J/ApJ/756/46 Lithium abundances in HIP stars (Ramirez+, 2012)
Lithium abundances in nearby FGK dwarf and subgiant stars: internal destruction,
Galactic chemical evolution, and exoplanets.
Ramirez I., Fish J.R., Lambert D.L., Allende Prieto C.
<Astrophys. J., 756, 46 (2012)>
=2012ApJ...756...46R 2012ApJ...756...46R
ADC_Keywords: Abundances ; Stars, G-type ; Stars, masses ; Stars, ages ;
Stars, nearby ; Planets
Keywords: planetary systems; stars: abundances; stars: evolution
Abstract:
We derive atmospheric parameters and lithium abundances for 671 stars
and include our measurements in a literature compilation of 1381 dwarf
and subgiant stars. First, a "lithium desert" in the effective
temperature (Teff) versus lithium abundance (ALi) plane is
observed such that no stars with Teff≃6075K and ALi≃1.8 are
found. We speculate that most of the stars on the low ALi side of
the desert have experienced a short-lived period of severe surface
lithium destruction as main-sequence or subgiant stars. Next, we
search for differences in the lithium content of thin-disk and
thick-disk stars, but we find that internal processes have erased from
the stellar photospheres their possibly different histories of lithium
enrichment. Nevertheless, we note that the maximum lithium abundance
of thick-disk stars is nearly constant from [Fe/H]=-1.0 to -0.1, at a
value that is similar to that measured in very metal-poor halo stars
(ALi≃2.2). Finally, differences in the lithium abundance
distribution of known planet-host stars relative to otherwise ordinary
stars appear when restricting the samples to narrow ranges of Teff
or mass, but they are fully explained by age and metallicity biases.
We confirm the lack of a connection between low lithium abundance and
planets. However, we find that no low ALi planet-hosts are found in
the desert Teff window. Provided that subtle sample biases are not
responsible for this observation, this suggests that the presence of
gas giant planets inhibit the mechanism responsible for the lithium
desert.
Description:
The data set analyzed in this work consists of about 700
high-resolution (R≳45000), high signal-to-noise ratio (S/N≳100)
spectra of 671 nearby (d<200pc) FGK dwarf and subgiant stars taken
from the study of Ramirez et al. (2013, Cat. J/ApJ/764/78).
Most of the spectra were taken by us using the Tull coude spectrograph
on the 2.7m Harlan J. Smith Telescope at McDonald Observatory. We also
used FGK stars' spectra from the online UVES-VLT library by Bagnulo et
al. (2003Msngr.114...10B 2003Msngr.114...10B) and the library of spectra of nearby stars
-the Spectroscopic Survey of Stars in the Solar Neighborhood, S4N-
by Allende Prieto et al. (2004, Cat. J/A+A/420/183), taken from both
the Smith Telescope at McDonald Observatory and ESO's 1.5m Telescope
at La Silla.
We determined the lithium abundance using spectral line-profile
fitting of the region near the lithium resonance doublet at 6708Å,
as in Baumann et al. (2010A&A...519A..87B 2010A&A...519A..87B).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 671 Stellar parameters and Lithium abundances
determined in this work
table3.dat 124 1381 Catalog of stellar parameters and Lithium abundances
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See also:
J/A+A/562/A92 : Solar stars with exoplanets Li depletion (Delgado Mena+, 2014)
J/A+A/554/A96 : Spectra of LiI(670.8nm) line in metal-poor stars (Lind+, 2013)
J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)
J/PASP/124/164 : New Li measurements in metal-poor stars (Schaeuble+, 2012)
