J/A+A/489/923 Abundances of stars in lower main sequence (Mishenina+, 2008)
Spectroscopic investigation of stars on the lower main sequence.
Mishenina T.V., Soubiran C., Bienayme O., Korotin S.A., Belik S.I.,
Usenko I.A., Kovtyukh V.V.
<Astron. Astrophys., 489, 923-930 (2008)>
=2008A&A...489..923M 2008A&A...489..923M
ADC_Keywords: Stars, late-type ; Abundances
Keywords: stars: fundamental parameters - stars: abundances - stars: late-type
Abstract:
The aim of this paper is to provide fundamental parameters and
abundances with a high accuracy for a large sample of cool main
sequence stars. This study is part of wider project, in which the
metallicity distribution of the local thin disc is investigated from a
complete sample of G and K dwarfs within 25pc.
The stars were observed at high resolution and a high signal-to-noise
ratio with the ELODIE echelle spectrograph. The Vsini were obtained
with a calibration of the cross-correlation function. Effective
temperatures were estimated by the line depth ratio method. Surface
gravities (logg) were determined by two methods: parallaxes and
ionization balance of iron. The Mg and Na abundances were derived
using a non-LTE approximation. Abundances of other elements were
obtained by measuring equivalent widths. Rotational velocities,
atmospheric parameters Teff, logg, [Fe/H], Vt, and Li, O, Na, Mg, Al,
Si, Ca, Sc, Ti, V, Cr, Co, Ni, and Zn abundances are provided for 131
stars.
Among them, more than 30 stars are active stars with a fraction of BY
Dra and RS CVn type stars for which spectral peculiarities were
investigated. We find the mean abundances of the majority of elements
in active and non-active stars to be similar, except for Li, and
possibly for Zn and Co. The lithium is reliably detected in 54% of
active stars but only in 20% of non -active stars. No correlation is
found between Li abundances and rotational velocities. A possible
anticorrelation of log A(Li) with the index of chromospheric activity
GrandS is observed. Active and non active cool dwarfs show similar
dependencies of most elemental ratios vs [Fe/H]. This allows us to use
such abundance ratios to study the chemical and dynamical evolution of
the Galaxy. Among active stars, no clear correlation has been found
between different indicators of activity for our sample stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 70 131 The basic characteristics of studied stars
tablea2.dat 75 131 The abundances of Li, O, Na, Mg, Al, Si, Ca, and
S c in atmospheres of studied stars
tablea3.dat 59 131 The abundances of Ti, V, Cr, Co, Ni, and Zn in
atmospheres of studied stars
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See also:
III/251 : ELODIE library V3.1 (Prugniel+ 2007)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- HD/BD HD/BD name
12- 15 F4.2 mag Vmag V magnitude
18- 21 F4.2 mag Mbol Bolometric absolute magnitude
24- 28 F5.2 km/s vsini ?=- Rotation velocity
32- 35 I4 K Teff Mean effective temperature of the star
38- 41 F4.1 K e_Teff rms uncertainty on Teff (standard error of
the mean)
45- 48 F4.2 [cm/s2] logg Surface gravity determined using parallaxes
52- 55 F4.2 [cm/s2] loggIE ?=- Surface gravity determined using
ionization balance of iron
59- 63 F5.2 [Sun] [Fe/H] Metallicity
68- 70 F3.1 km/s Vt Microturbulent velocity
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- HD/BD HD/BD name
12- 16 F5.2 [Sun] [Fe/H] Metallicity
20 A1 --- l_logA(Li) Limit flag on logA(Li)
21- 25 F5.2 [Sun] logA(Li) ?=- Lithium abundance
29- 33 F5.2 --- [O/Fe] ?=- Abundance of O
36- 40 F5.2 --- [Na/Fe] ?=- Abundance of Na
43- 47 F5.2 --- [Mg/Fe] Abundance of Mg
50- 54 F5.2 --- [Al/Fe] Abundance of Al
57- 61 F5.2 --- [Si/Fe] Abundance of Si
64- 68 F5.2 --- [Ca/Fe] Abundance of Ca
71- 75 F5.2 --- [Sc/Fe] Abundance of Sc
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- HD/BD HD/BD name
13- 17 F5.2 --- [Fe/H] Metallicity
20- 24 F5.2 --- [Ti/Fe] Abundance of Ti
27- 31 F5.2 --- [V/Fe] Abundance of V
34- 38 F5.2 --- [Cr/Fe] Abundance of Cr
41- 45 F5.2 --- [Co/Fe] Abundance of Co
48- 52 F5.2 --- [Ni/Fe] Abundance of Ni
55- 59 F5.2 --- [Zn/Fe] Abundance of Zn
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Acknowledgements:
V. Kovtyukh, val(at)deneb.odessa.ua
(End) Patricia Vannier [CDS] 18-Mar-2009