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 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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)
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Acknowledgements:
Ricardo Carrera, rcarrera(at)iac.es
(End) Patricia Vannier [CDS] 01-Sep-2011