J/ApJ/724/154 : Lithium abundances in stars with planets (Ghezzi+, 2010)
J/MNRAS/403/1368 : Li abundances for star-planet systems (Gonzalez+, 2010)
J/A+A/515/A93 : Li abundances in solar-analog stars. II. (Takeda+, 2010)
J/A+A/493/601 : Lithium abundances of halo dwarfs (Hosford+, 2009)
J/A+A/468/663 : Li abundances in solar-analog stars (Takeda+, 2007)
J/A+A/465/271 : Oxygen abundances in nearby stars (Ramirez+, 2007)
J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005)
J/A+A/442/961 : Li content of the Galactic Halo stars (Charbonnel+, 2005)
J/MNRAS/349/757 : Masses, ages and metallicities of F-G dwarfs (Lambert+, 2004)
J/A+A/409/251 : Li abundances and velocities in F and G stars (Mallik+, 2003)
J/A+A/371/943 : Lithium abundances for 185 main-sequence stars (Chen+, 2001)
J/A+A/363/239 : Lithium abundances in single giant stars (De Medeiros+, 2000)
J/A+A/352/117 : Galactic lithium evolution revisited (Romano+, 1999)
J/AJ/105/2299 : Li abundance of solar-type stars. II. (Soderblom+, 1993)
J/MNRAS/253/610 : Li abundances for 81 F dwarfs (Lambert+, 1991)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HIP HIP number
7 A1 --- m_HIP [AB] Multiplicity index on HIP number
9- 12 I4 K Teff [4600/6989] Effective temperature
14- 16 I3 K e_Teff [22/115] Uncertainty in Teff
18- 21 F4.2 [cm/s2] log(g) [3.5/4.7] Log of the surface gravity
23- 26 F4.2 [cm/s2] e_log(g) [0/0.3] Uncertainty in log(g)
28- 32 F5.2 [-] [Fe/H] [-2.3/0.4] Metallicity
34- 37 F4.2 [-] e_[Fe/H] [0.02/0.3] Uncertainty in [Fe/H]
39- 39 A1 --- l_ALi Limit flag on ALi
41- 45 F5.2 --- ALi [-0.3/3.4] Lithium abundance
47- 50 F4.2 --- e_ALi [0.01/0.2]? Uncertainty in ALi
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
7 A1 --- m_HIP [AB] Multiplicity index on HIP number
9- 12 I4 K Teff [4149/7090] Effective temperature
14- 16 I3 K e_Teff [50/140] Uncertainty in Teff
18- 21 F4.2 [cm/s2] log(g) [3.4/4.8]?=9.99 Log of the surface gravity
23- 26 F4.2 [cm/s2] e_log(g) [0/0.5] Uncertainty in log(g)
28- 32 F5.2 [-] [Fe/H] [-2.3/0.7] Metallicity
34- 37 F4.2 [-] e_[Fe/H] [0.04/0.4] Uncertainty in [Fe/H]
39 A1 --- l_ALi Limit flag on ALi
41- 45 F5.2 --- ALi [-1.1/3.8] Lithium abundance
47- 50 F4.2 --- e_ALi [0/0.9]? Uncertainty in ALi
52- 55 F4.2 Msun M [0.5/2.1]?=0 Star mass
57- 60 F4.2 Msun E_M ?=0 Upper limit uncertainty in M
62- 65 F4.2 Msun e_M ?=0 Lower limit uncertainty in M
67- 71 F5.2 Gyr Age [0.1/14.6]? Star age
73- 76 F4.2 Gyr E_Age [0/8]? Upper limit uncertainty in Age
78- 81 F4.2 Gyr e_Age [0/9]? Lower limit uncertainty in Age
83- 85 A3 --- n_Age Age determination method: iso=isochrones,
rot=rotation.
87- 91 A5 --- Pop Population type (1)
93- 95 A3 --- Pl? [yes/no ] Known planet-host?
97-124 A28 --- Source Reference(s) (2)
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Note (1): Population: thin-disk, thick-disk, or halo, according to the
star's kinematics. If not available, the kinematic criterion adopted
in this work implies an ambiguous or unreliable association.
Note (2): Reference as follows :
TW = This Work;
B10 = Baumann et al. (2010A&A...519A..87B 2010A&A...519A..87B);
G10 = Gonzalez et al. (2010, Cat. J/MNRAS/403/1368);
I09 = Israelian et al. (2009Natur.462..189I 2009Natur.462..189I);
LH06 = Luck & Heiter (2006AJ....131.3069L 2006AJ....131.3069L);
T10 = Takeda et al. (2010, Cat. J/A+A/515/A93);
Gh10 = Ghezzi et al. (2010, Cat. J/ApJ/724/154);
LR04 = Lambert & Reddy (2004, Cat. J/MNRAS/349/757).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Mar-2014