Access to Astronomical Catalogues

← Click to display the menu
J/MNRAS/419/1350    Red giants abundances in 4 open clusters (Reddy+, 2012)

Comprehensive abundance analysis of red giants in the open clusters NGC 752, 1817, 2360 and 2506. Reddy A.B.S., Giridhar S., Lambert D.L. <Mon. Not. R. Astron. Soc., 419, 1350-1361 (2012)> =2012MNRAS.419.1350R
ADC_Keywords: Clusters, open ; Stars, giant ; Equivalent widths Keywords: stars: abundances - Galaxy: abundances - open clusters and associations: individual: NGC 752 - open clusters and associations: individual: NGC 1817 - open clusters and associations: individual: NGC 2360 - open clusters and associations: individual: NGC 2506 Abstract: We have analysed high-dispersion echelle spectra (R≳50000) of red giant members for four open clusters to derive abundances for many elements. The spread in temperatures and gravities being very small among the red giants nearly the same stellar lines were employed thereby reducing the random errors. The errors of average abundance for the cluster were generally in the range 0.02-0.07dex. Our present sample covers Galactocentric distances of 8.3-10.5kpc. The [Fe/H] values are -0.02±0.05 for NGC 752, -0.07±0.06 for NGC 2360, -0.11±0.05 for NGC 1817 and -0.19±0.06 for NGC 2506. Abundances relative to Fe for elements from Na to Eu are equal within measurement uncertainties to published abundances for thin-disc giants in the field. This supports the view that field stars come from disrupted open clusters. Description: Clusters were selected from the New catalogue of optically visible open clusters and candidates (Dias et al., 2002, Cat. B/ocl). Observations were conducted during 1999 February 6-10 with Tull echelle coude spectrograph on the 2.7-m Harlan J. Smith telescope at the McDonald observatory. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 64 14 The observed stars table6.dat 45 2430 The line list for all program stars from each of the OCs presented in the paper
See also: B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2012) Byte-by-byte Description of file: table2.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 (J2000.0) 18- 19 I2 min RAm Right ascension (J2000.0) 21- 25 F5.2 s RAs Right ascension (J2000.0) 27 A1 --- DE- Declination sign (J2000.0) 28- 29 I2 deg DEd Declination (J2000.0) 31- 32 I2 arcmin DEm Declination (J2000.0) 34- 38 F5.2 arcsec DEs Declination (J2000.0) 40- 44 F5.2 mag Vmag V magnitude 46- 50 F5.2 mag B-V B-V colour index 52- 56 F5.1 km/s HRV Heliocentric radial velocity 58- 60 F3.1 km/s e_HRV rms uncertainty on HRV 62- 64 I3 --- S/N Signal-to-noise ration at 6000Å
Byte-by-byte Description of file: table6.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 Wavelength λ in Angstroms 23- 27 F5.1 --- Ion Species identification (1) 29- 33 F5.2 eV LEP Lower Excitation potential of the transition 35- 39 F5.2 [-] log(gf) Log of the oscillator strength 41- 45 F5.1 0.1pm EW Equivalent width in milli-Angstroms (2)
Note (1): The integer component of the species ID indicates the atomic number, and the decimal component indicates the ionization state (0=neutral, 1=singly ionized). Note (2): The EW given for the synthesized line (MnI, CuI, BaII and EuII, CeII and SmII) is the blend equivalent width.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Jun-2012
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

catalogue service