Interferometric Observations of Cepheids: the p-factor measurement

Details Interferometric Observations of Cepheids: the p-factor measurement Interferometric Observations of Cepheids: the p-factor measurement

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..311m&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astronomy

Scientific paper

Cepheids play a key role in astronomy as standard candles for measuring intergalactic distances. Their distance is usually inferred from the Period-Luminosity relationship, calibrated using the semi-empirical Baade-Wesselink method. Using this method, the distance is known to a multiplicative factor, called the projection factor. Presently, this factor is computed using numerical models -- it has hitherto never been measured directly. Based on our new interferometric measurements obtained with the CHARA Array and the already published parallax, we present a geometrical measurement of the projection factor of a Cepheid, δ Cep. The value we determined, p=1.27±0.06, confirms the generally adopted value of p=1.36 within 1.5σ. Our value is in line with recent theoretical predictions of Nardetto et al. (2004).

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