J/MNRAS/492/3241 The Pristine survey. IX. (Venn+, 2020)
The Pristine survey
IX. CFHT ESPaDOnS spectroscopic analysis of 115 bright metal-poor candidate
stars.
Venn K.A., Kielty C.L., Sestito F., Starkenburg E., Martin N., Aguado D.S.,
Arentsen A., Bonifacio P., Caffau E., Hill V., Jablonka P., Lardo C.,
Mashonkina L., Navarro J.F., Sneden C., Thomas G., Youakim K.,
Gonzalez-Hernandez J.I., Sanchez Janssen R., Carlberg R., Malhan K.
<Mon. Not. R. Astron. Soc., 492, 3241-3262 (2020)>
=2020MNRAS.492.3241V 2020MNRAS.492.3241V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, metal-deficient ; Stars, population II ; Abundances ;
Radial velocities ; Proper motions ; Space velocities ;
Photometry, SDSS ; Spectra, optical
Keywords: Galaxy: stellar content - Galaxy: kinematics and dynamics -
Galaxy: abundances - stars: Population II - stars: abundances -
stars: kinematics and dynamics
Abstract:
A chemo-dynamical analysis of 115 metal-poor candidate stars selected
from the narrow-band Pristine photometric survey is presented based on
CFHT high-resolution ESPaDOnS spectroscopy. We have discovered 28 new
bright (V<15) stars with [Fe/H]←2.5 and 5 with [Fe/H]←3.0 for
success rates of 40 (28/70) and 19 per cent (5/27), respectively. A
detailed model atmosphere analysis is carried out for the 28 new
metal-poor stars. Stellar parameters were determined from SDSS
photometric colours, Gaia DR2 parallaxes, MESA/MIST stellar
isochrones, and the initial Pristine survey metallicities, following a
Bayesian inference method. Chemical abundances are determined for 10
elements (Na, Mg, Ca, Sc, Ti, Cr, Fe, Ni, Y, and Ba). Most stars show
chemical abundance patterns that are similar to the normal metal-poor
stars in the Galactic halo; however, we also report the discoveries of
a new r-process-rich star, a new CEMP-s candidate with [Y/Ba]>0, and a
metal-poor star with very low [Mg/Fe]. The kinematics and orbits for
all of the highly probable metal-poor candidates are determined by
combining our precision radial velocities with Gaia DR2 proper
motions. Some stars show unusual kinematics for their chemistries,
including planar orbits, unbound orbits, and highly elliptical orbits
that plunge deeply into the Galactic bulge (Rperi<0.5kpc); also,
eight stars have orbital energies and actions consistent with the
Gaia-Enceladus accretion event. This paper contributes to our
understanding of the complex chemo-dynamics of the metal-poor Galaxy,
and increases the number of known bright metal-poor stars available
for detailed nucleosynthetic studies.
Description:
Targets were selected from the Pristine survey catalogue which
includes 28557 bright (V<15) stars in the original ∼1000sq.deg2
footprint between 180<RA<256° and +00<Dec<+16° (Starkenburg et
al. 2017MNRAS.471.2587S 2017MNRAS.471.2587S; Youakim et al. 2017MNRAS.472.2963Y 2017MNRAS.472.2963Y, Cat.
J/MNRAS/472/2963).
Pristine survey targets were cross-matched with the SDSS photometry to
obtain ugri broad-band magnitudes used for colour temperature
determinations and point-source identification. Additional selection
criteria were adopted, as described by Youakim et al.
(2017MNRAS.472.2963Y 2017MNRAS.472.2963Y, Cat. J/MNRAS/472/2963Y). The SDSS gri-band
photometry was further used for a colour selection, where
0.25<(g-i)0<1.5 and 0.15<(g-r)0<1.2 correspond to the temperature
range 4200K<Teff<6500K, covering the tip of the red giant branch and
the cooler main sequence to the main-sequence turn-off.
The 115 stars observed at CFHT with the high-resolution (R∼68000)
ESPaDOnS spectrograph (Donati et al. 2006ASPC..358..362D 2006ASPC..358..362D) are listed
in Table 1.
