Pesquisa de S.O. Kepler em 1999-2000
Anãs Brancas Pulsantes

Escala Evolucionária da Pré-Anã Branca PG1159-035

Tef=140 000K

Costa, J.E.S.; Kepler, S.O.; Winget, D.E. 1999, "Direct Measurement of a Secular Pulsation Period Change in the Pulsating Hot Pre-White Dwarf PG 1159-035", Astrophysical Journal, 522, 973-982.
histograma
PG1159-035 O-C

O relógio ótico mais preciso do Universo: G117-B15A

Kepler, S.O., Mukadam,A., Winget, D.E., Nather, R.E., Metcalfe, T.S., Reed, M.D., Kawaler, S.D. & Bradley, P.A. 2000, "Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known", Astrophysical Journal Letters, accepted.
G117-B15A O-C

A Faixa de Instabilidade das Estrelas ZZ Cetis

Kepler, S.O., da Costa, A.F.M., Giovannini, O. & Koester, D. 2000, "The ML1/alpha=2 Instability Strip of the ZZ Ceti Stars", Baltic Astronomy, accepted.
Inst. Strip

A Distribuição de Massa das Anãs Brancas

Mass Dist

Observações com o Telescópio Espacial Hubble de Anãs Brancas Pulsantes

Kepler, S.O., Robinson, E.L., Koester, D., Clemens, J.C., Nather, R.E. & Jiang, X.J. 2000, "Mode Identification of Pulsating White Dwarfs using the HST", Astrophysical Journal, Aug. issue.
  1. G226-29, DAV, Tef=12500K
  2. PG1346+489, DBV, Tef=22500K
  3. G185-32, DAV, Tef=11500K
  4. GD358, DBV, Tef=25000K
  5. BPM37073, DAV, Tef=12500K, Massa = 1.1 MSol - cristalizada
ampt
Zero Order
G226-29 amp
G185-32 DFT
G185-32 amp
SOAR
©kepler@if.ufrgs.br
22 mar 2000