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J/A+A/533/A134      Abundances of microlensed stars in the Bulge (Bensby+, 2011)

Chemical evolution of the Galactic bulge as traced by microlensed dwarfs and subgiant stars. IV. Two bulge populations. Bensby, T., Aden, D., Melendez, J., Gould, A., Feltzing, S., Asplund, M., Johnson, J.A., Lucatello, S., Yee, J.C., Ramirez, I., Cohen, J.G., Thompson, I., Gal-Yam, A., Han C., Sumi, T., Suzuki D., Wada K., Miyake N., Furusawa K., Ohmori K., Saito To., Tristram P., Bennett D. <Astron. Astrophys. 533, A134 (2011)> =2011A&A...533A.134B
ADC_Keywords: Gravitational lensing ; Abundances ; Equivalent widths Keywords: gravitational lensing - Galaxy: bulge - Galaxy: formation - Galaxy: evolution - stars: abundances Abstract: We perform a detailed elemental abundance analysis of dwarf stars in the Galactic bulge, based on high-resolution spectra that were obtained while the stars were optically magnified during gravitational microlensing events. The analysis method is the same as for a large sample of F and G dwarf stars in the Solar neighbourhood, enabling a fully differential comparison between the Bulge and the local stellar populations in the Galactic disc. Description: For each spectral line we give the lower excitation potential, measured equivalent widths, and derived absolute abundances. We also give median abundances for each star, normalised to the Sun, and errors in the median abundances. These tables contain data for the last 12 microlensed dwarf stars. Data for the first 14 microlensed dwarfs can be found in Bensby et al. (2009, Cat. J/A+A/499/737) and Bensby et al. (2010, Cat. J/A+A/512/A41). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 102 12 Summary of the twelve microlensing events in the Bulge presented in this study table2.dat 71 12 Stellar parameters and radial velocities for the 12 new microlensed dwarf stars table3.dat 114 26 *Stellar ages and a comparison of colours and effective temperatures as determined from spectroscopy and microlensing techniques for all 26 microlensed dwarf stars table4.dat 212 12 Abundances and uncertainties for each star table5.dat 166 431 Equivalent widths and absolute abundances for individual lines
Note on table3.dat: The lower part of the table includes the stars from Bensby et al. (2010, Cat. J/A+A/512/A41).
See also: J/A+A/415/155 : Oxygen abundances in the Galactic disk (Bensby+, 2004) J/A+A/499/737 : Abundances of microlensed dwarf & subgiant stars (Bensby+ 2009) J/A+A/512/A41 : Abundances of microlensed stars in the Bulge (Bensby+, 2010) J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Name Star name 19- 20 I2 h RAh Right ascension (J2000) (1) 22- 23 I2 min RAm Right ascension (J2000) (1) 25- 29 F5.2 s RAs Right ascension (J2000) (1) 31 A1 --- DE- Declination sign (J2000) (1) 32- 33 I2 deg DEd Declination (J2000) (1) 35- 36 I2 arcmin DEm Declination (J2000) (1) 38- 42 F5.2 arcsec DEs Declination (J2000) (1) 44- 48 F5.2 deg GLON [-90/90] Galactic longitude 50- 54 F5.2 deg GLAT Galactic latitude 56- 57 I2 d Dt ?=- Duration of the event 59- 67 F9.4 d t.max Time when maximum magnification occured (HJD-2450000) 69- 72 I4 --- Amax ?=- Maximum magnification 74- 81 F8.3 d t.obs Time when event was observed with high-resolution spectrograph (MJD) 83- 86 I4 s t.exp Exposure time 88- 90 I3 --- S/N Measured signal-to-noise ratio per pixel at ∼6400Å 92- 96 A5 --- Spec Spectrograph used 98-102 I5 --- R Spectral resolution
