J/AJ/159/90 Li, C and O abundances of FGK stars (Stonkute+, 2020)
High-resolution spectroscopic study of dwarf stars in the northern sky: lithium,
carbon, and oxygen abundances.
Stonkute E., Chorniy Y., Tautvaisiene G., Drazdauskas A., Minkeviciute R.,
Mikolaitis S., Kjeldsen H., von Essen C., Pakstiene E., Bagdonas V.
<Astron. J., 159, 90 (2020)>
=2020AJ....159...90S 2020AJ....159...90S
ADC_Keywords: Abundances; Spectra, optical; Rotational velocities; Exoplanets;
Stars, F-type; Stars, G-type; Stars, K-type;
Stars, ages; Stars, dwarfs; Stars, masses
Keywords: Chemical abundances ; Dwarf stars ; Solar neighborhood ;
High resolution spectroscopy
Abstract:
Abundances of lithium, carbon, and oxygen have been derived using
spectral synthesis for a sample of 249 bright F, G, and K Northern
Hemisphere dwarf stars from the high-resolution spectra acquired with
the Vilnius University Echelle Spectrograph (VUES) at the Moletai
Astronomical Observatory of Vilnius University. The sample stars have
metallicities, effective temperatures, and ages between -0.7-0.4dex,
5000-6900K, 1-12Gyr, accordingly. We confirm a so far unexplained
lithium abundance decrease at supersolar metallicities --A(Li) in our
sample stars, which drop by 0.7dex in the [Fe/H] range from +0.10 to
+0.55dex. Furthermore, we identified stars with similar ages,
atmospheric parameters, and rotational velocities, but with
significantly different lithium abundances, which suggests that
additional specific evolutionary factors should be taken into account
while interpreting the stellar lithium content. Nine stars with
predominantly supersolar metallicities, i.e., about 12% among 78 stars
with C and O abundances determined, have the C/O number ratios larger
than 0.65, thus may form carbon-rich rocky planets. Ten planet-hosting
stars, available in our sample, do not show a discernible difference
from the stars with no planets detected regarding their lithium
content.
Description:
This work is based on spectroscopic data from the Spectroscopic and
Photometric Survey of the Northern Sky (SPFOT) project
Mikolaitis+ (2018PASP..130g4202M 2018PASP..130g4202M & 2019, J/A+A/628/A49).
Spectral observations were carried out with the 1.65m telescope at the
Moletai astronomical observatory of Vilnius University in Lithuania
and the high-resolution Vilnius University Echelle Spectrograph (VUES)
covering a wavelength range from 4000 to 9000Å. From this survey,
we took a data set consisting of 249 F, G, and K spectral type dwarf
and subgiant stars observed in 2017-2018.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 102 249 Abundances of Li, C, and O, atmospheric and other
parameters of the sample stars
table4.dat 48 13 The dwarf stars with similar main parameters but
different lithium abundances
table5.dat 121 14 *Stars of our sample with confirmed exoplanets
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Note on table5.dat: Data were taken from NASA Exoplanet Archive (NED)
on 2019 July 31; except for the abundances.
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See also:
I/259 : The Tycho-2 Catalogue (Hog+, 2000)
V/136 : Teff and metallicities for Tycho-2 stars (Ammons+, 2006)
J/A+AS/141/371 : Low-mass stars evolution tracks & isochrones (Girardi+,2000)
J/MNRAS/349/757 : Masses, ages and metallicities of F-G dwarfs (Lambert+,2004)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/A+A/503/541 : Li in late-type stars non-LTE calculations (Lind+, 2009)
J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+,2010)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/ApJ/725/2349 : C/O vs Mg/Si of planetary systems (Delgado Mena+, 2010)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/ApJ/735/41 : Carbon and oxygen abundances in FGK stars (Petigura+, 2011)
J/ApJ/732/55 : Abundances of stars with planets (Schuler+, 2011)
J/A+A/547/A106 : Li abundances in the FGK dwarfs (Mishenina+, 2012)
J/ApJ/756/46 : Lithium abundances in HIP stars (Ramirez+, 2012)
J/A+A/562/A92 : Li abundance in solar analogues (Delgado Mena+, 2014)
