J/A+A/683/A234 Cepheid Metallicity in the Leavitt Law Survey (Bhardwaj+, 2024)
Cepheid Metallicity in the Leavitt Law (C-MetaLL) Survey. V.
New multiband (grizJHKs) Cepheid light curves and period-luminosity relations.
Bhardwaj A., Ripepi V., Testa V., Molinaro R., Marconi M., De Somma G.,
Trentin E., Musella I., Storm J., Sicignano T., Catanzaro G.
<Astron. Astrophys. 683, A234 (2024)>
=2024A&A...683A.234B 2024A&A...683A.234B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, SDSS ; Optical
Keywords: techniques: photometric - stars: distances - stars: oscillations -
stars: variables: Cepheids - Galaxy: general -
cosmology: distance scale
Abstract:
The highly debated effect of metallicity on the absolute magnitudes of
classical Cepheid variables needs to be properly quantified for
determining accurate and precise distances based on their Leavitt Law.
Our goal is to obtain homogeneous optical and near-infrared light
curves of Milky Way Cepheid variables complementing their already
collected high-resolution spectroscopic metallicities as part of the
C-MetaLL survey. Together with Gaia parallaxes, we investigate
period-luminosity-metallicity relations for Cepheid variables at
multiple wavelengths.
We present homogeneous multiband (grizJHKs) time-series observations
of 78 Cepheids including 49 fundamental mode variables and 29
first-overtone mode variables. These observations were collected
simultaneously using the ROS2 and REMIR instruments at the Rapid Eye
Mount telescope.
The Cepheid sample covers a large range of distances (0.5-19.7kpc)
with varying precision of parallaxes, and thus astrometry-based
luminosity fits were used to derive PL and PW relations in optical
Sloan (griz) and near-infrared (JHKs) filters. These empirically
calibrated relations exhibit large scatter primarily due to larger
uncertainties in parallaxes of distant Cepheids, but their slopes
agree well with those previously determined in the literature. Using
homogeneous high-resolution spectroscopic metallicities of 61 Cepheids
covering -1.1<[Fe/H]<0.6dex, we quantified the metallicity dependence
of PL and PW relations which varies between -0.30±0.11 (in Ks) and
-0.55±0.12 (in z) mag/dex in grizJHKs bands. However, the
metallicity dependence in the residuals of the PL and PW relations is
predominantly seen for metal-poor stars ([Fe/H]←0.3dex), which also
have larger parallax uncertainties. The modest sample size precludes
us from separating the contribution to the residuals due to parallax
uncertainties, metallicity effects, and reddening errors. While this
Cepheid sample is not optimal for calibrating the Leavitt law,
upcoming photometric and spectroscopic datasets of the C-MetaLL survey
will allow the accurate derivation of PL and PW relations in the Sloan
and near-infrared bandpasses, which will be useful for the distance
measurements in the era of the Vera C. Rubin Observatory's Legacy
Survey of Space and Time and upcoming extremely large telescopes.
Description:
Multiband (grizJHKs) time-series observations of 78 Cepheids including
49 fundamental mode variables and 29 first-overtone mode variables.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 141 78 Pulsation properties of 78 Cepheids
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/MNRAS/508/4047 : 47 classical Cepheids HARPSN@TNG spectroscopy (Ripepi+ 2021)
J/A+A/674/A17 : Gaia Data Release 3. The Cepheids sample (Ripepi+, 2023)
J/A+A/681/A65 : Cepheids PL relation metallicity dependence (Trentin+, 2024)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Gaia DR3 Source ID
20 A1 --- n_GaiaDR3 [a] Note on GaiaDR3 (1)
22- 29 F8.5 d Per Pulsation period
31- 32 A2 --- Mode Pulsation mode (FU/FO)
34- 38 F5.2 mag gmag ?=99.90 Intensity-averaged magnitude in g-band
40- 44 F5.2 mag rmag Intensity-averaged magnitude in g-band
46- 50 F5.2 mag imag Intensity-averaged magnitude in i-band
52- 56 F5.2 mag zmag Intensity-averaged magnitude in z-band
58- 62 F5.2 mag Jmag Intensity-averaged magnitude in J-band
64- 68 F5.2 mag Hmag Intensity-averaged magnitude in H-band
70- 74 F5.2 mag Kmag ?=99.9 Intensity-averaged magnitude in K-band
76 A1 --- QF [ABC] Light curve quality flag (2)
78- 82 F5.2 mag E(B-V) ?=99.90 Color-excess E(B-V) from (3)
84- 88 F5.2 [-] [Fe/H] ?=99.90 Metallicities ([Fe/H])
90- 92 A3 --- Flag Source of [Fe/H] (4)
94- 98 F5.2 mag e_gmag ?=99.90 Uncertainty in gmag
100-103 F4.2 mag e_rmag Uncertainty in rmag
105-108 F4.2 mag e_imag Uncertainty in imag
110-113 F4.2 mag e_zmag Uncertainty in zmag
115-118 F4.2 mag e_Jmag Uncertainty in Jmag
120-123 F4.2 mag e_Hmag Uncertainty in Hmag
125-129 F5.2 mag e_Kmag ?=99.9 Uncertainty in Kmag
131-135 F5.2 mag e_E(B-V) ?=99.90 Uncertainty in E(B-V)
137-141 F5.2 [-] e_[Fe/H] ?=99.90 Uncertainty in [Fe/H]
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Note (1): : Note as follows:
a = The seven Cepheids that were not classified as variables in the Gaia DR3
Note (2): Quality flag of the light curve as follows:
A = best
B = good
C = poor
Note (3): From (Ripepi et al., 2023A&A...674A..17R 2023A&A...674A..17R, Cat. J/A+A/674/A17).
See Section 2.1 for details.
Note (4): References for metallicities as follows:
K21 = Kovtyukh et al., 2022MNRAS.510.1894K 2022MNRAS.510.1894K
R21 = Ripepi et al., 2021MNRAS.508.4047R 2021MNRAS.508.4047R, Cat. J/MNRAS/508/4047
T22 = Trentin et al., 2023MNRAS.519.2331T 2023MNRAS.519.2331T
RVS = Recio-Blanco et al., 2023A&A...674A..29R 2023A&A...674A..29R, see Cat. I/355
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Acknowledgements:
Anupam Bhardwaj, anupam.bhardwajj(at)gmail.com
References:
Bhardwaj et al., Paper I 2023ApJ...955L..13B 2023ApJ...955L..13B
Trentin et al., Paper II 2023MNRAS.519.2331T 2023MNRAS.519.2331T
Molinaro et al., Paper III 2023MNRAS.520.4154M 2023MNRAS.520.4154M
Trentin et al., Paper IV 2024A&A...681A..65T 2024A&A...681A..65T, Cat. J/A+A/681/A65
(End) Patricia Vannier [CDS] 19-Mar-2024