J/A+AS/121/95 Giant stars abundances in 24 clusters (Carretta+ 1997)
Abundances for globular cluster giants. I.
Homogeneous metallicities for 24 clusters
Carretta E., Gratton R.G.
<Astron. Astrophys. Suppl. Ser. 121, 95 (1997)>
=1997A&AS..121...95C 1997A&AS..121...95C (SIMBAD/NED BibCode)
ADC_Keywords: Effective temperatures ; Abundances, [Fe/H]
Keywords: stars: abundances - stars: Population II - globular clusters: general
Abstract:
We have obtained high resolution, high signal-to-noise ratio CCD
echelle spectra of 10 bright red giants in 3 globular clusters
(47 Tuc, NGC 6752 and NGC 6397) roughly spanning the whole range of
metallicities of the galactic globular cluster system. The analysis of
this newly acquired material reveals no significant evidence of
star-to-star variation of the [Fe/H] ratio in these three clusters.
Moreover, a large set of high quality literature data (equivalent
widths from high dispersion CCD spectra) was re-analyzed in an
homogeneous and self-consistent way to integrate our observations and
derive new metal abundances for more than 160 bright red giants in 24
globular clusters (i.e. about 16% of the known population of galactic
globulars). This set was then used to define a new metallicity scale
for globular clusters which is the result of high quality, direct
spectroscopic data, of new and updated model atmospheres from the grid
of Kurucz (1992), and of a careful fine abundance analysis; this last,
in turn, is based on a common set of both atomic and atmospheric
parameters for all the stars examined.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table9 80 162 Atmospheric parameters and abundance analysis
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Byte-by-byte Description of file: table9
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC NGC designation
6- 13 A8 --- Name Star name
16- 20 A5 --- Source Source for equivalent width
23- 26 I4 K Teff Effective Temperature (K)
29- 32 F4.2 [cm/s2] logg Surface gravity
34- 38 F5.2 [Sun] [A/H] Abundance
41- 44 F4.2 km/s Vel Microturbulent velocities
46- 47 I2 --- nFeI Number of FeI lines used
49- 52 F4.2 --- logn(FeI) Absolute number density abundances of FeI
54- 57 F4.2 --- e_logn(FeI) Sigma for Fe I abundances
61 I1 --- nFeII ? Number of FeII lines used
64- 67 F4.2 --- logn(FeII) ? Absolute number density abundances of FeII
70- 73 F4.2 --- e_logn(FeII) ? Sigma for Fe II abundances
75- 79 F5.2 --- [Fe/H] Metallicity
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Acknowledgements: Eugenio Carretta
(End) Patricia Bauer [CDS] 03-Jun-1996