White Dwarf Variability with gPhoton: Pulsators
| Autor: | Tucker, Michael A., Fleming, Scott W., Pelisoli, Ingrid, Romero, Alejandra, Bell, Keaton J., Kepler, S. O., Caton, Daniel B., Debes, John, Montgomery, Michael H., Thompson, Susan E., Koester, Detlev, Million, Chase, Shiao, Bernie |
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| Rok vydání: | 2017 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stx3297 |
| Popis: | We present results from a search for short time-scale white dwarf variability using \texttt{gPhoton}, a time-tagged database of \textit{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 $\sim 30$ minutes. 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 \textit{GALEX} data, providing observational insight into the wavelength dependence of white dwarf pulsation amplitudes. Comment: 13 pages, 15 figures, 6 tables. Accepted by MNRAS |
| Databáze: | arXiv |
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