A preliminary calibration of the RR Lyrae period-luminosity relation at mid-infrared wavelengths: Wise data

Barry F. Madore, Douglas Hoffman, Wendy L. Freedman, Juna A. Kollmeier, Andy Monson, S. Eric Persson, Jeff A. Rich, Victoria Scowcroft, Mark Seibert

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Abstract

Using time-resolved, mid-infrared data from the Wide-field Infrared Survey Explorer (WISE) and geometric parallaxes from the Hubble Space Telescope for four Galactic RR Lyrae variables, we derive the following Population II period-luminosity (PL) relations for the WISE [W1], [W2], and [W3] bands at 3.4, 4.6, and 12 μm, respectively: The slopes and the scatter around the fits are consistent with a smooth extrapolation of those same quantities from previously published K-band observations at 2.2 μm, where the asymptotic (long-wavelength) behavior is consistent with a period-radius relation with a slope of 0.5. No obvious correlation with metallicity (spanning 0.4 dex in [Fe/H]) is found in the residuals of the four calibrating RR Lyrae stars about the mean PL regression line.

Original languageEnglish (US)
Article number135
JournalAstrophysical Journal
Volume776
Issue number2
DOIs
StatePublished - Oct 20 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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