The Cepheid phase lag revisited

R. Szabó, J. Robert Buchler, Justin Bartee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We compute the phase lags between the radial velocity curves and the light curves ΔΦ1 = φ1 Vr - φ1 mag for classical Cepheid model sequences both in the linear and the nonlinear regimes. The nonlinear phase lags generally fall below the linear ones except for high-period models, in which they lie above, and of course for low pulsation amplitudes, in which the two merge. The calculated phase lags show good agreement with the available observational data of normal amplitude Galactic Cepheids. The metallicity has but a moderate effect on the phase lag, while the mass-luminosity relation and the parameters of the turbulent convective model (time-dependent mixing length) mainly influence the modal selection and the period, which is then reflected in the period-ΔΦ1 diagram. We discuss the potential application of this observable as a discriminant for pulsation modes and as a test for ultralow-amplitude (ULA) pulsation.

Original languageEnglish
Pages (from-to)1150-1160
Number of pages11
JournalAstrophysical Journal
Volume667
Issue number2 I
DOIs
Publication statusPublished - 2007

Fingerprint

time lag
diagram
radial velocity
light curve
metallicity
diagrams
luminosity
curves
effect
test
parameter

Keywords

  • Cepheids
  • Instabilities
  • Stars: oscillations

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Space and Planetary Science

Cite this

Szabó, R., Buchler, J. R., & Bartee, J. (2007). The Cepheid phase lag revisited. Astrophysical Journal, 667(2 I), 1150-1160. https://doi.org/10.1086/520917

The Cepheid phase lag revisited. / Szabó, R.; Buchler, J. Robert; Bartee, Justin.

In: Astrophysical Journal, Vol. 667, No. 2 I, 2007, p. 1150-1160.

Research output: Contribution to journalArticle

Szabó, R, Buchler, JR & Bartee, J 2007, 'The Cepheid phase lag revisited', Astrophysical Journal, vol. 667, no. 2 I, pp. 1150-1160. https://doi.org/10.1086/520917
Szabó, R. ; Buchler, J. Robert ; Bartee, Justin. / The Cepheid phase lag revisited. In: Astrophysical Journal. 2007 ; Vol. 667, No. 2 I. pp. 1150-1160.
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