KIC11911480: the second ZZ Ceti in the $Kepler$ field

Abstract

We report the discovery of the second pulsating hydrogen-rich (DA) white dwarf in the $Kepler$ field, KIC11911480. It was selected from the $Kepler$-INT Survey (KIS) on the basis of its colours and its variable nature was confirmed using ground-based time-series photometry. An atmosphere model fit to an intermediate-resolution spectrum of KIC11911480 places this DA white dwarf close to the blue edge of the empirical boundaries of the ZZ Ceti instability strip: $T_{\mathrm{eff}}=12160\pm 250$ K and $\log g=7.94\pm 0.10$. Assuming a mass-radius relation and cooling models for DA white dwarfs, the atmospheric parameters yield: M${}_{\mathrm{WD}}$ = 0.57 $\pm$ 0.06 M${}_{\odot }$. We also obtained two quarters (Q12 and Q16) of nearly uninterrupted short-cadence $Kepler$ data on this star. We detect a total of six independent pulsation modes with a $\ge$ 3$\sigma$ confidence in its amplitude power spectrum. These pulsations have periods ranging between 172.9 s and 324.5 s, typical of the hotter ZZ Ceti stars. Our preliminary asteroseismic study suggest that KIC11911480 has a rotation rate of 3.5$\pm$0.5 days.

8 pages, 5 figures, accepted for publication in MNRAS

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