J/A+A/690/A246 Cepheid radial abundance gradients (Trentin+, 2024)
Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey:
VI: Radial abundance gradients of 29 chemical species in the Milky Way Disk.
Trentin E., Catanzaro G., Ripepi V., Alonso-Santiago J., Molinaro R.,
Storm J., De Somma G., Marconi M., Bhardwaj A., Gatto M., Musella I.,
Testa V.
<Astron. Astrophys. 690, A246 (2024)>
=2024A&A...690A.246T 2024A&A...690A.246T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry ; Optical ; Abundances ;
Radial velocities
Keywords: stars: abundances - stars: distances - stars: fundamental parameters -
stars: variables: Cepheids - Galaxy: disk
Abstract:
Classical Cepheids (DCEPs) are crucial for calibrating the
extragalactic distance ladder, ultimately enabling the determination
of the Hubble constant through the period-luminosity (PL) and
period-Wesenheit (PW) relations they exhibit. Hence, it's vital to
understand how the PL and PW relations depend on metallicity. This is
the purpose of the C-MetaLL survey, within which this work is
situated. DCEPs are also very important tracers of the young
populations placed along the Galactic disc.
We aim to enlarge the sample of DCEPs with accurate abundances from
high-resolution spectroscopy. In particular, our goal is to extend the
range of measured metallicities towards the metal-poor regime to
better cover the parameter space. To this end, we observed objects in
a wide range of Galactocentric radii, allowing us to study in detail
the abundance gradients present in the Galactic disc.
We present the results of the analysis of 331 spectra obtained for 180
individual DCEPs with a variety of high-resolution spectrographs. For
each target, we derived accurate atmospheric parameters, radial
velocities, and abundances for up to 29 different species. The iron
abundances range between 0.5 and ∼1dex with a rather homogeneous
distribution in metallicity. Results. The sample presented in this
paper was complemented with that already published in the context of
the C-MetaLL survey, resulting in a total of 292 pulsators whose
spectra have been analysed in a homogeneous way. These data were used
to study the abundance gradients of the Galactic disc in a range of
Galactocentric radii (RGC) spanning the range 5-20kpc.
For most of the elements we found a clear negative gradient, with a
slope of ∼0.064±0.003dex/kpc for [Fe/H] case. Through a
qualitative fit with the Galactic spiral arms we shown how our
farthest targets (RGC>10kpc) trace both the Outer and Outer
Scutum-Centaurus arms. The homogeneity of the sample will be of
pivotal importance for the study of the metallicity dependance of the
DCEP PL relations.
Description:
Main properties of the 180 program DCEPs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 179 180 Main properties of the 180 program DCEPs
table2.dat 117 331 Log of the observations for the 331 spectra
analysed in this work
table3.dat 349 180 Estimated chemical abundances for the
180 analysed DCEPs
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See also:
J/MNRAS/508/4047 : 47 classical Cepheids HARPSN@TNG spectroscopy (Ripepi+ 2021)
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- 28 A28 --- Star Literature name of the DCEP
30- 48 I19 --- GaiaDR3 Gaia DR3 identifier
50- 64 F15.11 deg RAdeg Right ascension (ICRS) at Ep=2016.0
66- 80 F15.11 deg DEdeg Declination (ICRS) at Ep=2016.0
82- 89 F8.5 d Period Period of pulsation
91-100 A10 --- Mode Mode of pulsation
102-107 F6.3 mag Gmag Gaia G magnitude
109-114 F6.3 mag BPmag Gaia BP magnitude
116-121 F6.3 mag RPmag Gaia RP magnitude
123-129 F7.4 mas Plx Gaia parallax
131-136 F6.4 mas e_Plx Gaia parallax error
138-142 F5.2 kpc d Distance
144-147 F4.2 kpc e_d Distance error
149-171 A23 --- Source Instrument used to observe the star
