J/ApJ/667/911 Abundances on the main sequence of ω Cen (Stanford+, 2007)
Abundances on the main sequence of ω Centauri.
Stanford L.M., Da Costa G.S., Norris J.E., Cannon R.D.
<Astrophys. J., 667, 911-929 (2007)>
=2007ApJ...667..911S 2007ApJ...667..911S
ADC_Keywords: Clusters, globular; Stars, dwarfs ; Abundances
Keywords: globular clusters: general -
globular clusters: individual (omega Centauri)
Abstract:
Abundance ratios of carbon, nitrogen, and strontium relative to iron,
calculated using spectrum synthesis techniques, are given for a sample
of main-sequence and turnoff stars that belong to the globular cluster
omega Centauri. The variations of carbon, nitrogen, and/or strontium
show several different abundance patterns as a function of [Fe/H]. The
source of the enhancements/depletions in carbon, nitrogen, and/or
strontium may be enrichment from asymptotic giant branch stars of low
(1-3M☉ and intermediate (3-8M☉ mass. Massive rotating
stars that produce excess nitrogen without carbon and oxygen
overabundances may also play a role. These abundances enable different
contributors to be considered and incorporated into the evolutionary
picture of omega Cen.
Description:
The observations and reduction of our data are described in detail in
Stanford et al. (2006, Cat. J/ApJ/647/1075), to which we refer the
reader. Suffice it here to say that the photometry of the cluster was
obtained with the 1m telescope/Tektronix CCD combination at Siding
Spring Observatory in the V and B bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 76 378 Stellar parameters, indices and abundances for
ω Cen sample
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See also:
J/ApJ/647/1075 : Age-metallicity relation of ω Cen (Stanford+, 2006)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- SDN Identification number as in Paper I
(Stanford et al. 2006, Cat. J/ApJ/647/1075),
Cl* NGC 5139 SDN NNNNNNN in Simbad
9- 14 F6.3 mag Vmag The V band magnitude
16- 20 F5.3 mag B-V The (B-V) color index
22- 25 I4 K Teff The effective temperature
27- 29 F3.1 [cm/s2] log(g) Log of the surface gravity
31- 35 F5.2 [Sun] [Fe/H] Metallicity
37- 41 F5.2 --- GBand G band (CH, ∼4300Å) index
43- 47 F5.2 --- S3839 S3839 index (1)
49- 53 F5.2 --- Sr4077 Sr II (4077Å) line index
55- 60 F6.2 --- Ba4554 Ba II (4554Å) line index
62- 66 F5.2 [-] [C/Fe] ? Log of the C/Fe number abundance
68- 71 F4.2 [-] [N/Fe] ? Log of the N/Fe number abundance
73- 76 F4.2 [-] [Sr/Fe] ? Log of the Sr/Fe number abundance
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Note (1): CN index as defined by Norris et al. (1981ApJ...244..205N 1981ApJ...244..205N) from
the violet CN band at 3883Å).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Nov-2009