J/other/NatAs/7.1081 Double-mode RR Lyrae stars data (Chen+, 2023)
The use of double-mode RR Lyrae stars as robust distance and metallicity
indicators.
Chen X., Zhang J., Wang S., Deng L.
<Nature Astronomy, 7, 1081-1089 (2023)>
=2023NatAs...7.1081C 2023NatAs...7.1081C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Binaries, orbits ; Optical
Abstract:
RR Lyrae stars are one of the primary distance indicators for old
stellar populations such as globular clusters, dwarf galaxies and
galaxies. Typically, fundamental-mode RR Lyr stars are used for
distance measurements, and their accuracy is strongly limited by the
dependence of absolute magnitudes on metallicity, in both the optical
and infrared bands. Here, we report the discovery of a
period-(period ratio)-metallicity relation for double-mode RR Lyr
stars, which can predict metallicity as accurately as the
low-resolution spectra. With theoretical and observational evidence,
we propose that the period-luminosity relation of double-mode RR Lyr
stars is not affected by the metallicity. Combining the Large
Magellanic Cloud distance and Gaia parallaxes, we calibrate the zero
point of the period-luminosity relation to an error of 0.022mag,
which means that in the best case double-mode RR Lyr stars can anchor
galaxy distances to an accuracy of 1.0%. For four globular clusters
and two dwarf galaxies, we obtain distances using double-mode RR Lyr
stars with a distance accuracy of 2-3% and 1-2%, respectively.
With future telescopes such as the China Space Station Telescope and
the Vera C. Rubin Observatory, double-mode RR Lyr stars will be
established as an independent distance ladder in the near-field
universe.
Description:
The full data set of the RRd sample used to determine the
period-period ratio-metallicity relation is available in tables1.dat.
The full data set of the RRd sample used to determine the offset of
Gaia parallax is available in tables1.dat.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables1.dat 76 303 The full data set of the RRd sample used to
determine the period-period ratio-metallicity
relation
tables2.dat 82 126 The full data set of the RRd sample used to
determine the offset of Gaia parallax
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 12 F9.5 deg RAdeg Right ascension (J2000)
17- 25 F9.5 deg DEdeg Declination (J2000)
27- 35 F9.7 --- P1O/PF Period ratio
37- 45 F9.7 d P1O First overtone period
47- 55 F9.7 d PF Fundamental period
57- 62 F6.3 --- [Fe/H] Metallicity
65- 69 F5.3 --- e_[Fe/H] Metallicity error
71- 76 A6 --- r_[Fe/H] Reference survey for [Fe/H] (SDSS or LAMOST)
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Byte-by-byte Description of file: tables2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
4- 12 F9.5 deg RAdeg Right ascension (J2000)
17- 25 F9.5 deg DEdeg Declination (J2000)
29- 34 F6.3 mag WGBPRPmag Wesenheit magnitude (WG,BP,RP=G-1.90(BP-RP))
36- 44 F9.7 d P1O First overtone period
46- 54 F9.7 d PF Fundamental period
57- 61 F5.3 mas plxcorr Gaia DR3 corrected parallax
64- 68 F5.3 mas plx Gaia DR3 parallax
71- 75 F5.3 mas e_plx Gaia DR3 parallax error
77- 82 F6.3 --- [Fe/H]cal Calculated metallicity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-May-2024