J/MNRAS/431/3338 Abundances of red giants in open clusters (Reddy+, 2013)
Comprehensive abundance analysis of red giants in the open clusters
NGC 2527, 2682, 2482, 2539, 2335, 2251 and 2266.
Reddy A.B.S., Giridhar S., Lambert D.L.
<Mon. Not. R. Astron. Soc., 431, 3338-3348 (2013)>
=2013MNRAS.431.3338R 2013MNRAS.431.3338R
ADC_Keywords: Clusters, open ; Stars, giant ; Abundances
Keywords: Galaxy: abundances -
open clusters and associations: individual (NGC 2527, NGC 2682,
NGC 2482,NGC 2539, NGC 2335, NGC 2251, NGC 2266) - stars: abundances
Abstract:
We have analysed high-resolution echelle spectra of red giant members
for seven open clusters in the Galactic anticentre direction to
explore their chemical compositions. Cluster membership has been
confirmed by radial velocity. The spread in temperatures and gravities
being very small among the red giants, nearly the same stellar lines
were employed for all stars thereby reducing the abundance errors: the
errors of the average abundance for a cluster were generally in the
0.02-0.05dex range. Our present sample covers Galactocentric distances
of 8.3-11.3kpc and an age range of 0.2-4.3Gyr. A careful comparison
of our results for the cluster NGC 2682 (M67) to other high-resolution
abundance studies in the literature shows general good agreement for
almost all elements in common.
Description:
High-resolution optical spectra of the program stars were obtained
during the nights of 2011 January 12-14 and March 15-18 with the
Robert G. Tull echelle coude spectrograph on the 2.7-m Harlan J.
Smith telescope at the McDonald observatory using a 2048x2048 pixel
Tektronix charge-coupled device as a detector.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 76 12 The observed stars
table3.dat 97 362 Line list for all program stars
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See also:
J/A+A/375/30 : RV of 4 open clusters red giants (Mermilliod+, 2001)
J/AN/329/609 : Red giant candidates in 10 open clusters (Claria+, 2008)
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)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
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
10- 12 I3 --- Star Star identification number (within the cluster)
14- 15 I2 h RAh Right ascension (J2000.0)
17- 18 I2 min RAm Right ascension (J2000.0)
20- 24 F5.2 s RAs Right ascension (J2000.0)
26 A1 --- DE- Declination sign (J2000.0)
27- 28 I2 deg DEd Declination (J2000.0)
30- 31 I2 arcmin DEm Declination (J2000.0)
33- 37 F5.2 arcsec DEs Declination (J2000.0)
39- 43 F5.2 mag Vmag V 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- 68 F6.2 km/s HRV Heliocentric radial velocity
70- 72 F3.1 km/s e_HRV rms uncertainty on HRV
74- 76 I3 --- S/N [100/190] Signal-to-noise at 6000Å
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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 lambda Wavelength λ (Å)
9- 13 F5.1 --- Ion Species identification (1)
15- 19 F5.2 eV LEP Lower Excitation potential of the transition.
21- 25 F5.2 [-] log(gf) Log of the oscillator strength
27- 31 F5.1 0.1pm EW3 ?=- Equivalent width of NGC 2251#3 (mÅ) (2)
33- 37 F5.1 0.1pm EW33 ?=- Equivalent width of NGC 2251#33 (mÅ) (2)
39- 43 F5.1 0.1pm EW11 ?=- Equivalent width of NGC 2335#11 (mÅ) (2)
45- 49 F5.1 0.1pm EW9 ?=- Equivalent width of NGC 2482#9 (mÅ) (2)
51- 55 F5.1 0.1pm EW10 ?=- Equivalent width of NGC 2527#10 (mÅ) (2)
57- 61 F5.1 0.1pm EW203 ?=- Equivalent width of NGC 2527#203 (mÅ) (2)
63- 67 F5.1 0.1pm EW346 ?=- Equivalent width of NGC 2539#346 (mÅ) (2)
69- 73 F5.1 0.1pm EW463 ?=- Equivalent width of NGC 2539#463 (mÅ) (2)
75- 79 F5.1 0.1pm EW84 ?=- Equivalent width of NGC 2682#84 (mÅ) (2)
81- 85 F5.1 0.1pm EW151 ?=- Equivalent width of NGC 2682#151 (mÅ) (2)
87- 91 F5.1 0.1pm EW164 ?=- Equivalent width of NGC 2682#164 (mÅ) (2)
93- 97 F5.1 0.1pm EW73 ?=- Equivalent width of NGC 2266#73 (mÅ) (2)
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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): 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) Patricia Vannier [CDS] 19-Jun-2014