The projection factor of δ Cephei. A calibration of the Baade-Wesselink method using the CHARA Array

Details The projection factor of δ Cephei. A calibration of the Baade-Wesselink method using the CHARA Array The projection factor of δ Cephei. A calibration of the Baade-Wesselink method using the CHARA Array

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...438l...9m&link_type=abstract

Astronomy and Astrophysics, Volume 438, Issue 1, July IV 2005, pp.L9-L12

Astronomy and Astrophysics

Astrophysics

38

Techniques: Interferometric, Stars: Variables: Cepheids, Stars: Individual: Δ Cep, Cosmology: Distance Scale

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 1.5 sigmas. Our value is in line with recent theoretical predictions of Nardetto et al. (2004, A&A, 428, 131).

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