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| Paper: |
Cool White Dwarfs Identified in the WFCAM Transit Survey |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
235 |
| Authors: |
Catalán, S.; Napiwotzki, R.; Hodgkin, S.; Pinfield, D.; Cristobal Hornillos, D.; Tremblay, P.-E.; Isern, J.; García–Berro, E. |
| Abstract: |
We present results from our search for ultra-cool white dwarfs in the WTS (WFCAM Transit Survey).
Repeated observations starting in 2007 allowed to produce deep stacked images in J and
measure proper motions. We combine these with deep optical imaging to select candidate
ultra-cool white dwarfs (Teff < 4 000 K). About twenty white dwarf candidates with proper motions above 0.150
arcsec/yr were identified in one of the fields representing 1/8th of the survey area.
Follow-up spectroscopy with the 10.4 m GTC telescope at La Palma confirmed the white dwarf status
for all observed candidates. On-going work is being carried out to increase the sample
of cool white dwarfs that will allow a more comprehensive study of the thick disk/halo
white dwarf populations. |
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