https://doi.org/10.1051/epjconf/201715207010
The Araucaria Project. The distance to the Sculptor group galaxy NGC 7793 from near-infrared photometry of Cepheid variables
1 Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences, Warsaw, Poland
2 Astronomical Observatory of the University of Warsaw, Warsaw, Poland
3 Universidad de Concepción, Departamento de Astronomia, Concepción, Chile
4 Millennium Institute of Astrophysics, Santiago, Chile
Published online: 8 September 2017
We performed deep near-infrared J and K photometry of a field in the Sculptor Group spiral galaxy NGC 7793 using ESO VLT and HAWK-I instrument. We produced a sample of 14 Cepheids whose locations and periods of pulsation were known from our previous paper on distance determination to this galaxy based on V and I bands. We determined mean J and K magnitudes based on measurements from two nights and produced period-luminosity relations for both filters. Using those near-infrared dependencies together with relations for bands V and I obtained before, we were able to obtain true distance modulus for NGC 7793. We also calculated the mean reddening affecting our Cepheids.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
