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| Paper: |
Measuring the Evolutionary Rate of Cooling of ZZ Ceti |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
15 |
| Authors: |
Mukadam, A. S.; Kim, A.; Montgomery, M. H.; Córsico, A. H.; Kepler, S. O.; Romero, A. D.; Winget, D. E.; Fraser, O.; Riecken, T. S.; Kronberg, M. E.; Hermes, J. J.; Winget, K. I.; Falcon, R. E.; Chandler, D. W.; Kuehne, J. W.; Sullivan, D. J.; Reaves, D.; von Hippel, T.; Mullally, F.; Shipman, H.; Thompson, S. E.; Silvestri, N. M.; Hynes, R. I. |
| Abstract: |
We have finally measured the evolutionary rate of cooling
of the pulsating hydrogen atmosphere white dwarf ZZ Ceti (R548), as reflected by the 213.13260694 s period.
Using 41 years of time-series photometry from 1970 to 2011,
we determine its rate of change of period with time to be
dP/dt = (3.0 ± 1.4) × 10–15 s/s with the O–C method and
(3.23 ± 0.87) × 10–15 s/s using
the nonlinear least squares fit, after
correcting for proper motion. We augment the uncertainty to a more realistic value and arrive
at the evolutionary cooling rate of (3.2 ± 1.2) × 10–15 s/s for ZZ Ceti,
consistent with the measurement of (4.19 ± 0.73) × 10–15 s/s for
G117-B15A. |
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