J/MNRAS/469/3042 Metallicities in the Geneva photometric system (Netopil, 2017)
Metallicity calibrations for dwarf stars and giants in the
Geneva photometric system.
Netopil M.
<Mon. Not. R. Astron. Soc. 469, 3042 (2017)>
=2017MNRAS.469.3042N 2017MNRAS.469.3042N (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, Geneva ; Clusters, open ; Abundances, [Fe/H]
Keywords: techniques: photometric - stars: abundances - Galaxy: abundances -
open clusters and associations: general
Abstract:
We use the most homogeneous Geneva seven-colour photometric system to
derive new metallicity calibrations for early A- to K-type stars that
cover both, dwarf stars and giants. The calibrations are based on
several spectroscopic data sets that were merged to a common scale,
and we applied them to open cluster data to obtain an additional proof
of the metallicity scale and accuracy. In total, metallicities of 54
open clusters are presented. The accuracy of the calibrations for
single stars is in general below 0.1dex, but for the open cluster
sample with mean values based on several stars we find a much better
precision, a scatter as low as about 0.03dex. Furthermore, we combine
the new results with another comprehensive photometric data set to
present a catalogue of mean metallicities for more than 3000 F- and
G-type dwarf stars with sigma about 0.06dex. The list was extended by
more than 1200 hotter stars up to about 8500K (or spectral type A3)
by taking advantage of their almost reddening free characteristic in
the new Geneva metallicity calibrations. These two large samples are
well suited as primary or secondary calibrators of other data, and we
already identified about 20 spectroscopic data sets that show offsets
up to about 0.4dex.
Description:
The tables include metallicities for some thousands of field stars
based on new calibrations for the Geneva photometric system.
Table 1 includes mean photometric metallicities by combining new
results with data of the Geneva-Copenhagen Survey (Casagrande et al.,
2011A&A...530A.138C 2011A&A...530A.138C).
Table 2 lists photometric metallicities for early A- and F-type stars.
The new metallicity calibrations are almost unaffected by the
reddening in this spectral type range.
Finally, we provide open cluster metallicities based on Geneva data in
table 3.
These results are combined with other photometric estimates to derive
weighted mean metallicities, an update of the list by Netopil et al.,
2016, Cat. J/A+A/585/150.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 104 3267 Mean photometric metallicities for dwarf stars
table2.dat 86 1226 Geneva metallicities for A to F-type stars
table3.dat 83 54 Open cluster metallicities
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See also:
J/A+A/561/A93 : On the metallicity of open clusters. II. (Heiter+, 2014)
J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Simbad Identifier
13- 18 I6 --- HIP Hipparcos number
20- 28 F9.5 deg RAdeg Right Ascension, ICRS, epoch=J2000
30- 38 F9.5 deg DEdeg Declination, ICRS, epoch=J2000
40- 45 F6.3 mag Vmag Geneva V magnitude
47- 51 F5.3 mag U-B Geneva photometric index U-B
53- 57 F5.3 mag B2-V1 Geneva photometric index B2-V1
59- 64 F6.3 mag B2-G Geneva photometric index B2-G
66- 71 F6.3 mag B1-B2 Geneva photometric index B1-B2
73- 77 F5.3 mag E(B-V) Reddening (1)
79- 82 F4.2 [cm/s2] logg Surface gravity (1)
84- 87 I4 K Teff Effective temperature (1)
89- 93 F5.2 [Sun] [Fe/H]G Metallicity based on Geneva data
95- 99 F5.2 [Sun] [Fe/H] Mean photometric metallicity (2)
101-104 F4.2 [Sun] e_[Fe/H] Standard error of the mean on metallicity
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Note (1): Results by Casagrande et al. (2011A&A...530A.138C 2011A&A...530A.138C)
Note (2): Mean metallicity based on Geneva data and Casagrande et al.
(2011A&A...530A.138C 2011A&A...530A.138C), the latter corrected as described in the paper.
