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http://hdl.handle.net/20.500.12386/30753
Titolo: | THE PANCHROMATIC VIEW OF THE MAGELLANIC CLOUDS FROM CLASSICAL CEPHEIDS. I. DISTANCE, REDDENING, AND GEOMETRY OF THE LARGE MAGELLANIC CLOUD DISK | Autori: | INNO, LAURA Bono, G. Matsunaga, N. FIORENTINO, Giuliana MARCONI, Marcella Lemasle, B. Silva, R. da Soszyński, I. Udalski, A. Romaniello, M. Rix, H.-W. |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 832 | Fascicolo: | 2 | Da pagina:: | 176 | Abstract: | We present a detailed investigation of the Large Magellanic Cloud (LMC) disk using classical Cepheids. Our analysis is based on optical (I, V OGLE-IV), near-infrared (NIR: J, H, {K}{{S}}) and mid-infrared (MIR: w1; WISE) mean magnitudes. By adopting new templates to estimate the NIR mean magnitudes from single-epoch measurements, we build the currently most accurate, largest, and homogeneous multi-band data set of LMC Cepheids. We determine Cepheid individual distances using optical and NIR Period-Wesenheit relations (PWRs), to measure the geometry of the LMC disk and its viewing angles. Cepheid distances based on optical PWRs are precise at 3%, but accurate to 7%, while the ones based on NIR PWRs are more accurate (to 3%), but less precise (2%-15%), given the higher photometric error on the observed magnitudes. We found an inclination of I = 25.05 ± 0.02 (stat.) ± 0.55 (syst.) deg, and a position angle of the lines of nodes P.A. = 150.76 ± 0.02 (stat.) ± 0.07 (syst.) deg. These values agree well with estimates based either on young (Red Supergiants) or on intermediate-age (Asymptotic Giant Branch, Red Clump) stellar tracers, but they significantly differ from evaluations based on old (RR Lyrae) stellar tracers. This indicates that young/intermediate and old stellar populations have different spatial distributions. Finally, by using the reddening-law fitting approach, we provide a reddening map of the LMC disk, which is 10 times more accurate and 2 times larger than similar maps in the literature. We also found an LMC true distance modulus of {μ }0,{LMC}=18.48+/- 0.10 (stat. and syst.) mag, in excellent agreement with the currently most accurate measurement. | URI: | http://hdl.handle.net/20.500.12386/30753 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/832/2/176 | ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/832/2/176 | Bibcode ADS: | 2016ApJ...832..176I | Fulltext: | open |
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