White dwarf variability with gPhoton : pulsators
| Autor: | Tucker, Michael A., Fleming, S.W., Pelisoli, Ingrid Domingos, Romero, Alejandra Daniela, Bell, Keaton, Kepler, Souza Oliveira, Caton, Daniel B., Debes, John, Montgomery, Michael Houston, Thompson, S. E., Koester, Detlev, Million, Chase, Shiao, Bernie |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
| Popis: | 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∼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. |
| Databáze: | OpenAIRE |
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