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J/A+A/523/A11      Open clusters towards the Galactic center    (Magrini+, 2010)

Open clusters towards the Galactic center: chemistry and dynamics. A VLT spectroscopic study of NGC6192, NGC6404, NGC6583. Magrini L., Randich S., Zoccali M., Jilkova L., Carraro G., Galli D., Maiorca E., Busso M. <Astron. Astrophys. 523, A11 (2010)> =2010A&A...523A..11M
ADC_Keywords: Clusters, open ; Abundances, [Fe/H] Keywords: Galaxy: abundances - Galaxy: evolution - open clusters and associations: individual: NGC6192, NGC6404, NGC6583 Abstract: In the framework of the study of the Galactic metallicity gradient and its time evolution, we present new high-resolution spectroscopic observations obtained with FLAMES and the fiber link to UVES at VLT of three open clusters (OCs) located within ∼7kpc from the Galactic Center (GC): NGC 6192, NGC 6404, NGC 6583. We also present new orbit determination for all OCs with Galactocentric distances (Rgc)≤8kpc and metallicity from high-resolution spectroscopy. We have derived memberships of a group of evolved stars for each clusters, obtaining a sample of 4, 4, and 2 member stars in NGC 6192, NGC 6404, and NGC 6583, respectively. Using standard LTE analysis we derived stellar parameters and abundance ratios for the iron-peak elements Fe, Ni, Cr, and for the α-elements Al, Mg, Si, Ti, Ca. We calculated the orbits of the OCs currently located within 8kpc from the GC, and discuss their implication on the present-time radial location. The average metallicities of the three clusters are all oversolar: [Fe/H]= +0.12±0.04 (NGC 6192), +0.11±0.04 (NGC 6404), +0.37±0.03 (NGC 6583). They are in qualitative agreement with their galactocentric distances, being all internal OCs, and thus expected to be metal richer than the solar neighborhood. The abundance ratios of the other elements over iron [X/Fe] are consistent with solar values. The clusters we have analysed, together with other OC and Cepheid data, confirm a steep gradient in the inner disk, a signature of an evolutionary rate different than in the outer disk. Description: Tables A.1-3: wavelengths, element, and corresponding EW for each star. Table A.4: EW measured in the solar spectrum, obtained with the same UVES setup of our observations, containing wavelengths, name of the element, the excitation potential EP, log (gf), and measured EW in the solar spectrum. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 84 15 List of stars tablea1.dat 25 696 Equivalent widths of evolved stars in NGC6192 tablea2.dat 25 421 Equivalent widths of evolved stars in NGC6404 tablea3.dat 25 265 Equivalent widths of evolved stars in NGC6583 tablea4.dat 36 158 Solar equivalent widths
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [NGC] 5- 8 I4 --- NGC Cluster NGC number 10- 13 I04 --- Star Star number in cluster 15- 16 I2 h RAh Right Ascension J2000 (hours) 18- 19 I2 min RAm Right Ascension J2000 (minutes) 21- 25 F5.2 s RAs Right Ascension J2000 (seconds) 27 A1 --- DE- Declination J2000 (sign) 28- 29 I2 deg DEd Declination J2000 (degrees) 31- 32 I2 arcmin DEm Declination J2000 (minutes) 34- 37 F4.1 arcsec DEs Declination J2000 (seconds) 39- 44 F6.3 mag Vmag Johnson V magnitude 46- 50 F5.3 mag V-I V-I color index 52- 57 F6.3 mag Jmag 2MASS J magnitude 59- 64 F6.3 mag Hmag 2MASS H magnitude 66- 71 F6.3 mag Kmag 2MASS Ks magnitude 73- 75 I3 --- S/N Signal to noise ratio (at 650nm) 77- 81 F5.1 km/s RV Radial velocity 83- 84 A2 --- Mm [M NM] Membership (Member of NotMember)
Byte-by-byte Description of file: tablea[123].dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm lambda Rest frame wavelength 10- 13 A4 --- Ion Ion 15- 18 I04 --- Star Star ID number 20- 25 F6.1 0.1pm EW Equivalent width
Byte-by-byte Description of file: tablea4.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm lambda Rest frame wavelength 10- 13 A4 --- Ion Ion 15- 20 F6.3 eV EP Excitation potential 23- 28 F6.3 --- log(gf) Oscillator strengths 31- 36 F6.1 0.1pm EW Equivalent Width
Acknowledgements: Laura Magrini <laura(at)arcetri.astro.it>
(End) Laura Magrini [Arcetri Obs.], Francois Ochsenbein [CDS] 23-Aug-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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