The araucaria project: The distance to the local group galaxy WLM from near-infrared photometry of cepheid variables

Wolfgang Gieren, Grzegorz Pietrzyński, Olaf Szewczyk, Igor Soszyński, Fabio Bresolin, Rolf Peter Kudritzki, Miguel A. Urbaneja, Jesper Storm, Dante Minniti

Resultado de la investigación: Contribución a una revistaArtículo

27 Citas (Scopus)

Resumen

We have obtained deep images in the near-infrared J and K filters for several fields in the Local Group galaxy WLM. We report intensity mean magnitudes for 31 Cepheids located in these fields, which we previously discovered in a wide-field optical imaging survey of WLM. The data define tight period-luminosity relations in both near-infrared bands, which we use to derive the total reddening of the Cepheids in WLM and the true distance modulus of the galaxy from a multiwavelength analysis of the reddened distance moduli in the VIJK bands. From this, we obtain. the values E(B -V) = 0.082 ± 0.02 and (m - M)0 = 24.924 ± 0.042 mag, with a systematic uncertainty in the distance of about ±3%. This Cepheid distance agrees extremely well with the distance of WLM determined from the I-band tip of the red giant branch (TRGB) method by ourselves and others. Most of the reddening of the Cepheids in WLM (0.06 mag) is produced inside the galaxy, demonstrating again the need for an accurate determination of the total reddening and/or the use of infrared photometry to derive Cepheid distances which are accurate to 3% or better, even for small irregular galaxies like WLM.

Idioma originalInglés
Páginas (desde-hasta)611-619
Número de páginas9
PublicaciónAstrophysical Journal
Volumen683
N.º2
DOI
EstadoPublicada - 20 ago 2008

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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    Gieren, W., Pietrzyński, G., Szewczyk, O., Soszyński, I., Bresolin, F., Kudritzki, R. P., Urbaneja, M. A., Storm, J., & Minniti, D. (2008). The araucaria project: The distance to the local group galaxy WLM from near-infrared photometry of cepheid variables. Astrophysical Journal, 683(2), 611-619. https://doi.org/10.1086/589994