J/MNRAS/434/1681 Extremely metal-poor stars CaII triplet (Carrera+, 2013)
The near-infrared CaII triplet as a metallicity indicator.
II. Extension to extremely metal-poor metallicity regimes.
Carrera R., Pancino E., Gallart C., Del Pino A.
<Mon. Not. R. Astron. Soc., 434, 1681-1691 (2013)>
=2013MNRAS.434.1681C 2013MNRAS.434.1681C
ADC_Keywords: Clusters, open ; Clusters, globular ; Stars, late-type ;
Equivalent widths ; Radial velocities
Keywords: techniques: spectroscopic - stars: abundances - stars: late-type
Abstract:
We extend our previous calibration of the infrared CaII triplet (CaT)
as a metallicity indicator to the metal-poor regime by including
observations of 55 field stars with [Fe/H] down to -4.0dex. While we
previously solved the saturation at high metallicity using a
combination of a Lorentzian and a Gaussian to reproduce the line
profiles, in this paper we address the non-linearity at low
metallicity following the suggestion of Starkenburg et al. of adding
two non-linear terms to the relation among the [Fe/H], luminosity and
strength of the calcium triplet lines. Our calibration thus extends
from -4.0 to +0.5 in metallicity and is presented using four different
luminosity indicators: V-VHB, MV, MI and MK. The calibration
obtained in this paper results in a tight correlation between [Fe/H]
abundances measured from high-resolution spectra and [Fe/H] values
derived from the CaT, over the whole metallicity range covered.
Description:
The CaT calibration obtained in Paper I (Carrera et al.,
2007AJ....134.1298C 2007AJ....134.1298C, Cat. J/AJ/134/1298) was obtained from
observations of almost 500 RGB stars in 29 Galactic open and globular
clusters, covering a total metallicity range of -2.33≤[Fe/H]≤+0.47.
We used the same sample in this paper, so we refer the reader to Paper
I for a detailed discussion about the observations and data reduction
of these stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 25 Cluster sample
table2.dat 108 56 Metal-poor star sample
table3.dat 46 460 Equivalent widths of the three Ca triplet lines for
both cluster and field stars in our sample
refs.dat 77 32 References
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See also:
J/AJ/134/1298 : CaII equivalent widths in 29 Galactic clusters (Carrera+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Cluster Cluster name
16- 21 A6 --- OName Other name
23- 27 F5.2 [Sun] [Fe/H] [-2.4/0.5] Metallicity
29- 32 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H]
34- 38 F5.2 [Sun] [Ca/H] [-2.1/0.4]? Abundance [Ca/H]
40- 43 F4.2 [Sun] e_[Ca/H] ? rms uncertainty on [Ca/H]
45- 48 A4 --- r_[Fe/H] Reference, in refs.dat file
51- 55 F5.2 [Sun] [Fe/H]I [-2.2/0.5]? Metallicity from Paper I
57- 60 F4.2 [Sun] e_[Fe/H]I ? rms uncertainty on [Fe/H]I
62- 66 F5.2 Gyr Age [0.2/13] Age
68- 70 F3.1 Gyr e_Age rms uncertainty on Age
72- 76 F5.2 mag (m-M)V Distance modulus
78- 81 F4.2 mag E(B-V) Redenning
83- 88 A6 --- r_E(B-V) Reference, in refs.dat file
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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- 12 A12 --- Name Star name
14- 17 I4 K Teff Effective temperature
19- 21 I3 K e_Teff rms uncertainty on Teff
23- 26 F4.2 [cm/s2] logg Surface gravity
28- 30 F3.1 [cm/s2] e_logg rms uncertainty on logg
32- 36 F5.2 [Sun] [Fe/H] [-3.9/-0.1] Metallicity
38- 41 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H]
43- 47 F5.2 [Sun] [Ca/H] [-4.0/-0.2] Abundance [Ca/H]
49- 52 F4.2 [Sun] e_[Ca/H] rms uncertainty on [Ca/H]
54- 55 I2 --- Ref Reference (1)
57- 61 F5.2 mag Vmag V magnitude
63- 67 F5.2 mag VMAG Absolute V magnitude
69- 72 F4.2 mag e_VMAG rms uncertainty on VMAG
74- 78 F5.2 mag IMAG Absolute I magnitude
80- 83 F4.2 mag e_IMAG rms uncertainty on IMAG
85- 89 F5.2 mag KMAG Absolute K magnitude
91- 94 F4.2 mag e_KMAG rms uncertainty on KMAG
96- 99 I4 km/s RV Radial velocity
101-102 I2 km/s e_RV rms uncertainty on RV
104-108 F5.1 --- S/N [24/144] Signal to noise ratio
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Note (1): References as follows:
1 = Barklem et al. (2005A&A...439..129B 2005A&A...439..129B, Cat. J/A+A/439/129)
2 = Andrievsky et al. (2011A&A...530A.105A 2011A&A...530A.105A)
3 = Lai et al. (2008ApJ...681.1524L 2008ApJ...681.1524L, Cat. J/ApJ/681/1524)
4 = Johnson (2002ApJS..139..219J 2002ApJS..139..219J)
5 = McWilliam (1990ApJS...74.1075M 1990ApJS...74.1075M)
6 = Hollek et al. (2011ApJ...742...54H 2011ApJ...742...54H, Cat. J/ApJ/742/54)
7 = Fulbright (2000AJ....120.1841F 2000AJ....120.1841F, Cat. J/AJ/120/1841)
8 = Wu et al. (2011A&A...525A..71W 2011A&A...525A..71W, Cat. J/A+A/525/A71)
9 = Luck & Bond (1985ApJ...292..559L 1985ApJ...292..559L)
10 = Pilachowski, Sneden & Kraft (1996AJ....111.1689P 1996AJ....111.1689P)
11 = McWilliam et al. (1995AJ....109.2757M 1995AJ....109.2757M)
12 = Giridhar et al. (2001PASP..113..519G 2001PASP..113..519G)
13 = Zhang et al. (2009ApJ...706.1095Z 2009ApJ...706.1095Z, Cat. J/ApJ/706/1095)
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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- 16 A16 --- Name Star name
18- 21 F4.2 0.1nm W8498 Equivalent width of CaII triplet line at 8498Å
23- 26 F4.2 0.1nm e_W8498 rms uncertainty on W8498
28- 31 F4.2 0.1nm W8542 Equivalent width of CaII triplet line at 8542Å
33- 36 F4.2 0.1nm e_W8542 rms uncertainty on W8542
38- 41 F4.2 0.1nm W8662 Equivalent width of CaII triplet line at 8662Å
43- 46 F4.2 0.1nm e_W8662 rms uncertainty on W8662
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 56 A33 --- Aut Author's name
58- 77 A20 --- Com Comments
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History:
From electronic version of the journal
References:
Carrera et al., Paper I 2007AJ....134.1298C 2007AJ....134.1298C, Cat. J/AJ/134/1298
(End) Patricia Vannier [CDS] 09-Sep-2014