Issue |
A&A
Volume 423, Number 1, August III 2004
|
|
---|---|---|
Page(s) | 327 - 333 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20035596 | |
Published online | 29 July 2004 |
Cepheid distances from infrared long-baseline interferometry
II. Calibration of the period–radius and period–luminosity relations
1
LESIA, UMR 8109, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon Cedex, France e-mail: pierre.kervella@obspm.fr
2
European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago 19, Chile
3
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
4
Observatoire de la Côte d'Azur, Département GEMINI, UMR 6203, BP 4229, 06304 Nice Cedex 4, France
Received:
29
October
2003
Accepted:
4
May
2004
Using our interferometric angular diameter measurements of seven classical Cepheids reported in Kervella et al. ([CITE], A&A, 416, 941 – Paper I), complemented by previously
existing measurements, we derive new calibrations of the Cepheid
period–radius (P–R) and period–luminosity (P–L) relations. We
obtain a P–R relation of , only 1 σ away from the relation
obtained by Gieren et al. ([CITE], ApJ, 496, 17). We therefore confirm
their P–R relation at a level of
.
We also derive an original calibration of the P–L relation, assuming
the slopes derived by Gieren et al. ([CITE]) from LMC
Cepheids,
and
. With a P–L relation of the form
, we obtain
reference points of
and
. Our calibration in the V band is statistically
identical to the geometrical result of Lanoix et al. ([CITE], MNRAS, 308, 969).
Key words: stars: variables: Cepheids / cosmology: distance scale / stars: oscillations / techniques: interferometric
© ESO, 2004
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