2015
DOI: 10.1088/0004-637x/799/2/165
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On the Distance of the Globular Cluster M4 (Ngc 6121) Using Rr Lyrae Stars. I. Optical and Near-Infrared Period-Luminosity and Period-Wesenheit Relations

Abstract: We present new distance determinations to the nearby globular M4 (NGC 6121) based on accurate optical and Near Infrared (NIR) mean magnitudes for fundamental (FU) and first overtone (FO) RR Lyrae variables (RRLs), and new empirical optical and NIR Period-Luminosity (PL) and Period-Wesenheit (PW) relations. We have found that optical-NIR and NIR PL and PW relations are affected by smaller standard deviations than optical relations. The difference is the consequence of a steady decrease in the intrinsic spread o… Show more

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Cited by 91 publications
(123 citation statements)
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“…The amplitude ratios were estimated using the bi-weight to remove the outliers (Beers et al 1990;Fabrizio et al 2011;Braga et al 2015). The individual values for RRab, RRc and for the global (All) samples are listed in Table 4 together with their errors and standard deviations.…”
Section: Luminosity Amplitude Ratiomentioning
confidence: 99%
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“…The amplitude ratios were estimated using the bi-weight to remove the outliers (Beers et al 1990;Fabrizio et al 2011;Braga et al 2015). The individual values for RRab, RRc and for the global (All) samples are listed in Table 4 together with their errors and standard deviations.…”
Section: Luminosity Amplitude Ratiomentioning
confidence: 99%
“…Following Braga et al (2015) and Marconi et al (2015) we evaluated the PL relations for RRc, RRab and for the global (All) sample. In the global sample the RRc were "fundamentalized," i.e., we adopted = + P P log log 0.127 Iben & Huchra 1971;Rood 1973;Cox et al 1983;Di Criscienzo et al 2004;Coppola et al 2015).…”
Section: Pl Relationsmentioning
confidence: 99%
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“…Furthermore, the instability strip itself becomes narrower at longer wavelengths and, as a consequence, the color term responsible for the intrinsic dispersion on the PL relations vanishes (Catelan et al 2004;Marconi et al 2015). This means that at mid-infrared (MIR) wavelengths PL relations provide for more precise distance indicators (Braga et al 2015). 3.…”
Section: Introductionmentioning
confidence: 99%
“…This theoretical framework was applied with success to observational samples, e.g. in the Galactic globular cluster M4 (see [6]) and in the dwarf spheroidal galaxy Carina (see [9]). An important new prediction of these models was an analytical relation to infer double mode RR Lyrae masses as a function of the period ratio and the metallicity.…”
Section: A New Theoretical Scenario For Rr Lyrae Stars: the Dependencmentioning
confidence: 99%