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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- 13 A13 --- Name Identifier
15- 23 F9.5 deg RAdeg Right Ascension, ICRS, epoch=J2000
25- 33 F9.5 deg DEdeg Declination, ICRS, epoch=J2000
35- 45 A11 --- SpType Spectral type from the literature
47- 52 F6.3 mag Vmag Geneva V magnitude
54- 59 F6.3 mag B1-B2 Geneva photometric index B1-B2
61- 66 F6.3 mag B2-V1 Geneva photometric index B2-V1
68- 71 F4.2 mag E(B-V) Reddening
73 I1 --- f_E(B-V) [1/3] Reddening source (1)
75- 80 F6.3 mag Deltam2 Blanketing parameter in the Geneva system
82- 86 F5.2 [Sun] [Fe/H] Metallicity based on Geneva data
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Note (1): Reddening source as follows:
1 = Casagrande et al. (2011A&A...530A.138C 2011A&A...530A.138C)
2 = own determination based on uvby data
3 = estimate by using spectral type and intrinsic colours
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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- 11 A11 --- Name Open cluster Identifier
13- 19 F7.3 deg RAdeg Right Ascension, ICRS, epoch=J2000
21- 27 F7.3 deg DEdeg Declination, ICRS, epoch=J2000
29- 33 F5.2 [Sun] [Fe/H]d ? Metallicity based on dwarf stars
35- 38 F4.2 [Sun] s_[Fe/H]d ? Error on [Fe/H]d
40- 41 I2 --- o_[Fe/H]d ? Number of stars used for [Fe/H]d
43- 47 F5.2 [Sun] [Fe/H]g ? Metallicity based on giant stars
49- 52 F4.2 [Sun] s_[Fe/H]g ? Error on [Fe/H]g
54- 55 I2 --- o_[Fe/H]g ? Number of stars used for [Fe/H]g
57- 60 F4.2 mag E(B-V) Open cluster reddening
62- 66 A5 --- f_E(B-V) Reddening source (1)
68- 72 F5.2 [Sun] [Fe/H] Weighted mean photometric metallicity (2)
74- 77 F4.2 [Sun] s_[Fe/H] ? Error on weighted mean metallicity
79- 81 F3.1 --- w_[Fe/H] Total weight of the mean metallicity
83 I1 --- o_[Fe/H] Number of photometric estimates for [Fe/H]
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Note (1): Reddening source as follows:
G = own determination based on Geneva photometry
T97 = Twarog et al., 1997AJ....114.2556T 1997AJ....114.2556T
NP13 = Netopil & Paunzen, 2013A&A...557A..10N 2013A&A...557A..10N, Cat. J/A+A/557/A10
ST = spectroscopic temperature and colour-temperature relation
[1] = Claria et al., 2003A&A...399..543C 2003A&A...399..543C, Cat. J/A+A/399/543
[2] = Claria et al., 1996PASP..108..672C 1996PASP..108..672C
[3] = Reddy et al., 2015MNRAS.450.4301R 2015MNRAS.450.4301R
[4] = Reddy et al., 2013MNRAS.431.3338R 2013MNRAS.431.3338R, Cat. J/MNRAS/431/3338
[5] = Lapasset et al., 2000A&A...361..945L 2000A&A...361..945L, Cat. J/A+A/361/945.
downscaled for giants
[6] = Santos et al., 2009A&A...493..309S 2009A&A...493..309S
[7] = Molenda-Zakowicz et al., 2014MNRAS.445.2446M 2014MNRAS.445.2446M
Note (2): Update of the list by Netopil et al., 2016A&A...585A.150N 2016A&A...585A.150N,
Cat. J/A+A/585/A150
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Acknowledgements:
Martin Netopil, martin.netopil(at)univie.ac.at
(End) Martin Netopil [Vienna University], Patricia Vannier [CDS] 14-Jun-2017