J/ApJ/920/94 Chemical abundances in binary stars (Espinoza-Rojas+, 2021)
The Consistency of Chemical Clocks among Coeval Stars.
Espinoza-Rojas F.,Chaname J.,Jofre P.,Casamiquela L.
<Astrophys. J., 920, 94 (2021)>
=2021ApJ...920...94E 2021ApJ...920...94E
ADC_Keywords: Stars, double and multiple; Spectra, optical; Abundances
Keywords: Binary stars ; Spectroscopy ; Chemical abundances ; Galaxy
chemical evolution ; Solar neighborhood ; Solar analogs
Abstract:
The abundance ratios of some chemical species have been found to
correlate with stellar age, leading to the possibility of using
stellar atmospheric abundances as stellar age indicators. These
chemical clocks have already been calibrated with solar twins and open
clusters, but it remains to be seen whether they can be effective at
identifying coeval stars in a population that spans a broad parameter
space (i.e., the promise of chemical tagging). Since the components of
wide binaries are known to be stars of common origins, they constitute
ideal laboratories for testing the usefulness of chemical clocks for
the age dating of field stars. Using a combination of our new
measurements and literature data on wide binaries, we show for the
first time that chemical clocks are even more consistent among the
components of wide binaries than their individual abundances.
Moreover, the special case of HIP 34426/HIP 34407 may indicate that
chemical clocks are consistent for coeval stars even when those
individual abundances are not. If the assumption that chemical clocks
are reliable age indicators is correct, this would constitute the
first statistically significant evidence that the components of wide
binaries are indeed coeval, validating a large body of published work
that relies on that to be the case. Furthermore, our results provide
strong evidence that chemical clocks indeed carry important
information about stellar birthplaces and chemical evolution, and thus
we propose that including them in chemical tagging efforts may
facilitate the identification of now-dissolved stellar groups.
Description:
Observations took place between 2011 September and 2012 January 4 with
the high-resolution Magellan Inamori Kyocera Echelle (MIKE)
spectrograph on the 6.5m Magellan Clay telescope located at Las
Campanas Observatory. It has a resolution of R∼65000 for the red and
R∼85000 for the blue orders. The observations were carried out using a
slit of 0.35x5.00" and a binning of 1x1. In addition, we considered a
solar spectrum taken from VESTA, also observed in that period.
The spectra cover a range of 3380-9370Å and have a signal-to-noise
ratio above 250.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 251 72 Catalog
tablea2.dat 108 238 Atomic data and equivalent widths of linelist used
to derive stellar parameters
tablea3.dat 108 501 Atomic data and equivalent widths of linelist used
to derive abundances
refs.dat 143 65 References used for tablea2 and tablea3
--------------------------------------------------------------------------------
See also:
J/ApJS/150/455 : New HIP-based parallaxes for 424 faint stars (Gould+, 2004)
J/A+A/441/1149 : Abundances of 20 F-G disk stars (del Peloso+, 2005)
J/A+A/454/581 : Iron abundances of 33 wide binaries (Desidera+, 2006)
J/ApJ/704/531 : The coevality of young binary systems (Kraus+, 2009)
J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)
J/A+A/577/A9 : Sc, V, Mn, and Co in Milky Way stars (Battistini+, 2015)
J/A+A/582/A81 : Gaia FGK benchmark stars; abundances (Jofre+, 2015)
J/ApJ/808/13 : XO-2S and XO-2N chemical composition (Ramirez+, 2015)
J/ApJ/801/L10 : XO-2N and XO-2S equivalent widths (Teske+, 2015)
J/A+A/591/A34 : Chemical abundances of zeta Reticuly (Adibekyan+, 2016)
J/A+A/588/A81 : Line list and abundances of the binary zet2 Ret (Saffe+, 2016)
J/ApJ/819/19 : Equivalent widths of WASP-94A and WASP-94B (Teske+, 2016)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/A+A/604/L4 : HAT-P-4 & TYC 2569-744-1 abundances and spectra (Saffe+, 2017)
