J/MNRAS/364/272 Elemental abundances in Blanco 1 (Ford+, 2005)
Elemental abundances in the Blanco 1 open cluster.
Ford A., Jeffries R.D., Smalley B.
<Mon. Not. R. Astron. Soc., 364, 272-282 (2005)>
=2005MNRAS.364..272F 2005MNRAS.364..272F
ADC_Keywords: Clusters, open ; Abundances, peculiar
Keywords: stars: abundances - stars: late-type -
open clusters and associations: individual: Blanco 1
Abstract:
High-resolution spectroscopy is used to determine the detailed
chemical abundances of a group of eight F- and G-type stars in the
young open cluster Blanco 1. An average [Fe/H] of +0.04±0.02
(internal error)±0.04 (external error) is found, considerably
lower than a previous spectroscopic estimate for this cluster.
The difference is due mainly to our adoption of significantly
cooler temperatures that are consistent with both photometric
and spectroscopic constraints. Blanco 1 exhibits subsolar
[Ni/Fe](0.18±0.01±0.01), [Si/Fe](0.09±0.02±0.03),
[Mg/Fe](0.14±0.02±0.03) and [Ca/Fe](0.09±0.03±0.03);
ratios that are not observed among nearby field stars.
Description:
High-resolution spectra were collected on 2002 August 2527 using the
3.9-m Anglo-Australian Telescope and a MITLL3 CCD camera.
Objects:
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RA (2000) DE Designation(s)
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00 06 16.3 -30 05 57 W113 = Cl* Blanco 1 WGL 113
00 02 21.6 -30 08 22 W38 = Cl* Blanco 1 WGL 38
00 03 29.0 -30 19 27 W60 = Cl* Blanco 1 WGL 60
00 03 33.6 -30 28 42 W63 = Cl* Blanco 1 WGL 63
00 03 33.7 -30 15 44 W64 = Cl* Blanco 1 WGL 64
23 59 26.7 -28 51 14 W8 = Cl* Blanco 1 WGL 8
00 05 08.2 -30 29 42 ZS141 = Cl* Blanco 1 ZS 141
00 01 46.5 -29 46 39 ZS58 = Cl* Blanco 1 ZS 58
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 9 Derived atmospheric parameters for sample stars
and Sun
table2.dat 40 774 Atomic data and equivalent width measurements
table3.dat 147 9 Abundances for target stars and Sun
table4.dat 18 80 Abundance uncertainties due to estimated
atmospheric uncertainties
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See also:
J/A+AS/121/213 : BV photometry of Blanco 1 stars (Panagi+, 1997)
J/A+AS/76/101 : UBV and uvbyb in zeta Scl cluster (Westerlund+, 1988)
J/A+A/399/919 : X-ray Luminosities in Blanco 1 (Pillitteri+, 2003)
J/A+A/421/175 : XMM sources in Blanco 1 (Pillitteri+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Star name (G1)
8- 12 A5 --- ZS ZS designation (de Epstein & Epstein
(1985AJ.....90.1211D 1985AJ.....90.1211D)
16- 19 F4.2 mag V-K ? V-K colour index
21- 24 I4 K Teffph ? Effective temperature derived from photometry
26- 29 I4 K Teffsp Effective temperature derived from spectroscopy
31- 34 F4.2 [cm/s2] logg Surface gravity
36- 40 F5.2 [Sun] [Fe/H]s Metallicity
42- 45 F4.2 [Sun] e_[Fe/H]s ? rms uncertainty on [Fe/H]
47- 50 F4.2 km/s vt Microturbulent velocity
52- 54 F3.1 km/s RV Radial velocity
56- 58 F3.1 km/s e_RV ? rms uncertainty on RV
60- 63 F4.1 km/s vsini Rotational velocity
65- 67 F3.1 km/s e_vsini ? rms uncertainty on vsini
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Star name (G1)
7- 11 A5 --- Ion Ion designation
13- 20 F8.3 0.1nm Lambda Wavelength
22- 26 F5.3 eV XiP Excitation potential
