학술논문
The Araucaria Project. The distance to the Sculptor group galaxy NGC 7793 from near-infrared photometry of Cepheid variables.
Document Type
Article
Author
Source
Subject
*CEPHEIDS
*SPIRAL galaxies
*EXTRAGALACTIC distances
*STELLAR oscillations
*STELLAR luminosity function
*INTERSTELLAR reddening
*STELLAR photometry
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Language
ISSN
2101-6275
Abstract
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. [ABSTRACT FROM AUTHOR]