J/MNRAS/412/81 Lithium abundance in M4 red giants (Mucciarelli+, 2011)
Lithium abundance in the globular cluster M4: from the turn-off to the red
giant branch bump.
Mucciarelli A., Salaris M., Lovisi L., Ferraro F.R., Lanzoni B.,
Lucatello S., Gratton R.G.
<Mon. Not. R. Astron. Soc., 412, 81-94 (2011)>
=2011MNRAS.412...81M 2011MNRAS.412...81M
ADC_Keywords: Clusters, globular ; Stars, giant ; Abundances
Keywords: stars: abundances - stars: atmospheres - stars: Population II -
globular clusters: individual: M4
Abstract:
We present Li and Fe abundances for 87 stars in the globular cluster
M4, obtained by using high-resolution spectra collected with GIRAFFE
at the Very Large Telescope. The targets range from the turn-off up to
the red giant branch bump. The Li abundance in the turn-off stars is
uniform, with an average value equal to A(Li)=2.30±0.02dex
(sigma=0.10dex), consistent with the upper envelope of Li content
measured in other globular clusters and in the halo field stars,
confirming also for M4 the discrepancy with the primordial Li
abundance predicted by Wilkinson Microwave Anisotropy Probe+ big bang
nucleosynthesis (WMAP+BBNS).
Description:
This work is based on high-resolution spectroscopic observations of 87
stars in M4 performed with GIRAFFE at the FLAMES spectrograph mounted
at the Very Large Telescope (VLT) in the European Southern
Observatory, within a project aimed to search for anomalous abundances
in the Blue Straggler Stars (BSS) atmospheres.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 87 Identification numbers, coordinates, temperatures,
gravities, EW(Li), A(Li) and [Fe/H] abundances,
and S/N around the Li line for the observed stars
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See also:
J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)
J/ApJ/689/1031 : Heavy element abundances in giant stars (Yong+, 2008)
J/A+A/505/117 : Red giants abundances in 15 globular clusters (Carretta+ 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Sequential number
7- 17 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
19- 29 F11.7 deg DEdeg Declination in decimal degrees (J2000)
31- 34 I4 K Teff Effective temperature
36- 38 F3.1 [cm/s2] logg Surface gravity
40- 43 F4.1 0.1pm EW(Li) Lithium equivalent width (mÅ)
45- 48 F4.2 [Sun] A(Li) Lithium abundance
50- 54 F5.2 [Sun] [Fe/H] Metallicity
56- 58 I3 --- SNR Signal-to-noise ratio
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Sep-2011