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Outbursts in two new cool pulsating DA white dwarfs
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Bell, Keaton J., Hermes, J. J., Montgomery, M. H., Gentile Fusillo, N. P., Raddi, R., Gänsicke, B. T. (Boris T.), Winget, D. E., Dennihy, E., Gianninas, A., Tremblay, Pier-Emmanuel, Chote, Paul and Winget, K. I. (2016) Outbursts in two new cool pulsating DA white dwarfs. The Astrophysical Journal, 829 (2). p. 82. doi:10.3847/0004-637X/829/2/82
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Official URL: http://dx.doi.org/10.3847/0004-637X/829/2/82
Abstract
The unprecedented extent of coverage provided by Kepler observations recently revealed outbursts in two hydrogen-atmosphere pulsating white dwarfs (DAVs) that cause hours-long increases in the overall mean flux of up to 14%. We have identified two new outbursting pulsating white dwarfs in K2, bringing the total number of known outbursting white dwarfs to four. EPIC 211629697, with ${T}_{\mathrm{eff}}$ = 10,780 ± 140 K and $\mathrm{log}\,g$ = 7.94 ± 0.08, shows outbursts recurring on average every 5.0 days, increasing the overall flux by up to 15%. EPIC 229227292, with ${T}_{\mathrm{eff}}$ = 11,190 ± 170 K and $\mathrm{log}\,g$ = 8.02 ± 0.05, has outbursts that recur roughly every 2.4 days with amplitudes up to 9%. We establish that only the coolest pulsating white dwarfs within a small temperature range near the cool, red edge of the DAV instability strip exhibit these outbursts.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Stellar activity, Astrophysics | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 23 September 2016 | ||||||||
| Dates: |
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| Volume: | 829 | ||||||||
| Number: | 2 | ||||||||
| Number of Pages: | 11 | ||||||||
| Page Range: | p. 82 | ||||||||
| DOI: | 10.3847/0004-637X/829/2/82 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | National Science Foundation (U.S.) (NSF), United States. National Aeronautics and Space Administration (NASA), Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC) | ||||||||
| Grant number: | AST-1312983 (NSF), NNX13AC23G (NASA), HST-HF2-51357.001-A (NASA), FP/2007-2013 (FP7), No. 320964 (ERC), AST-1312678 (NSF), NNX14AF65G (NASA) |
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