J/A+A/568/A25 : C and O abundances in stellar populations (Nissen+, 2014)
J/A+A/580/A24 : Abundances in dwarfs, subgiants, and giants (da Silva+,2015)
J/A+A/576/A69 : Li abundances in F stars (Delgado Mena+, 2015)
J/MNRAS/451/4368 : Lithium abundance of solar-like stars (Lopez-Valdivia+,2015)
J/ApJ/831/20 : C/O and Mg/Si for solar neighborhood's stars (Brewer+, 2016)
J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)
J/A+A/595/A18 : Lithium abundances in AMBRE stars (Guiglion+, 2016)
J/AJ/153/21 : Abundances in region. II. F, G, & K dwarfs (Luck+, 2017)
J/A+A/599/A96 : Chemical abundances of 1110 stars (Suarez-Andres+, 2017)
J/A+A/619/A130 : Solar sibling candidates abundances (Adibekyan+, 2018)
J/A+A/614/A55 : Li abundance in dwarfs & subgiants (Aguilera-Gomez+, 2018)
J/ApJ/865/68 : Abundances for 79 Sun-like stars within 100pc (Bedell+,2018)
J/A+A/615/A151 : Lithium abundances in 714 F and G dwarf stars (Bensby+,2018)
J/A+A/610/A38 : Li enrichment histories of the thick/thin disc (Fu+, 2018)
J/AJ/155/111 : Abundances in local region. III. Southern dwarfs (Luck,2018)
J/AJ/156/171 : Cepheid abundances (Luck, 2018)
J/A+A/614/A84 : C/O vs Mg/Si ratios solar type stars (Suarez-Andres+, 2018)
J/A+A/628/A49 : Spectroscopy of dwarf stars (Mikolaitis+, 2019)
J/A+A/621/A112 : Carbon and oxygen in 107 dwarf stars (Pavlenko+, 2019)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [TYC]
4- 14 A11 --- TYC Star name
16- 19 F4.2 [-] A(Li) [0/3.2] Li abundance
21- 21 A1 --- f_A(Li) [MU] Flag on A(Li): M=measurable;
U=upper limit
23- 27 F5.2 km/s vsini [0/25] Rotational velocity
29- 33 F5.2 [-] [C/H] [-0.52/0.4]? Carbon-to-hydrogen ratio
35- 38 F4.2 [-] e_[C/H] [0.03/0.1]? Error on [C/H]
40- 40 I1 --- o_[C/H] [1/2]? Number of C-lines
42- 46 F5.2 [-] [O/H] [-0.25/0.4]? Oxygen-to-hydrogen ratio
48- 51 F4.2 [-] e_[O/H] [0.03/0.15]? Error on [O/H]
53- 53 I1 --- o_[O/H] [1]? Number of O-lines
55- 58 F4.2 --- C/O [0.2/0.8]? Carbon-to-oxygen number ratio
60- 60 I1 --- Disk [0/1] 0=Thin-disk star, 1=Thick-disk
62- 62 I1 --- Pl [0/1] 1=Have any planet, 0=Have not
64- 67 I4 K Teff [4696/6947] Effective temperature
69- 71 I3 K e_Teff [21/164] Error on effective temperature
73- 76 F4.2 [cm/s2] logg [3.43/4.69] Surface gravity
78- 81 F4.2 [cm/s2] e_logg [0.1/0.54] Error on surface gravity
83- 87 F5.2 [-] [Fe/H] [-0.69/0.45] Metallicity
89- 92 F4.2 [-] e_[Fe/H] [0.01/0.2] Error on metallicity
94- 97 F4.2 km/s Vt [0.24/2.1] Microturbulence velocity
99-102 F4.2 km/s e_Vt [0.1/0.4] Error on microturbulence velocity
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [TYC]
4- 14 A11 --- TYC Star name
16- 19 I4 K Teff [5691/6544] Effective temperature
21- 23 F3.1 [cm/s2] logg [3.8/4.4] Log of surface gravity
25- 29 F5.2 [-] [Fe/H] [-0.23/0.28] Metallicity
31- 34 F4.2 km/s Vt [0.77/1.83] Microturbulence velocity
36- 39 F4.1 km/s vsini [0.1/25] Rotational velocity
41- 43 F3.1 Gyr Age [1.6/6.6] Age
45- 48 F4.2 [-] A(Li) [1.05/3.2] Li abundance
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [TYC]
4- 14 A11 --- TYC Star name
16- 28 A13 --- Name Planet name
30- 33 F4.2 Mjup Mp [0.02/9.1] Planet mass
36- 42 F7.5 Mjup e_Mp [0/2.51]? Negative error on Mp
45- 51 F7.5 Mjup E_Mp [0/2.51]? Positive error on Mp
53- 56 F4.2 au a [0.06/6.7] Semi major axis
59- 64 F6.4 au e_a [0/1.4]? Negative error on a
67- 72 F6.4 au E_a [0/4]? Positive error on a
74- 80 F7.2 d Per [5.4/5894] Orbital period
83- 92 F10.5 d e_Per [0.0002/1498] Negative error on Per
95-104 F10.5 d E_Per [0.0002/5584] Positive error on Per
106-109 F4.2 [-] A(Li) [0.05/2.8]? Host star Li abundance
111 A1 --- f_A(Li) [a] Flag on A(Li); a=upper limit
113-116 F4.2 --- C/O [0.26/0.6]? Host star carbon-to-oxygen ratio
118-121 F4.2 --- Mg/Si [0.95/1.6]? Host star magnesium-to-silicium ratio
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History:
From electronic version of the journal
References:
Mikolaitis et al. Paper I. 2018PASP..130g4202M 2018PASP..130g4202M
Mikolaitis et al. Paper II. 2019A&A...628A..49M 2019A&A...628A..49M cat. J/A+A/628/A49
(End) Prerpared by [AAS], Coralie Fix [CDS], 20-Apr-2020