G 207-9 and LP 133-144: Light-curve analysis and asteroseismology of two ZZ Ceti stars

Zs Bognár, M. Paparó, L. Molnár, I. Pápics, E. Plachy, E. Verebélyi, Sódor

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

G 207-9 and LP 133-144 are two rarely observed ZZ Ceti stars located in the middle and close to the blue edge of the ZZ Ceti instability domain, respectively. We aimed to observe them at least during one observing season atKonkolyObservatory with the purpose of extending the list of known pulsation modes for asteroseismic investigations and detect any significant changes in their pulsational behaviour. We determined five and three new normal modes of G 207-9 and LP 133-144, respectively. In LP 133-144, our frequency analysis also revealed that at least at three modes there are actually triplets with frequency separations of ~4 μHz. The rotational period of LP 133-144 based on the triplets is ~42 h. The preliminary asteroseismic fits of G 207-9 predict Teff = 12 000 or 12 400 K and M* = 0.855-0.870M values for the effective temperature and mass of the star, depending on the assumptions on the spherical degree (l) values of the modes. These results are in agreement with the spectroscopic determinations. In the case of LP 133-144, the best-fitting models prefer Teff = 11 800 K in effective temperature and M* = 0.71M stellar masses, which are more than 0.1M larger than the spectroscopic value.

Original languageEnglish
Pages (from-to)4059-4070
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume461
Issue number4
DOIs
Publication statusPublished - Oct 1 2016

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asteroseismology
light curve
stars
frequency analysis
temperature
stellar mass
lists
analysis

Keywords

  • G 207-9-stars
  • Individual
  • Individual
  • Interiors-stars
  • LP 133-144-stars
  • Oscillations-white dwarfs
  • Photometric-stars
  • Techniques

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

G 207-9 and LP 133-144 : Light-curve analysis and asteroseismology of two ZZ Ceti stars. / Bognár, Zs; Paparó, M.; Molnár, L.; Pápics, I.; Plachy, E.; Verebélyi, E.; Sódor.

In: Monthly Notices of the Royal Astronomical Society, Vol. 461, No. 4, 01.10.2016, p. 4059-4070.

Research output: Contribution to journalArticle

Bognár, Zs ; Paparó, M. ; Molnár, L. ; Pápics, I. ; Plachy, E. ; Verebélyi, E. ; Sódor. / G 207-9 and LP 133-144 : Light-curve analysis and asteroseismology of two ZZ Ceti stars. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 461, No. 4. pp. 4059-4070.
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AB - G 207-9 and LP 133-144 are two rarely observed ZZ Ceti stars located in the middle and close to the blue edge of the ZZ Ceti instability domain, respectively. We aimed to observe them at least during one observing season atKonkolyObservatory with the purpose of extending the list of known pulsation modes for asteroseismic investigations and detect any significant changes in their pulsational behaviour. We determined five and three new normal modes of G 207-9 and LP 133-144, respectively. In LP 133-144, our frequency analysis also revealed that at least at three modes there are actually triplets with frequency separations of ~4 μHz. The rotational period of LP 133-144 based on the triplets is ~42 h. The preliminary asteroseismic fits of G 207-9 predict Teff = 12 000 or 12 400 K and M* = 0.855-0.870M⊙ values for the effective temperature and mass of the star, depending on the assumptions on the spherical degree (l) values of the modes. These results are in agreement with the spectroscopic determinations. In the case of LP 133-144, the best-fitting models prefer Teff = 11 800 K in effective temperature and M* = 0.71M⊙ stellar masses, which are more than 0.1M⊙ larger than the spectroscopic value.

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