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http://hdl.handle.net/20.500.12386/31905
Titolo: | The VMC Survey -- XLII. Near-infrared period-luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud | Autori: | CUSANO, FELICE Moretti, Maria Ida CLEMENTINI, Gisella RIPEPI, Vincenzo MARCONI, Marcella Cioni, M. -R. L. RUBELE, STEFANO Garofalo, A. de Grijs, R. Groenewegen, M. A. T. Oliveira, J. M. Subramanian, S. Sun, N. -C. van Loon, J. Th. |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 504 | Fascicolo: | 1 | Da pagina:: | 1 | Abstract: | We present results from an analysis of $\sim$ 29,000 RR Lyrae stars located in the Large Magellanic Cloud (LMC). For these objects, near-infrared time-series photometry from the VISTA survey of the Magellanic Clouds system (VMC) and optical data from the OGLE (Optical Gravitational Lensing Experiment) IV survey and the Gaia Data Release 2 catalogue of confirmed RR Lyrae stars were exploited. Using VMC and OGLE IV magnitudes we derived period-luminosity (PL), period-luminosity-metallicity (PLZ), period-Wesenheit (PW) and period-Wesenheit-metallicity (PWZ) relations in all available bands. More that ~7,000 RR Lyrae were discarded from the analysis because they appear to be overluminous with respect to the PL relations. The $PL_{K_{\mathrm{s}}}$ relation was used to derive individual distance to $\sim 22,000$ RR Lyrae stars, and study the three-dimensional structure of the LMC. The distribution of the LMC RR Lyrae stars is ellipsoidal with the three axis $S_1$=6.5 kpc, $S_2$=4.6 kpc and $S_3$=3.7 kpc, inclination i=$22\pm4^{\circ }$ relative to the plane of the sky and position angle of the line of nodes $\theta=167\pm7^{\circ }$ (measured from north to east). The north-eastern part of the ellipsoid is closer to us and no particular associated substructures are detected as well as any metallicity gradient. | URI: | http://hdl.handle.net/20.500.12386/31905 | URL: | http://arxiv.org/abs/2103.15492v1 https://academic.oup.com/mnras/article-abstract/504/1/1/6206842?redirectedFrom=fulltext&login=false |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab901 | Fulltext: | open |
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