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New ultracool and halo white dwarf candidates in SDSS Stripe 82 |
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| Authors: | 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 |
| Affiliation: | Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;Astronomisches Rechen-Institut/Zentrum für Astronomie der Universität Heidelberg, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany;Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Canary Islands, Spain;US Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521, USA;Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA;Princeton University Observatory, Princeton, NJ 08544, USA;Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA |
| Abstract: | A 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 ( T |
| Keywords: | catalogues stars: atmospheres stars: evolution white dwarfs |