EDP Sciences
Free access
Volume 445, Number 3, January III 2006
Page(s) 901 - 906
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20053822

A&A 445, 901-906 (2006)
DOI: 10.1051/0004-6361:20053822

Variable stars in nearby galaxies

VII. P-L relation in the BVRI bands of Cepheids in IC 1613
E. Antonello1, L. Fossati1, D. Fugazza1, L. Mantegazza1 and W. Gieren2

1  INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy
    e-mail: elio@merate.mi.astro.it
2  Grupo de Astronomia, Departamento de Fisica, Universidad de Concepción, Casilla 160-C, Concepción, Chile
    e-mail: wgieren@astro-udec.cl

(Received 13 July 2005 / Accepted 12 September 2005 )

A set of six BVRI observations collected with the WFI at the ESO 2.2 m telescope have been used to derive multicolor data of Cepheids in IC 1613 identified in previous surveys. Since part of the previously known data were obtained only in VI filters or without filter (Wh) bands, the method of Freedman has been applied to get reliable mean intensity values of Cepheid magnitudes in the various bands. The resulting slopes of the relations in the BVI bands are similar, within the uncertainties, to those previously obtained by other authors for the LMC. The distribution of the Cepheids in the period-color diagrams is compatible with a change near $P \sim 10$ d as observed in LMC. The distribution in the color-color diagrams is more similar to that in SMC, and this should be related to the very low metallicity of the galaxy.

Key words: stars: variables: Cepheids -- galaxies: individual: IC 1613 -- galaxies: Local Group -- galaxies: stellar content

SIMBAD Objects
Tables at the CDS

© ESO 2006