The kinematics and orbits for all 70 of the metal-poor candidates have
been determined using the Gaia DR2 data, our RVs, and adopting the
MWPotential14 in the Galpy package (with a slightly more massive
halo).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 104 115 Metal-poor targets (115) from the original
Pristine survey footprint
table2.dat 97 93 Gaia DR2 parallaxes, and the derived distances,
temperatures, and surface gravities from the
Bayesian inference method
table4.dat 123 29 Iron-group and heavy element abundances in the
new 28 metal-poor stars and our analysis of
HD122563
table5.dat 112 29 Light element abundances in the new 28
metal-poor stars and our analysis of HD122563
table6.dat 85 29 Total systematic errors per element species due
to the stellar parameters (T, logg, [Fe/H]),
added in quadrature
tablea1.dat 169 70 Orbit and Action parameters for the 70
metal-poor candidates from the Pristine survey
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right ascension (J2000) (G1)
10- 16 F7.4 deg DEdeg Declination (J2000) (G1)
18 A1 --- flag [abcd] Flag on the target (G2)
20- 24 F5.2 mag Vmag V magnitude converted from the SDSS photometry
26- 30 F5.2 mag Imag I magnitude converted from the SDSS photometry
32- 36 F5.3 mag E(B-V) Reddening from Schlegel, Finkbeiner & Davis
1998ApJ...500..525S 1998ApJ...500..525S
38- 43 F6.3 mag CaHKmag ? Dereddened Pristine CaHK magnitude
45- 50 F6.3 mag umag Dereddened SDSS u-band magnitude
52- 57 F6.3 mag gmag Dereddened SDSS g-band magnitude
59- 64 F6.3 mag rmag Dereddened SDSS r-band magnitude
66- 71 F6.3 mag imag Dereddened SDSS i-band magnitude
73- 78 F6.1 K Tsdss ? SDSS colour temperature
80- 83 F4.1 K e_Tsdss ? Error on Tsdss
85- 89 F5.2 [-] [Fe/H] Fe/H Pristine metallicity
91- 94 F4.2 [-] e_[Fe/H] ? Error on [Fe/H]
96-104 A9 --- Comment CFHT program label
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right ascension (J2000) (G1)
10- 17 F8.4 deg DEdeg Declination (J2000) (G1)
19 A1 --- flag [abcd] Flag on the target (G2)
21- 25 F5.2 mas plx Gaia DR2 parallax
27- 30 F4.2 mas e_plx Error on plx
32- 36 F5.2 kpc Dist Distance derived from the Bayesian inference
method
38- 41 F4.2 kpc e_Dist Error on Dist
43- 48 F6.1 K T Temperature derived from the Bayesian
inference method
50- 54 F5.1 K e_T Error on T
56- 59 F4.2 [cm/s2] logg Surface gravity derived from the Bayesian
inference method
61- 64 F4.2 [cm/s2] e_logg Error on logg
66- 71 F6.1 km/s RV Radial velocity (1)
73- 76 F4.2 km/s e_RV Error on RV
78- 81 F4.2 [-] logFeI ? FeI abundance from the 'Quick Six'
analysis
83- 87 F5.2 [-] logFeII FeII abundance from the 'Quick Six' analysis
89- 92 F4.2 [-] [Fe/H] Fe/H abundance ratio from the 'Quick Six'
analysis
94 I1 --- N Number of Fe lines used
96- 97 A2 --- Comment Comments (2)
--------------------------------------------------------------------------------
Note (1): Radial velocities were determined by fitting several strong lines per
star, and averaging the results from the individual lines together
Note (2): COmments as follows:
D2 = For four targets, a second distance satisfies the Bayesian inference
analysis but does not significantly affect the stellar parameters
dw = For four targets, a dwarf or giant solution has equal probability, this
line corresponds to the dwarf solution
di = For four targets, a dwarf or giant solution has equal probability, this
line corresponds to the giant solution
** = Stars no longer in the Pristine catalogue have been excluded since
they are not metal-poor targets, with only this star as exception
