期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 475, 期 4, 页码 4768-4780出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx3297
关键词
techniques: photometric; stars: oscillations; white dwarfs; ultraviolet: stars
资金
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- National Aeronautics and Space Administration [NNX08AR22G]
- ESO Program [179.A-2010]
- Spanish MICINN [AyA2011-24052]
- National Science Foundation [AST-1238877]
- NSF [AST-1312983]
- CNPq-Brazil
We present results from a search for short time-scale white dwarf variability using gPhoton, a time-tagged data base of GALEX photon events and associated software package. We conducted a survey of 320 white dwarf stars in the McCook-Sion catalogue, inspecting each for photometric variability with particular emphasis on variability over time-scales less than similar to 30 min. From that survey, we present the discovery of a new pulsating white dwarf: WD 2246-069. A Ca II K line is found in archival ESO spectra and an IR excess is seen in WISE W1 and W2 bands. Its independent modes are identified in follow-up optical photometry and used to model its interior structure. Additionally, we detect UV pulsations in four previously known pulsating ZZ Ceti-type (DAVs). Included in this group is the simultaneous fitting of the pulsations of WD 1401-147 in optical, near-ultraviolet and far-ultraviolet bands using nearly concurrent Whole Earth Telescope and GALEX data, providing observational insight into the wavelength dependence of white dwarf pulsation amplitudes.
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