173-179 A7 --- Notes Origin of the periods and modes
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 28 A28 --- Star Name of the star
30- 40 F11.5 d HJD Heliocentric Julian Day
42- 47 A6 --- Phase Phase
49- 52 I4 s Texp Exposure time
54- 56 I3 --- SNR Signal-to-noise ratio
58- 61 I4 K Teff Effective temperature
63- 65 I3 K e_Teff Effective temperature error
67- 70 F4.2 [cm/s2] logg Logarithm of the gravity
72- 75 F4.2 [cm/s2] e_logg logg error
77- 79 F3.1 km/s xi Microturbulent velocity
81- 83 F3.1 km/s e_xi xi error
85- 88 F4.1 km/s Vbr Broadening velocity
90- 92 F3.1 km/s e_Vbr Vbr error
94- 99 F6.1 km/s RV Heliocentric radial velocity
101-103 F3.1 km/s e_RV RV error
105-117 A13 --- Source Instrument used to observe the star
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 28 A28 --- Star Name of the star
30- 34 F5.2 --- [C/H] Carbon abundance
36- 39 F4.2 --- e_[C/H] Carbon abundance error
41- 45 F5.2 --- [O/H] Oxygen abundance
47- 50 F4.2 --- e_[O/H] Oxygen abundance error
52- 56 F5.2 --- [Na/H] Sodium abundance
58- 61 F4.2 --- e_[Na/H] Sodium abundance error
63- 67 F5.2 --- [Mg/H] Magnesium abundance
69- 72 F4.2 --- e_[Mg/H] Magnesium abundance error
74- 79 F6.3 --- [Al/H] Alluminium abundance
81- 84 F4.2 --- e_[Al/H] Alluminium abundance error
86- 90 F5.2 --- [Si/H] Silicon abundance
92- 95 F4.2 --- e_[Si/H] Silicon abundance error
97-101 F5.2 --- [S/H] Solfur abundance
103-106 F4.2 --- e_[S/H] Solfur abundance error
108-112 F5.2 --- [Ca/H] Calcium abundance
114-117 F4.2 --- e_[Ca/H] Calcium abundance error
119-123 F5.2 --- [Sc/H] Scandium abundance
125-128 F4.2 --- e_[Sc/H] Scandium abundance error
130-134 F5.2 --- [Ti/H] Titanium abundance
136-139 F4.2 --- e_[Ti/H] Titanium abundance error
141-145 F5.2 --- [V/H] Vanadium abundance
147-150 F4.2 --- e_[V/H] Vanadium abundance error
152-156 F5.2 --- [Cr/H] Chromium abundance
158-161 F4.2 --- e_[Cr/H] Chromium abundance error
163-167 F5.2 --- [Mn/H] Manganese abundance
169-172 F4.2 --- e_[Mn/H] Manganese abundance error
174-178 F5.2 --- [Fe/H] Iron abundance
180-183 F4.2 --- e_[Fe/H] Iron abundance error
185-189 F5.2 --- [Co/H] Cobalt abundance
191-194 F4.2 --- e_[Co/H] Cobalt abundance error
196-200 F5.2 --- [Ni/H] Nickel abundance
202-205 F4.2 --- e_[Ni/H] Nickel abundance error
207-211 F5.2 --- [Cu/H] Copper abundance
213-216 F4.2 --- e_[Cu/H] Copper abundance error
218-222 F5.2 --- [Zn/H] Zinc abundance
224-227 F4.2 --- e_[Zn/H] Zinc abundance error
229-233 F5.2 --- [Sr/H] Strontium abundance
235-238 F4.2 --- e_[Sr/H] Strontium abundance error
240-244 F5.2 --- [Y/H] Yttrium abundance
246-249 F4.2 --- e_[Y/H] Yttrium abundance error
251-255 F5.2 --- [Zr/H] Zirconium abundance
257-260 F4.2 --- e_[Zr/H] Zirconium abundance error
262-266 F5.2 --- [Ba/H] Barium abundance
268-271 F4.2 --- e_[Ba/H] Barium abundance error
273-277 F5.2 --- [La/H] Lanthanum abundance
279-282 F4.2 --- e_[La/H] Lanthanum abundance error
284-288 F5.2 --- [Ce/H] Cerium abundance
290-293 F4.2 --- e_[Ce/H] Cerium abundance error
295-299 F5.2 --- [Pr/H] Praseodymium abundance
301-304 F4.2 --- e_[Pr/H] Praseodymium abundance error
306-310 F5.2 --- [Nd/H] Neodymium abundance
312-315 F4.2 --- e_[Nd/H] Neodymium abundance error
317-321 F5.2 --- [Sm/H] Samarium abundance
323-326 F4.2 --- e_[Sm/H] Samarium abundance error
328-332 F5.2 --- [Eu/H] Europium abundance
334-337 F4.2 --- e_[Eu/H] Europium abundance error
339-344 F6.3 --- [Gd/H] Gadolinium abundance
346-349 F4.2 --- e_[Gd/H] Gadolinium abundance error
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Acknowledgements:
Erasmo Trentin, etrentin(at)aip.de, erasmo.trentin(at)inaf.it
References:
Ripepi et al., Paper I 2021MNRAS.508.4047R 2021MNRAS.508.4047R, Cat. J/MNRAS/508/4047
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] 29-Aug-2024