--------------------------------------------------------------------------------
Byte-by-byte Description of file:table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right ascension (J2000) (G1)
10- 16 F7.4 deg DEdeg Declination (J2000) (G1)
18- 25 A8 --- Name Star name (G3)
27- 31 F5.2 [-] [Fe/H] Fe/H abundance ratio (1)
33- 36 F4.2 [-] e_[Fe/H] Error on [Fe/H]
38- 41 F4.2 [-] logFeI FeI abundance
43- 46 F4.2 [-] e_logFeI Error on logFeI
48- 49 I2 --- o_logFeI Number of lines used to determine logFeI
51 A1 --- l_logFeII Limit flag on logFeII
53- 56 F4.2 [-] logFeII FeII abundance
58- 61 F4.2 [-] e_logFeII ? Error on logFeII
63 I1 --- o_logFeII ? Number of lines used to determine logFeII
65 A1 --- l_[Cr/Fe] Limit flag on [Cr/Fe]
67- 71 F5.2 [-] [Cr/Fe] ? Cr/Fe abundance ratio
73- 76 F4.2 [-] e_[Cr/Fe] ? Error on [Cr/Fe]
78 I1 --- o_[Cr/Fe] ? Number of lines used to determine [Cr/Fe]
80 A1 --- l_[Ni/Fe] Limit flag on [Ni/Fe]
82- 86 F5.2 [-] [Ni/Fe] ? Ni/Fe abundance ratio
88- 91 F4.2 [-] e_[Ni/Fe] ? Error on [Ni/Fe]
93 I1 --- o_[Ni/Fe] ? Number of lines used to determine [Ni/Fe]
95 A1 --- l_[Y/Fe] Limit flag on [Y/Fe]
97-101 F5.2 [-] [Y/Fe] Y/Fe abundance ratio
103-106 F4.2 [-] e_[Y/Fe] ? Error on Y/Fe
108 I1 --- o_[Y/Fe] ? Number of lines used to determine [Y/Fe]
110 A1 --- l_[Ba/Fe] Limit flag on [Ba/Fe]
112-116 F5.2 [-] [Ba/Fe] Ba/Fe abundance ratio
118-121 F4.2 [-] e_[Ba/Fe] ? Error on [Ba/Fe]
123 I1 --- o_[Ba/Fe] ? Number of lines used to determine [Ba/Fe]
--------------------------------------------------------------------------------
Note (1): [Fe/H] is the weighted mean of FeI and FeII
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right ascension (J2000) (G1)
10- 16 F7.4 deg DEdeg Declination (J2000) (G1)
18- 25 A8 --- Name Star name (G3)
27 A1 --- l_[Na/Fe] Limit flag on [Na/Fe]
29- 33 F5.2 [-] [Na/Fe] Na/Fe abundance ratio
35- 38 F4.2 [-] e_[Na/Fe] ? Error on [Na/Fe]
40 I1 --- o_[Na/Fe] ? Number of lines used to determine [Na/Fe]
42- 46 F5.2 [-] [Mg/Fe] Mg/Fe abundance ratio
48- 51 F4.2 [-] e_[Mg/Fe] Error on [Mg/Fe]
53 I1 --- o_[Mg/Fe] Number of lines used to determine [Mg/Fe]
55 A1 --- l_[Ca/Fe] Limit flag on [Ca/Fe]
57- 61 F5.2 [-] [Ca/Fe] ? Ca/Fe abundance ratio
63- 66 F4.2 [-] e_[Ca/Fe] ? Error on [Ca/Fe]
68 I1 --- o_[Ca/Fe] ? Number of lines used to determine [Ca/Fe]
70 A1 --- l_[Sc/Fe] Limit flag on [Sc/Fe]
72- 76 F5.2 [-] [Sc/Fe] ? Sc/Fe abundance ratio
78- 81 F4.2 [-] e_[Sc/Fe] ? Error on [Sc/Fe]
83 I1 --- o_[Sc/Fe] ? Number of lines used to determine [Sc/Fe]
85- 89 F5.2 [-] [TiI/Fe] ? TiI/Fe abundance ratio
91- 94 F4.2 [-] e_[TiI/Fe] ? Error on [TiI/Fe]
96 I1 --- o_[TiI/Fe] ? Number of lines used to determine [TiI/Fe]
98 A1 --- l_[TiII/Fe] Limit flag on [TiII/Fe]
100-104 F5.2 [-] [TiII/Fe] TiII/Fe abundance ratio
106-109 F4.2 [-] e_[TiII/Fe] ? Error on [TiII/Fe]
111-112 I2 --- o_[TiII/Fe] ? Number of lines used to determine [TiII/Fe]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right ascension (J2000) (G1)
10- 16 F7.4 deg DEdeg Declination (J2000) (G1)
18- 25 A8 --- Name Star Name (G3)
27- 30 F4.2 [-] dFeI Systematic error on FeI abundance
32- 35 F4.2 [-] dFeII ? Systematic error on FeII abundance
37- 40 F4.2 [-] dNa Systematic error on Na abundance
42- 45 F4.2 [-] dMg Systematic error on Mg abundance
47- 50 F4.2 [-] dCa ? Systematic error on Ca abundance
52- 55 F4.2 [-] dSc ? Systematic error on Sc abundance
57- 60 F4.2 [-] dTiI ? Systematic error on TiI abundance
62- 65 F4.2 [-] dTiII ? Systematic error on TiII abundance
67- 70 F4.2 [-] dCrI ? Systematic error on CrI abundance
