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MID-INFRARED PERIOD-METALLICITY-LUMINOSITY RELATIONS AND KINEMATICS OF RR LYRAE VARIABLES

  • DAMBIS, ANDREI K. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University) ;
  • BERDNIKOV, L.N. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University) ;
  • KNIAZEV, A. YU. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University) ;
  • KRAVTSOV, V.V. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University) ;
  • RASTORGUEV, A.S. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University) ;
  • SEFAKO, R. (South African Astronomical Observatory) ;
  • VOZYAKOVA, O.V. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University) ;
  • ZABOLOTSKIKH, M.V. (Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University)
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30
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Abstract

We use ALLWISE data release W1- and W2-band epoch photometry collected by the Wide-Field Infrared Survey Explorer (WISE) to determine slopes of the period-luminosity relations for RR Lyrae stars in 15 globular clusters in the corresponding bands. We further combine these results with V- and K-band photometry of Galactic field RR Lyrae stars to determine the metallicity slopes of the log $P_F-[Fe/H]-M_K$, log $P_F-[Fe/H]-M_{W1}$, and log $P_F-[Fe/H]-M_{W2}$ period-metallicity-luminosity relations. We infer the zero points of these relations and determine the kinematical parameters of thick-disk and halo RR Lyraes via statistical parallax, and estimate the RR Lyrae-based distances to 18 Local-Group galaxies including the center of the Milky Way.

Keywords

References

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