Details

Autor(en) / Beteiligte

• Kervella, Pierre
• Mérand, Antoine
• Gallenne, Alexandre
• Trahin, Boris
• Borgniet, Simon
• Pietrzynski, Grzegorz
• Nardetto, Nicolas
• Gieren, Wolfgang

Titel

Optical interferometry and Gaia parallaxes for a robust calibration of the Cepheid distance scale

Ist Teil von

• Proceedings of the International Astronomical Union, 2017-04, Vol.12 (S330), p.305-308

Ort / Verlag

Cambridge, UK: Cambridge University Press

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We present the modeling tool we developed to incorporate multi-technique observations of Cepheids in a single pulsation model: the Spectro-Photo-Interferometry of Pulsating Stars (SPIPS). The combination of angular diameters from optical interferometry, radial velocities and photometry with the coming Gaia DR2 parallaxes of nearby Galactic Cepheids will soon enable us to calibrate the projection factor of the classical Parallax-of-Pulsation method. This will extend its applicability to Cepheids too distant for accurate Gaia parallax measurements, and allow us to precisely calibrate the Leavitt law's zero point. As an example application, we present the SPIPS model of the long-period Cepheid RS Pup that provides a measurement of its projection factor, using the independent distance estimated from its light echoes.