J/MNRAS/473/5393 : Wide binaries in Tycho-Gaia (Andrews+, 2018)
J/ApJ/865/68 : Abundances for 79 Sun-like stars within 100pc (Bedell+, 2018)
J/AJ/156/126 : Stellar parameters & abund. from BACCHUS (Jonsson+, 2018)
J/A+A/614/A138 : HD 80606/80607 equivalent widths (Lui+, 2018)
J/A+A/624/A78 : Masses and ages of 1059 HARPS-GTO stars (Delgado Mena+, 2019)
J/A+A/631/A171 : Neutron-capture elementsdwarf galaxies (Skuladottir+, 2019)
J/A+A/639/A127 : Age-chemical-clocks-metallicity relations (Casali+, 2020)
J/A+A/635/A8 : Differential abundances of open clusters (Casamiquela+, 2020)
J/MNRAS/492/1164 : Abundances of Gaia DR2 wide binaries (Hawkins+, 2020)
J/A+A/633/L9 : Linear regression fit coefficients (Jofre+, 2020)
J/A+A/640/A81 : Abundances of 72 solar-type stars (Nissen+, 2020)
J/A+A/652/A25 : Abundance-age relations with open cluster (Casamiquela+, 2021)
J/A+A/645/A106 : Atomic data for the Gaia-ESO Survey (Heiter+, 2021)
J/MNRAS/502/32 : Evolutionary traits for stellar phylogenie (Jackson+, 2021)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Name Name of the star
16- 58 A43 --- Ref Paper reference where data were taken from
60- 84 A25 --- Inst Spectrograph used to obtained the data
86- 93 A8 nm SpRange Spectral range of instrument used
95- 98 I4 K Teff [4946/6682] Effective temperature
100-102 I3 K e_Teff [5/129] Uncertainty in Teff
104-107 F4.2 [cm/s2] logg [3.79/4.83] Surface gravity
109-112 F4.2 [cm/s2] e_logg [0.01/0.9] Uncertainty in logg
114-118 F5.2 [Sun] [Fe/H] [-1.43/0.41] Metallicity
120-123 F4.2 [Sun] e_[Fe/H] [0/0.03] Uncertainty in [Fe/H]
125-128 F4.2 km/s Vmic [0.7/2.03] Microturbulence velocity
130-134 F5.3 km/s e_Vmic [0.008/0.2] Uncertainty in Vmic
136-143 F8.2 AU Sep [354/29771]? Projected physical separation
145-151 F7.3 deg RAdeg [24/314] Right ascension (ICRS) at Ep=2015.5
153-157 F5.3 deg e_RAdeg [0.007/0.1] Uncertainty in RAdeg
159-165 F7.3 deg DEdeg [-63/64] Declination (ICRS) at Ep=2015.5
167-171 F5.3 deg e_DEdeg [0.009/0.1] Uncertainty in DEdeg
173-178 F6.3 mas plx [3.07/83.1] Gaia DR2 parallax
180-184 F5.3 mas e_plx [0.01/0.2] Uncertainty in plx
186-194 F9.3 mas/yr pmRA [-1001/1338] Gaia DR2 Proper motion in RA
direction
196-200 F5.3 mas/yr e_pmRA [0.01/0.2] Standard error in pmRA
202-210 F9.3 mas/yr pmDE [-3543/650] Gaia DR2 Proper motion in DE
direction
212-216 F5.3 mas/yr e_pmDE [0.008/0.2] Standard error in pmDE
218-224 F7.3 km/s RVel [-40.8/312]? Gaia DR2 Spectroscopic
barycentric radial velocity
226-230 F5.3 km/s e_RVel [0.1/1]? Standard error in RVel
232-237 F6.3 mag Gmag [5.08/11.5] Gaia DR2 G-band mean Vega
magnitude
239-244 F6.3 mag BPmag [5.38/11.8] Integrated Gaia DR2 BP mean
magnitude
246-251 F6.3 mag RPmag [4.59/11] Integrated Gaia DR2 RP mean
magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea[23].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Ion Element identifier
6- 13 F8.3 0.1nm Wave Wavelength; Angstroms
15- 20 F6.3 [-] loggf log oscillator strength
22- 26 F5.3 eV ExPot Excitation potential
28- 38 A11 --- Ref Reference code
40- 45 F6.2 10-13m HIP15304 ? HIP15304 equivalent width; mÅ
47- 52 F6.2 10-13m HIP15310 ? HIP15310 equivalent width; mÅ
54- 59 F6.2 10-13m HIP32865 ? HIP32865 equivalent width; mÅ
61- 66 F6.2 10-13m HIP32871 ? HIP32871 equivalent width; mÅ
68- 73 F6.2 10-13m HIP34407 ? HIP34407 equivalent width; mÅ
75- 80 F6.2 10-13m HIP34426 ? HIP34426 equivalent width; mÅ
82- 87 F6.2 10-13m HIP52792 ? HIP52792 equivalent width; mÅ
89- 94 F6.2 10-13m HIP52793 ? HIP52793 equivalent width; mÅ
96-101 F6.2 10-13m HIP58240 ? HIP58240 equivalent width; mÅ
103-108 F6.2 10-13m HIP58241 ? HIP58241 equivalent width; mÅ
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Ref Reference code
12- 30 A19 --- BIB BIBcode of the reference
32- 47 A16 --- Cat. Vizier catalog
49-143 A95 --- Note Additional note or comment
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Feb-2023