J/A+A/464/967 Abundances of red giants in NGC 6388 (Carretta+, 2007)
Na-O Anticorrelation and HB. VI.
The chemical composition of the peculiar bulge globular cluster NGC 6388.
Carretta E., Bragaglia A., Gratton R.G., Momany Y., Recio-Blanco A.,
Cassisi S., Francois P., James G., Lucatello S., Moehler S.
<Astron. Astrophys. 464, 967 (2007)>
=2007A&A...464..967C 2007A&A...464..967C
ADC_Keywords: Clusters, globular ; Stars, population II ; Abundances ;
Radial velocities
Keywords: stars: abundances - stars: atmospheres - stars: Population II -
Galaxy: globular clusters: general -
Galaxy: globular clusters: individual: NGC 6388
Abstract:
We present the LTE abundance analysis of high resolution spectra for
red giant stars in the peculiar bulge globular cluster NGC 6388.
Spectra of seven members were taken using the UVES spectrograph at the
ESO VLT2 and the multiobject FLAMES facility.
We exclude any intrinsic metallicity spread in this cluster: on
average, [Fe/H]=-0.44±0.01±0.03dex on the scale of the present
series of papers, where the first error bar refers to individual
star-to-star errors and the second is systematic, relative to the
cluster. Elements involved in H-burning at high temperatures show
large spreads, exceeding the estimated errors in the analysis. In
particular, the pairs Na and O, Al and Mg are anticorrelated and Na
and Al are correlated among the giants in NGC 6388, the typical
pattern observed in all galactic globular clusters studied so far.
Stars in NGC 6388 shows an excess of alpha-process elements, similar
to the one found in the twin bulge cluster NGC 6441. Mn is found
underabundant in NGC 6388, in agreement with the average abundance
ratio shown by clusters of any metallicity. Abundances of
neutron-capture elements are homogeneously distributed within
NGC 6388; the [Eu/Fe] ratio stands above the value found in field
stars of similar metallicity.
Description:
Spectra for 13 RGB stars in NGC 6388 were obtained with
UVES/FLAMES@VLT; based on radial velocity, 7 of them resulted member
stars.
Abundances of Fe, O, Na, alpha-elements and heavier elements were
derived using equivalent widths, model atmospheres and atmospheric
parameters based on photometry.
For each star we give identification, equatorial coordinates, VBIJK
magnitudes, heliocentric radial velocity. For the 7 member stars we
also present Teff, logg, [A/H], v_t, [Fe/H], [O/Fe], [Na/Fe], [Mg/Fe],
[Al/Fe], [Si/Fe], [Ca/Fe], [Sc/Fe], [Ti/Fe], [V/Fe], [Cr/Fe], [Mn/Fe],
[Co/Fe], [Ni/Fe], [Y/Fe], [Zr/Fe], [Ba/Fe], [La/Fe], [Ce/Fe], and
[Eu/Fe]. We present here the EWs for all the above elements for the 7
member stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 13 List and relevant informations for the target
stars observed in NGC 6388 with UVES
table3.dat 40 2324 Equivalent widths
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See also:
J/A+A/455/271 : Abundances of red giants in NGC 6441 (Gratton+, 2006)
J/A+A/464/927 : Abundances of red giants in NGC 6752 (Carreta+, 2007)
J/A+A/464/953 : Abundances of red giants in NGC 6441 (Gratton+, 2007)
J/A+A/464/939 : Abundances of red giants in NGC 6218 (Carreta+, 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Identification number
8 I1 --- Fiber [1/2] fiber configuration
10- 11 I2 h RAh Right ascension (J2000) (1)
13- 14 I2 min RAm Right ascension (J2000) (1)
16- 21 F6.3 s RAs Right ascension (J2000) (1)
23 A1 --- DE- Declination sign (J2000) (1)
24- 25 I2 deg DEd Declination (J2000) (1)
27- 28 I2 arcmin DEm Declination (J2000) (1)
30- 34 F5.2 arcsec DEs Declination (J2000) (1)
36- 41 F6.3 mag Vmag Johnson V magnitude (1)
43- 48 F6.3 mag Bmag Johnson B magnitude (1)
50- 55 F6.3 mag Icmag Cousins I magnitude (1)
57- 62 F6.3 mag Jmag 2MASS J magnitude
64- 69 F6.3 mag Kmag 2MASS K magnitude
71- 77 F7.2 km/s HRV Heliocentric radial velocity
79- 80 A2 --- Memb [NM ] M=Member, NM=non member
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Note (1): Data from Momany et al. (2004A&A...420..605M 2004A&A...420..605M)
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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 --- ID Identification number
8- 12 A5 --- El Element
16- 22 F7.2 0.1nm Lambda Wavelength
24- 27 F4.2 eV EP Excitation Potential
29- 34 F6.2 --- loggf Oscillator strength
36- 40 F5.1 0.1pm EW Equivalent width (mÅ)
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Acknowledgements:
Eugenio Carretta, eugenio.carretta(at)oabo.inaf.it
References:
Carreta et al., Paper I, NGC 2808 2006A&A...450..523C 2006A&A...450..523C
Carreta et al., Paper II, NGC 6752 2007A&A...464..927C 2007A&A...464..927C, Cat. J/A+A/464/927
Gratton et al., Paper III, NGC 6441 2006A&A...455..271G 2006A&A...455..271G, Cat. J/A+A/455/271
Carreta et al., Paper IV, NGC 6218 2007A&A...464..939C 2007A&A...464..939C, Cat. J/A+A/464/939
Gratton et al., Paper V, NGC 6441 2007A&A...464..953G 2007A&A...464..953G, Cat. J/A+A/464/953
(End) Patricia Vannier [CDS] 22-Feb-2007