J/MNRAS/451/4368 Lithium abundance of solar-like stars (Lopez-Valdivia+, 2015)
Lithium abundance in a sample of solar-like stars.
Lopez-Valdivia R., Hernandez-Aguila J.B., Bertone E., Chavez M.,
Cruz-Saenz de Miera F., Amazo-Gomez E.M.
<Mon. Not. R. Astron. Soc., 451, 4368-4374 (2015)>
=2015MNRAS.451.4368L 2015MNRAS.451.4368L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Abundances ; Spectral types ;
Effective temperatures ; Equivalent widths
Keywords: techniques: spectroscopic - stars: abundances - stars: solar-type
Abstract:
We report on the determination of the lithium abundance [A(Li)] of
52 solar-like stars. For 41 objects the A(Li) here presented corresponds
to the first measurement. We have measured the equivalent widths of
the 6708 Å lithium feature in high-resolution spectroscopic images
(R∼80000), obtained at the Observatorio Astrofisico Guillermo Haro
(Sonora, Mexico), as part of the first scientific observations of the
revitalized Lunar and Planetary Laboratory (LPL) Echelle Spectrograph,
now known as the Cananea High-resolution Spectrograph (CanHiS). Lithium
abundances were derived with the Fortran code MOOG, using as fundamental
input a set of atmospheric parameters recently obtained by our group.
With the help of an additional small sample with previous A(Li)
determinations, we demonstrate that our lithium abundances are in
agreement, to within uncertainties, with other works. Two target objects
stand out from the rest of the sample. The star BD+47 3218
(Teff=6050±52 K, A(Li)=1.86±0.07 dex) lies inside the so-called
lithium desert in the A(Li)-Teff plane. The other object, BD+28 4515,
has an A(Li)=3.05±0.07 dex, which is the highest of our sample and
compatible with the expected abundances of relatively young stars.
Description:
The spectroscopic data were collected at the 2.1 metre telescope of
the Observatorio Astrofisico Guillermo Haro, located in Mexico, using
the Cananea High-resolution Spectrograph (CanHiS), as part of the first
scientific observations of this instrument, at this facility. CanHiS
is equipped with filters, that provide access to ∼40 Å-wide wavelength
intervals in single diffraction orders. Our observations were centred
at 6710 Å, with a spectral resolving power of R∼80000 and a typical
signal-to-noise ratio (S/N) of about 100.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 52 Physical parameters and Li abundance of
the stellar sample
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See also:
J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011)
J/MNRAS/444/2251 : G0-G3 main-sequence stars with V<15 (Lopez-Valdivia+, 2014)
J/ApJ/865/68 : Abundances for 79 Sun-like stars within 100pc
(Bedell+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Star Star identification
17 A1 --- f_Star [a] Flag indicating star with previous
determination of A(Li)
19- 23 F5.2 mag Vmag [5.88/10.74] V band magnitude
25- 30 A6 --- SpType Spectral type
32- 35 I4 K Teff [5357/6220] Effective temperature
37- 39 I3 K e_Teff [35/204] Uncertainty in Teff
41- 44 F4.2 [cm/s2] logg [3.15/4.85] Surface gravity (dex)
46- 49 F4.2 [cm/s2] e_logg [0.17/0.4]? Uncertainty in logg (dex)
51- 55 F5.2 [-] [M/H] [-0.34/0.28] Global metallicity (dex)
57- 60 F4.2 [-] e_[M/H] [0.03/0.14]? Uncertainty in [M/H] (dex)
62 A1 --- l_EW(Li) [<] Limit flag on EW(Li)
63- 67 F5.1 0.1pm EW(Li) [3.6/146] 6708Å Li line equivalent width
(mÅ)
69- 72 F4.1 0.1pm e_EW(Li) [0.3/10]? Uncertainty in EW(Li) (mÅ)
74 A1 --- l_A(Li) [<] Limit flag on A(Li)
75- 79 F5.2 --- A(Li) [0.79/3.05] Lithium abundance (dex)
81- 84 F4.2 --- e_A(Li) [0.04/0.13]? Uncertainty in A(Li) (dex)
86 A1 --- Source [CL] Source of stellar parameters (1)
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Note (1): Source as follows:
C = Casagrande et al. (2011, J/A+A/530/A138);
L = Lopez-Valdivia et al. (2014, J/MNRAS/444/2251).
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 04-Dec-2019