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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 (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). 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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Note (1): Results by Casagrande et al. (2011A&A...530A.138C) Note (2): Mean metallicity based on Geneva data and Casagrande et al. (2011A&A...530A.138C), the latter corrected as described in the paper.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Note (1): Reddening source as follows: 1 = Casagrande et al. (2011A&A...530A.138C) 2 = own determination based on uvby data 3 = estimate by using spectral type and intrinsic colours
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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]
Note (1): Reddening source as follows: G = own determination based on Geneva photometry T97 = Twarog et al., 1997AJ....114.2556T NP13 = Netopil & Paunzen, 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, Cat. J/A+A/399/543 [2] = Claria et al., 1996PASP..108..672C [3] = Reddy et al., 2015MNRAS.450.4301R [4] = Reddy et al., 2013MNRAS.431.3338R, Cat. J/MNRAS/431/3338 [5] = Lapasset et al., 2000A&A...361..945L, Cat. J/A+A/361/945. downscaled for giants [6] = Santos et al., 2009A&A...493..309S [7] = Molenda-Zakowicz et al., 2014MNRAS.445.2446M Note (2): Update of the list by Netopil et al., 2016A&A...585A.150N, Cat. J/A+A/585/A150
Acknowledgements: Martin Netopil, martin.netopil(at)univie.ac.at
(End) Martin Netopil [Vienna University], Patricia Vannier [CDS] 14-Jun-2017
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