28- 33 F6.3 --- loggf Oscillator strength
35- 39 F5.1 0.1pm EW ? Equivalent width
40 A1 --- n_EW [bc] Blended lines (1)
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Note (1): Blend flags as follows:
b = Li I 6707.760 and Li I 6707.910 blended
c = S I 6757.007 and S I 6757.171 blended
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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- 5 A5 --- Name Star Name (G1) (1)
7- 10 F4.2 --- A(Li)LTE ? LTE Li abundance
12- 15 F4.2 --- e_A(Li)LTE ? ? rms uncertainty on A(Li)LTE (2)
17- 20 F4.2 --- A(Li) ? NLTE Li abundance
22 I1 --- o_A(Li) ? Number of features used for A(Li) value
24- 28 F5.2 [Sun] [C/H] Abundance [C/H] (1)
30- 33 F4.2 [Sun] e_[C/H] ? rms uncertainty on [C/H] (2)
35 I1 --- o_[C/H] Number of features used for [C/H] value
37- 41 F5.2 [Sun] [O/H]LTE LTE abundance [O/H] (1)
43- 46 F4.2 [Sun] e_[O/H]LTE ? rms uncertainty on [O/H]LTE (2)
48- 52 F5.2 [Sun] [O/H] ? NLTE abundance [O/H] (1)
54 I1 --- o_[O/H] Number of features used for [O/H] value
56- 60 F5.2 [Sun] [Mg/H] Abundance [Mg/H] (1)
62- 65 F4.2 [Sun] e_[Mg/H] ? rms uncertainty on [Mg/H] (2)
67 I1 --- o_[Mg/H] Number of features used for [Mg/H] value
69- 73 F5.2 [Sun] [Si/H] Abundance [Si/H] (1)
75- 78 F4.2 [Sun] e_[Si/H] ? rms uncertainty on [Si/H] (2)
80 I1 --- o_[Si/H] Number of features used for [Si/H] value
82- 86 F5.2 [Sun] [S/H] Abundance [S/H] (1)
88- 91 F4.2 [Sun] e_[S/H] ? rms uncertainty on [S/H] (2)
93 I1 --- o_[S/H] Number of features used for [S/H] value
95- 99 F5.2 [Sun] [Ca/H] Abundance [Ca/H] (1)
101-104 F4.2 [Sun] e_[Ca/H] ? rms uncertainty on [Ca/H] (2)
106 I1 --- o_[Ca/H] Number of features used for [Ca/H] value
108-112 F5.2 [Sun] [Ti/H] Abundance [Ti/H] (1)
114-117 F4.2 [Sun] e_[Ti/H] ? rms uncertainty on [Ti/H] (2)
119 I1 --- o_[Ti/H] Number of features used for [Ti/H] value
121-125 F5.2 [Sun] [Fe/H] Abundance [Fe/H] (1)
127-130 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H] (2)
132-133 I2 --- o_[Fe/H] Number of features used for [Fe/H] value
135-139 F5.2 [Sun] [Ni/H] Abundance [Ni/H] (1)
141-144 F4.2 [Sun] e_[Ni/H] ? rms uncertainty on [Ni/H] (2)
146-147 I2 --- o_[Ni/H] Number of features used for [Ni/H] value
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Note (1): Last line contains the assuming solar abundances
(in a log scale, not relative to the Sun)
Note (2): Errors quoted are the standard errors in the measured abundances
(sigma/n1/2), where n is the number of features used
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Star name (G1)
7- 8 A2 --- El Element
10- 13 F4.2 [Sun] e[X/H] ? Net uncertainty in [X/H] (1)
15- 18 F4.2 [Sun] e[X/Fe] ? Net uncertainty in [X/Fe] (1)
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Note (1): Quadratic sum of uncertainties due to effective temperature (±100K),
logg (±0.2), [M/H] (±0.1dex) and microturbulence (±0.2km/s).
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Global notes:
Note (G1): Names are
- WNNN from Westerlund et al., 1988, Cat. J/A+AS/76/101,
Cl* Blanco 1 WGL NNN in Simbad
- ZSNNN from de Epstein & Epstein, 1985AJ.....90.1211D 1985AJ.....90.1211D,
Cl* Blanco 1 ZS NNN in Simbad
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-May-2006