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Study of ZZ Cetis Kepler & Bárbara Castanheira: Frequency, Modes, and Physical Parameters

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Explore the known ZZ Cetis 87 and ZZ Cetis 147 in Montreal with bright novae and SDSS data. Analyze combined modes, periods, hydrogen layer mass, rotational and trapping properties. Key results include changes in period, rotation, radius, and diffusion timescales.

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Study of ZZ Cetis Kepler & Bárbara Castanheira: Frequency, Modes, and Physical Parameters

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  1. New ZZ Cetis S.O. Kepler & Bárbara Castanheira Brazil

  2. Montreal Bright NOV SDSS

  3. 147 known ZZ Cetis 87 SDSS

  4. Montreal Bright NOV SDSS

  5. Frequency

  6. NOV

  7. Combined modes Period (s)

  8. Hydrogen layer mass

  9. Our own SNR>50 strip: 160*

  10. PG1159-035 - DOV

  11. 198 identified modes

  12. Average multiplets i=70o

  13. Results • dP/dt (516s)= 1ms/yr = (13.146+0.003)x10-11 s/s, • (517s)=(15.172+0.045)x10-11s/s , (539s)=(-0.339+0.015)x10-11s/s • d2P/dt2 =(1.93+0.08)x10-20 s/s, (517s)=(-81.7+2.7)+10-20 s/s • Protation=1.3935+0.0008 d • dProt/dt=(-2.13+0.05)x10-6 s/s • dR/dt=(-2.8+0.2)x10-12 s/s • dT/dt=(-7.6+0.2)x10-11 s/s • Trapping at 0.83R*+0.05 • DP(l=1)=21.43+0.03s M=0.59+0.02 MSun • DP(l=2)=12.38+0.01s • B<2000G

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