Publicación: New LZ and PW(Z) relations of RR Lyrae stars calibrated with Gaia EDR3 parallaxes
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2022-03-17
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Atribución-NoComercial-SinDerivadas 4.0 Internacional
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Oxford Academic
Resumen
We present new luminosity–metallicity (LZ;
and
) relations and, for the first time, empirical, Gaia three-band (G, GBP, GRP) period-Wesenheit-metallicity (PWZ) relations of RR Lyrae stars (RRLs) derived using a hierarchical Bayesian approach and new accurate parallaxes published for these variables in the Gaia Early Data Release 3 (EDR3). In a previous study, we obtained Bayesian hierarchically derived LZ relations from a sample of about four hundred Milky Way field RRLs with G-band light curves and trigonometric parallaxes published in the Gaia Data Release 2 (DR2), using V mean magnitudes, metallicities, absorptions, and pulsation periods available in the literature. We now extend that study in two directions. First, we update our previous results using trigonometric parallaxes from Gaia EDR3 and incorporate the Bayesian analysis of a first empirical PWZ relation derived using those field RRLs with G, GBP and GRP time-series photometry available in Gaia DR2. Secondly, we use Bayesian inference to derive LZ relations and empirical PW Gaia three-band relations from 385 RRLs belonging to 15 Milky Way globular clusters (GC) with literature-compiled spectroscopic metallicities ranging from −0.36 to −2.39 dex and prior distances extending from 2.2 to 41.2 kpc. From the samples of RRLs analysed in this paper we infer a mean Gaia EDR3 zero-point offset of −0.028 mas with median values ranging from −0.033 (LZ and PWZ models for field stars) to −0.024 mas (LZ model in the V band for GC RRLs).
Descripción
The registered version of this article, first published in Monthly Notices of the Royal Astronomical Society, is available online at the publisher's website: Oxford Academic, https://doi.org/10.1093/mnras/stac735
La versión registrada de este artículo, publicado por primera vez en Monthly Notices of the Royal Astronomical Society, está disponible en línea en el sitio web del editor: Oxford Academic, https://doi.org/10.1093/mnras/stac735
La versión registrada de este artículo, publicado por primera vez en Monthly Notices of the Royal Astronomical Society, está disponible en línea en el sitio web del editor: Oxford Academic, https://doi.org/10.1093/mnras/stac735
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Palabras clave
methods: data analysis, methods: statistical, parallaxes, stars: variables: RR Lyrae, globular clusters: general
Citación
A Garofalo, H E Delgado, L M Sarro, G Clementini, T Muraveva, M Marconi, V Ripepi, New LZ and PW(Z) relations of RR Lyrae stars calibrated with Gaia EDR3 parallaxes, Monthly Notices of the Royal Astronomical Society, Volume 513, Issue 1, June 2022, Pages 788–806, https://doi.org/10.1093/mnras/stac735
Centro
Facultades y escuelas::E.T.S. de Ingeniería Informática
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Inteligencia Artificial