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J/A+A/535/A30   Chemical abundance of 12 stars in open clusters (Carrera+, 2011)

Chemical abundance analysis of the open clusters Berkeley 32, NGC 752, Hyades and Praesepe. Carrera R., Pancino E. <Astron. Astrophys. 535, A30 (2011)> =2011A&A...535A..30C
ADC_Keywords: Clusters, open ; Equivalent widths Keywords: Galaxy: disk - Galaxy: open clusters and associations: individual: NGC 752, Hyades, Berkeley 32, Preasepe (M 44) - stars: abundances Abstract: Open clusters are ideal test particles for studying the chemical evolution of the Galactic disc. However, the number and accuracy of existing high-resolution abundance determinations, not only of [Fe/H], but also of other key elements, remains largely insufficient. We attempt to increase the number of Galactic open clusters that have high quality abundance determinations, and to gather all the literature determinations published so far. Description: Using high-resolution (R∼30000), high-quality (S/N≥60 per pixel), we obtained spectra for twelve stars in four open clusters with the fibre spectrograph FOCES, at the 2.2 Calar Alto Telescope in Spain.We employ a classical equivalent-width analysis to obtain accurate abundances of sixteen elements: Al, Ba, Ca, Co, Cr, Fe, La,Mg, Na, Nd, Ni, Sc, Si, Ti, V, and Y.We derived oxygen abundances derived by means of spectral synthesis of the 6300Å forbidden line. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 103 12 Observing logs and programme star properties table5.dat 57 4042 Equivalent widths and atomic data of the programme stars
See also: J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Cluster Cluster name 10- 13 I4 --- Star Star number within the cluster 15- 16 I2 h RAh Right ascension (J2000) 18- 19 I2 min RAm Right ascension (J2000) 21- 24 F4.1 s RAs Right ascension (J2000) 26 A1 --- DE- Declination sign (J2000) 27- 28 I2 deg DEd Declination (J2000) 30- 31 I2 arcmin DEm Declination (J2000) 33- 36 F4.1 arcsec DEs Declination (J2000) 38- 42 F5.2 mag Bmag B magnitude 44- 48 F5.2 mag Vmag V magnitude 50- 54 F5.2 mag Rmag ?=- R magnitude 56- 60 F5.2 mag Icmag ?=- Cousins I magnitude 62- 66 F5.2 mag Ksmag Ks magnitude 68 I1 --- Nexp Number of exposures 70- 74 I5 s Texp Total exposure time 76- 78 I3 --- S/N Signal-to-noise ratio 81-103 A23 --- SName Simbad name
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Cluster Cluster name 10- 13 I4 --- Star Star number within the cluster 15- 21 F7.2 0.1nm lambda [5055/8980] Wavelength in Angstroms 23- 24 A2 --- El Element name 26 I1 --- ion Ionization stage (1 for neutral element) 28- 32 F5.2 eV chiEx Excitation potential 34- 39 F6.2 --- loggf Logarithm of the oscillator strength 41- 45 F5.1 0.1pm EW ?=-9.9 Equivalent width (in mA) 47- 50 F4.1 0.1pm e_EW ?=-9.9 rms uncertainty on EW 52- 57 F6.3 --- Q ?=-9.999 DAOSPEC quality parameter Q (large values are bad)
Acknowledgements: Ricardo Carrera, rcarrera(at)
(End) Patricia Vannier [CDS] 01-Sep-2011
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