Evidence for a universal slope of the period-luminosity relation from direct distances to Cepheids in the LMC. - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2005

Evidence for a universal slope of the period-luminosity relation from direct distances to Cepheids in the LMC.

Wolfgang Gieren
Jesper Storm
Thomas G. Barnes
  • Fonction : Auteur
Grzegorz Pietrzynski
  • Fonction : Auteur
Francesco Kienzle
  • Fonction : Auteur

Résumé

We have applied the infrared surface brightness (ISB) technique to derive distances to 13 Cepheid variables in the LMC which have periods from 3-42 days. The corresponding absolute magnitudes define PL relations in VIWJK bands which agree exceedingly well with the corresponding Milky Way relations obtained from the same technique, and are in significant disagreement with the observed LMC Cepheid PL relations, by OGLE-II and Persson et al., in these bands. Our data uncover a systematic error in the p-factor law which transforms Cepheid radial velocities into pulsational velocities. We correct the p-factor law by requiring that all LMC Cepheids share the same distance. Re-calculating all Milky Way and LMC Cepheid distances with the revised p-factor law, we find that the PL relations from the ISB technique both in LMC and in the Milky Way agree with the OGLE-II and Persson et al. LMC PL relations, supporting the conclusion of no metallicity effect on the slope of the Cepheid PL relation in optical/near infrared bands.

Dates et versions

hal-00285437 , version 1 (05-06-2008)

Identifiants

Citer

Wolfgang Gieren, Jesper Storm, Thomas G. Barnes, Pascal Fouqué, Grzegorz Pietrzynski, et al.. Evidence for a universal slope of the period-luminosity relation from direct distances to Cepheids in the LMC.. 2005. ⟨hal-00285437⟩
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