Metallicity Distribution of Galactic Halo Field RR Lyræ, and the Effect of Metallicity on Their Pulsation Properties

Date Issued
2021
Author(s)
Marengo, M.
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Mullen, J.
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Neeley, J. R.
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•
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Magurno, D.
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Crestani, J.
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Monelli, M.
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Chaboyer, B.
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Gilligan, C. K.
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Martinez-Vazquez, C. E.
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Thevenin, F.
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Matsunaga, N.
Abstract
We present our analysis of a large sample (over 150k) of candidate Galactic RR Lyrae (RRL) stars for which we derived high quality photometry at UV, optical and infrared wavelengths, using data from publicly available surveys. For a sub-sample of these stars (∼ 2,400 fundamental mode field RRLs) we have measured their individual metallicity using the ΔS method, resulting in the largest and most homogeneous spectroscopic data set collected for RRLs. We use this sample to study the metallicity distribution in the Galactic Halo, including the long-standing problem of the Oosterhoff dichotomy among Galactic globular clusters. We also analyze the dependence of their pulsation properties, and in particular the shape of their infrared light curves, from their [Fe/H] abundance.
Coverage
RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
All editors
Kinemuchi, Karen; Lovekin, Catherine; Neilson, Hilding; Vivas, Kathy
Series
Volume
529
Start page
139
Conferenece
RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators
Uri
Url
Issn Identifier
1050-3390
Ads BibCode
2021ASPC..529..139M
Rights
open.access
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