halo subdwarfs are well-separated from the cool white dwarf sequence. Our sample of 1049 cool white dwarf candidates includes at least eight and possibly 21 new ultracool H-rich white dwarfs (Teff < 4000 K) and one new ultracool He-rich white dwarf candidate identified from their SDSS optical and UKIDSS infrared photometry. At least 10 new halo white dwarfs are also identified from their kinematics.

Original languageEnglish
Pages (from-to)515-525
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume382
Issue number2
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes

Fingerprint

catalogs
halos
diagram
proper motion
signal-to-noise ratio
kinematics
diagrams
infrared photometry
equators
signal to noise ratios
curves

Keywords

  • Catalogues
  • Stars: atmospheres
  • Stars: evolution
  • White dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

New ultracool and halo white dwarf candidates in SDSS Stripe 82. / Vidrih, S.; Bramich, D. M.; Hewett, P. C.; Evans, N. W.; Gilmore, G.; Hodgkin, S.; Smith, M.; Wyrzykowski, L.; Belokurov, V.; Fellhauer, M.; Irwin, M. J.; McMahon, R. G.; Zucker, D.; Munn, J. A.; Lin, H.; Miknaitis, G.; Harris, H. C.; Lupton, R. H.; Schneider, D. P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 382, No. 2, 01.12.2007, p. 515-525.

Research output: Contribution to journalArticle

Vidrih, S, Bramich, DM, Hewett, PC, Evans, NW, Gilmore, G, Hodgkin, S, Smith, M, Wyrzykowski, L, Belokurov, V, Fellhauer, M, Irwin, MJ, McMahon, RG, Zucker, D, Munn, JA, Lin, H, Miknaitis, G, Harris, HC, Lupton, RH & Schneider, DP 2007, 'New ultracool and halo white dwarf candidates in SDSS Stripe 82', Monthly Notices of the Royal Astronomical Society, vol. 382, no. 2, pp. 515-525. https://doi.org/10.1111/j.1365-2966.2007.12429.x
Vidrih, S. ; Bramich, D. M. ; Hewett, P. C. ; Evans, N. W. ; Gilmore, G. ; Hodgkin, S. ; Smith, M. ; Wyrzykowski, L. ; Belokurov, V. ; Fellhauer, M. ; Irwin, M. J. ; McMahon, R. G. ; Zucker, D. ; Munn, J. A. ; Lin, H. ; Miknaitis, G. ; Harris, H. C. ; Lupton, R. H. ; Schneider, D. P. / New ultracool and halo white dwarf candidates in SDSS Stripe 82. In: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 382, No. 2. pp. 515-525.
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