J/MNRAS/450/4301 Line list for red giants in open clusters (Reddy+, 2015)
Comprehensive abundance analysis of red giants in the open clusters NGC 1342,
1662, 1912, 2354 and 2447.
Reddy A.B.S., Giridhar S., Lambert D.L.
<Mon. Not. R. Astron. Soc., 450, 4301-4322 (2015)>
=2015MNRAS.450.4301R 2015MNRAS.450.4301R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, giant ; Equivalent widths ; Photometry ;
Radial velocities
Keywords: Galaxy: abundances -
Galaxy: open clusters and associations: individual: NGC 1342 -
Galaxy: open clusters and associations: individual: NGC 1662 -
Galaxy: open clusters and associations: individual: NGC 1912 -
Galaxy: open clusters and associations: individual: NGC 2354 -
Galaxy: open clusters and associations: individual: NGC 2447
Abstract:
We have observed high-dispersion echelle spectra of red giant members
in the five open clusters (OCs) NGC 1342, NGC 1662, NGC 1912, NGC 2354
and NGC 2447 and determined their radial velocities and chemical
compositions. These are the first chemical abundance measurements for
all but NGC 2447. We combined our clusters from this and previous
papers with a sample drawn from the literature for which we remeasured
the chemical abundances to establish a common abundance scale. With
this homogeneous sample of OCs, we study the relative elemental
abundances of stars in OCs in comparison with field stars as a
function of age and metallicity. We find a range of mild enrichment of
heavy (Ba-Eu) elements in young OC giants over field stars of the same
metallicity. Our analysis supports that the youngest stellar
generations in cluster might be underrepresented by the solar
neighbourhood field stars.
Description:
Observations were carried out during observing runs in 2011 May and
November, 2012 November and 2013 March using the Robert G. Tull echelle
spectrograph (Tull et al. 1995PASP..107..251T 1995PASP..107..251T) at the coude focus of
the 2.7m Harlan J. Smith telescope located at the McDonald Observatory.
On all occasions we employed a 2048x2048 24µm pixel,
backside-illuminated, anti-reflection coated CCD as a detector and the
52.67 grooves/mm echelle grating with exposures centred at 5060Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 86 12 The journal of the observations for each of
the cluster members analysed in this paper
table3.dat 95 343 The line list for all cluster members analysed
in this paper
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See also:
J/A+AS/134/301 : NGC 2354 red giants (Claria+ 1999)
J/A+A/360/509 : Chemical abundances in 7 red giants (Hamdani+, 2000)
J/AJ/137/4753 : EW of red giants in 4 open clusters (Jacobson+, 2009)
J/AJ/139/1942 : EW of red giants in 6 open clusters (Friel+, 2010)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name (NGC NNNN)
10- 12 I3 --- Star Star identification number (within the cluster)
14- 15 I2 h RAh Hour of Right Ascension (J2000)
17- 18 I2 min RAm Minute of Right Ascension (J2000)
20- 24 F5.2 s RAs Second of Right Ascension (J2000)
26 A1 --- DE- Sign of the Declination (J2000)
27- 28 I2 deg DEd Degree of Declination (J2000)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000)
33- 37 F5.2 arcsec DEs Arcsec of Declination (J2000)
39- 43 F5.2 mag Vmag V-band magnitude
45- 49 F5.2 mag B-V B-V colour index
51- 55 F5.2 mag V-Ks V-Ks colour index
57- 61 F5.2 mag J-Ks J-Ks colour index
63- 67 F5.1 km/s HRV Heliocentric radial velocity
69- 71 F3.1 km/s e_HRV Uncertainty in HRV
73- 75 I3 --- S/N [100/180] Signal-to-noise ratio at 6000Å
77- 86 A10 "date" Date Date of observation
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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- 7 F7.2 0.1nm Wave Wavelength λ (Å)
9- 12 F4.1 --- ID Species identification (1)
14- 17 F4.2 eV LEP Lower Excitation potential of the transition (2)
19- 23 F5.2 [-] log(gf) ? Log of the oscillator strength
25- 29 F5.1 0.1pm EW4 Equivalent width for NGC 1342#4 (mÅ) (3)
31- 35 F5.1 0.1pm EW6 ? Equivalent width for NGC 1342#6 (mÅ) (3)
37- 41 F5.1 0.1pm EW7 ? Equivalent width for NGC 1342#7 (mÅ) (3)
43- 47 F5.1 0.1pm EW1 ? Equivalent width for NGC 1662#1 (mÅ) (3)
49- 53 F5.1 0.1pm EW2 ? Equivalent width for NGC 1662#2 (mÅ) (3)
55- 59 F5.1 0.1pm EW3 ? Equivalent width for NGC 1912#3 (mÅ) (3)
61- 65 F5.1 0.1pm EW70 ? Equivalent width for NGC 1912#70 (mÅ) (3)
67- 71 F5.1 0.1pm EW183 ? Equivalent width for NGC 2354#183 (mÅ) (3)
73- 77 F5.1 0.1pm EW205 ? Equivalent width for NGC 2354#205 (mÅ) (3)
79- 83 F5.1 0.1pm EW28 ? Equivalent width for NGC 2447#28 (mÅ) (3)
85- 89 F5.1 0.1pm EW34 ? Equivalent width for NGC 2447#34 (mÅ) (3)
91- 95 F5.1 0.1pm EW41 ? Equivalent width for NGC 2447#41 (mÅ) (3)
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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): All the lines are arranged in the order of their increasing LEP.
Note (3): The EW given for the synthesized line (Mn I, Cu I, Ba II and Eu II,
Ce II and Sm II) is the blend equivalent width.
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 14-Dec-2017