Journal
ASTRONOMICAL JOURNAL
Volume 154, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/aa9574
Keywords
galaxies: distances and redshift; galaxies: individual (Fornax); infrared: stars; stars: variables: RR Lyrae
Categories
Funding
- European Research Council (ERC) under the European Unions Horizon research and innovation program [695099]
- Polish National Science Centre [MAESTRO 2012/06/A/ST9/00269]
- BASAL Centro de Astrofisica y Tecnologias Afines (CATA) [PFB-06/2007]
- Millenium Institute of Astrophysics (MAS) of the Iniciativa Cientifica Milenio del Ministerio de Economia, Fomento y Turismo de Chile [IC120009]
- ESO programmes [082.D-0123(B), 092.D-0295(B)]
- STFC [ST/J001465/1, ST/H002391/1, PP/E001149/1, ST/L00061X/1, ST/F007159/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H002391/1, ST/M000966/1, ST/J001465/1, ST/L00061X/1, ST/F007159/1, PP/E001149/1] Funding Source: researchfish
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We have obtained single-phase near-infrared (NIR) magnitudes in the J and K bands for 77 RR Lyrae (RRL) stars in the Fornax Dwarf Spheroidal Galaxy. We have used different theoretical and empirical NIR period-luminosity-metallicity calibrations for RRL stars to derive their absolute magnitudes, and found a true, reddening-corrected distance modulus of 20.818 +/- 0.015(statistical) +/- 0.116(systematic) mag. This value is in excellent agreement with the results obtained within the Araucaria Project from the NIR photometry of red clump stars (20.858 +/- 0.013 mag), the tip of the red giant branch (20.84 +/- 0.04 +/- 0.14 mag), as well as with other independent distance determinations to this galaxy. The effect of metallicity and reddening is substantially reduced in the NIR domain, making this method a robust tool for accurate distance determination at the 5% level. This precision is expected to reach the level of 3% once the zero points of distance calibrations are refined thanks to the Gaia mission. NIR period-luminosity-metallicity relations of RRL stars are particularly useful for distance determinations to galaxies and globular clusters up to 300 kpc, that lack young standard candles, like Cepheids.
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