72- 75 F4.2 [-] dNiI ? Systematic error on NiI abundance
77- 80 F4.2 [-] dYII ? Systematic error on YII abundance
82- 85 F4.2 [-] dBaII ? Systematic error on BaII abundance
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Right ascension (J2000) (G1)
10- 16 F7.4 deg DEdeg Declination (J2000) (G1)
18- 23 F6.2 mas/yr pmRA Proper motion in right ascension
25- 28 F4.2 mas/yr e_pmRA Error on pmRA
30- 35 F6.2 mas/yr pmDE Proper motion in declination
37- 40 F4.2 mas/yr e_pmDE Error on pmDE
42- 49 F8.3 km/s U U component of space velocity
51- 55 F5.2 km/s e_U Error on U
57- 63 F7.2 km/s V V component of space velocity
65- 69 F5.2 km/s e_V Error on V
71- 77 F7.2 km/s W W component of space velocity
79- 83 F5.2 km/s e_W Error on W
85- 90 F6.1 kpc Rapo Apocentric distance
92- 96 F5.1 kpc e_Rapo Error on Rapo
98-101 F4.1 kpc Rperi Pericentric distance
103-105 F3.1 kpc e_Rperi Error on Rperi
107-110 F4.2 --- ecc Eccentricity
112-115 F4.2 --- e_ecc Error on ecc
117-122 F6.1 kpc Zmax Perpendicular distance from the Galactic
plane
124-128 F5.1 kpc e_Zmax Error on Zmax
130-134 F5.2 Sun Jphi Azimuthal action parameter in solar units (1)
136-139 F4.2 Sun e_Jphi Error on Jphi
141-148 F8.2 Sun Jz Vertical action parameter in solar units (2)
150-155 F6.2 Sun e_Jz Error on Jz
157-162 F6.3 Sun E Orbital energy in solar units (3)
164-169 F6.3 Sun e_E [] Error on E
--------------------------------------------------------------------------------
Note (1): JΦ☉=2009.92kms-1kpc
Note (2): Jz☉=0.35kms-1kpc
Note (3): E☉=-64943.61(km/s)2
--------------------------------------------------------------------------------
Global Notes:
Note (G1): Coordinates from SDSS
Note (G2): Flag as follows:
a = High probability for [Fe/H]←2.5 in the Pristine catalogue
b = Used the SDSS-gr solution only for [Fe/H]←2.5 in the Pristine catalogue
c = Low probability for [Fe/H]←2.5 in the current Pristine catalogue
d = No longer in the Pristine catalogue
Note (G3): Positions for HD122563 were added here and taken from Simbad
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Starkenburg et al., Paper I 2017MNRAS.471.2587S 2017MNRAS.471.2587S
Caffau et al., Paper II 2017AN....338..686C 2017AN....338..686C, Cat. J/AN/338/686
Youakim et al., Paper III 2017MNRAS.472.2963Y 2017MNRAS.472.2963Y, Cat. J/MNRAS/472/2963
Starkenburg et al., Paper IV 2018MNRAS.481.3838S 2018MNRAS.481.3838S
Bonifacio et al., Paper V 2019MNRAS.487.3797B 2019MNRAS.487.3797B, Cat. J/MNRAS/487/3797
Aguado et al., Paper VI 2019MNRAS.490.2241A 2019MNRAS.490.2241A, Cat. J/MNRAS/490/2241
Starkenburg et al., Paper VII 2019MNRAS.490.5757S 2019MNRAS.490.5757S
Youakim et al., Paper VIII 2020MNRAS.492.4986Y 2020MNRAS.492.4986Y
Venn et al., Paper IX 2020MNRAS.492.3241V 2020MNRAS.492.3241V
Sestito et al., Paper X 2020MNRAS.497L...7S 2020MNRAS.497L...7S
Caffau et al., Paper XI 2020MNRAS.493.4677C 2020MNRAS.493.4677C
Kielty et al., Paper XII 2021MNRAS.506.1438K 2021MNRAS.506.1438K
Fernandez-Alvar et al., Paper XIII 2021MNRAS.508.1509F 2021MNRAS.508.1509F
Lardo et al., Paper XIV 2021MNRAS.508.3068L 2021MNRAS.508.3068L
Lucchesi et al., Paper XV 2022MNRAS.511.1004L 2022MNRAS.511.1004L
Martin et al., Paper XVI 2022MNRAS.516.5331M 2022MNRAS.516.5331M
Yuan et al., Paper XVII 2022MNRAS.514.1664Y 2022MNRAS.514.1664Y
Errani et al., Paper XVIII 2022MNRAS.514.3532E 2022MNRAS.514.3532E
Caffau et al., Paper XIX 2023MNRAS.518.3796C 2023MNRAS.518.3796C
Arentsen et al., Paper XX 2023MNRAS.519.5554A 2023MNRAS.519.5554A, Cat. J/MNRAS/519/5554
(End) Ana Fiallos [CDS] 23-Mar-2023