Toward a renewed Galactic Cepheid distance scale from Gaia and optical interferometry

Pierre Kervella, Antoine Mérand, Alexandre Gallenne, Boris Trahin, Nicolas Nardetto, Richard I. Anderson, Joanne Breitfelder, Laszlo Szabados, Howard E. Bond, Simon Borgniet, Wolfgang Gieren, Grzegorz Pietrzyński

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Through an innovative combination of multiple observing techniques and modeling, we are assembling a comprehensive understanding of the pulsation and close environment of Cepheids. We developed the SPIPS modeling tool that combines all observables (radial velocimetry, photometry, angular diameters from interferometry) to derive the relevant physical parameters of the star (effective temperature, infrared excess, reddening, ⋯) and the ratio of the distance and the projection factor d/p. We present the application of SPIPS to the long-period Cepheid RS Pup, for which we derive p = 1.25±0.06. The addition of this massive Cepheid consolidates the existing sample of p-factor measurements towards long-period pulsators. This allows us to conclude that p is constant or mildly variable around p = 1.29±0.04 (±3%) as a function of the pulsation period. The forthcoming Gaia DR2 will provide a considerable improvement in quantity and accuracy of the trigonometric parallaxes of Cepheids. From this sample, the SPIPS modeling tool will enable a robust calibration of the Cepheid distance scale.

Original languageEnglish
Title of host publicationWide-Field Variability Surveys
Subtitle of host publicationA 21st Century Perspective - 22nd Los Alamos Stellar Pulsation - Conference Series Meeting
EditorsWolfgang Gieren, Marcio Catelan, Wolfgang Gieren, Marcio Catelan
PublisherEDP Sciences
ISBN (Electronic)9782759890248
DOIs
Publication statusPublished - Sep 8 2017
Event22nd Los Alamos Stellar Pulsation Conference Series Meeting 2016 - San Pedro de Atacama, Chile
Duration: Nov 28 2016Dec 2 2016

Publication series

NameEPJ Web of Conferences
Volume152
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Other

Other22nd Los Alamos Stellar Pulsation Conference Series Meeting 2016
CountryChile
CitySan Pedro de Atacama
Period11/28/1612/2/16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kervella, P., Mérand, A., Gallenne, A., Trahin, B., Nardetto, N., Anderson, R. I., Breitfelder, J., Szabados, L., Bond, H. E., Borgniet, S., Gieren, W., & Pietrzyński, G. (2017). Toward a renewed Galactic Cepheid distance scale from Gaia and optical interferometry. In W. Gieren, M. Catelan, W. Gieren, & M. Catelan (Eds.), Wide-Field Variability Surveys: A 21st Century Perspective - 22nd Los Alamos Stellar Pulsation - Conference Series Meeting [07003] (EPJ Web of Conferences; Vol. 152). EDP Sciences. https://doi.org/10.1051/epjconf/201715207002