Note (1): Read from the fits headers of the spectra (the direction where the telescope pointed during observation).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Name Star name 19- 22 I4 K Teff Effective temperature 24- 26 I3 K e_Teff rms uncertainty on Teff 28- 31 F4.2 [cm/s2] logg Surface gravity 33- 36 F4.2 [cm/s2] e_logg rms uncertainty on logg 38- 41 F4.2 km/s vt Microturbulence parameter 43- 46 F4.2 km/s e_vt rms uncertainty on vt 48- 52 F5.2 [Sun] [Fe/H] Metallicity 54- 57 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H] 59- 61 I3 --- n(FeI) Number of FeI lines used in the analysis 63- 64 I2 --- n(FeII) Number of FeII lines used in the analysis 66- 71 F6.1 km/s RV Radial velocity
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Name Object name 21- 24 I4 K Teff Effective temperature 26- 29 F4.2 Msun M Stellar mass (inferred from isochrones) 31- 35 F5.2 [Lsun] logL Luminosity (inferred from isochrones) 37- 40 F4.1 Gyr Age Age (inferred from isochrones) 42- 44 F3.1 Gyr b_Age 1-sigma lower estimate of Age 46- 49 F4.1 Gyr B_Age 1-sigma upper estimate of Age 51- 54 F4.2 mag (V-I)0 Deredenned V-I colour index (1) 56- 59 F4.2 mag VMAG Absolute V magnitude based on the spectroscopic stellar parameters 61- 64 F4.2 mag b_VMAG 1-sigma lower estimate of VMAG 66- 69 F4.2 mag B_VMAG 1-sigma upper estimate of VMAG 71- 74 F4.2 mag IMAG ?=- Absolute I magnitude based on spectroscopic stellar parameters 76- 79 F4.2 mag IMAGm ?=- Absolute I magnitude (based on microlensing technique) 81- 84 F4.2 mag (V-I)0m ?=- Deredenned V-I colour index (based on microlensing technique) 86- 89 I4 K Teffm ?=- Inferred effective temperature (based on microlensing technique) (1) 91-114 A24 --- Com Comments ("DR" = for differential reddening)
Note (1): Based on the colour-[Fe/H]-Teff calibrations by Casagrande et al. (2010, Cat. J/A+A/512/A54)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Name Star name 19- 23 F5.2 [Sun] [Fe/H] Normalised abundance 25- 29 F5.2 [Sun] [O/Fe] Normalised abundance (not NLTE corrected) 31- 35 F5.2 [Sun] [Na/Fe] Normalised abundance 37- 41 F5.2 [Sun] [Mg/Fe] Normalised abundance 43- 47 F5.2 [Sun] [Al/Fe] Normalised abundance 49- 53 F5.2 [Sun] [Si/Fe] Normalised abundance 55- 59 F5.2 [Sun] [Ca/Fe] Normalised abundance 61- 65 F5.2 [Sun] [Ti/Fe] Normalised abundance 67- 71 F5.2 [Sun] [Cr/Fe] ? Normalised abundance 73- 77 F5.2 [Sun] [Ni/Fe] Normalised abundance 79- 83 F5.2 [Sun] [Zn/Fe] ? Normalised abundance 85- 89 F5.2 [Sun] [Y/Fe] ? Normalised abundance 91- 95 F5.2 [Sun] [Ba/Fe] Normalised abundance 97-100 F4.2 [Sun] e_[Fe/H] ? Error in abundance ratio 102-105 F4.2 [Sun] e_[O/Fe] ? Error in abundance ratio 107-110 F4.2 [Sun] e_[Na/Fe] ? Error in abundance ratio 112-115 F4.2 [Sun] e_[Mg/Fe] ? Error in abundance ratio 117-120 F4.2 [Sun] e_[Al/Fe] ? Error in abundance ratio 122-125 F4.2 [Sun] e_[Si/Fe] ? Error in abundance ratio 127-130 F4.2 [Sun] e_[Ca/Fe] ? Error in abundance ratio 132-135 F4.2 [Sun] e_[Ti/Fe] ? Error in abundance ratio 137-140 F4.2 [Sun] e_[Cr/Fe] ? Error in abundance ratio 142-145 F4.2 [Sun] e_[Ni/Fe] ? Error in abundance ratio 147-150 F4.2 [Sun] e_[Zn/Fe] ? Error in abundance ratio 152-155 F4.2 [Sun] e_[Y/Fe] ? Error in abundance ratio 157-160 F4.2 [Sun] e_[Ba/Fe] ? Error in abundance ratio 162-164 I3 --- n(Fe) ? Number of Fe lines used 166-168 I3 --- n(O) ? Number of O lines used 170-172 I3 --- n(Na) ? Number of Na lines used 174-176 I3 --- n(Mg) ? Number of Mg lines used 178-180 I3 --- n(Al) ? Number of Al lines used 182-184 I3 --- n(Si) ? Number of Si lines used 186-188 I3 --- n(Ca) ? Number of Ca lines used 190-192 I3 --- n(Ti) ? Number of Ti lines used 194-196 I3 --- n(Cr) ? Number of Cr lines used 198-200 I3 --- n(Ni) ? Number of Ni lines used 202-204 I3 --- n(Zn) ? Number of Zn lines used 206-208 I3 --- n(Y) ? Number of Y lines used 210-212 I3 --- n(Ba) ? Number of Ba lines used
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
2- 3 A2 --- El Element 5 I1 --- Ion Ionisation (1=neutral) 7- 14 F8.3 0.1nm lambda Wavelength 16- 19 F4.2 eV LEP Lower Excitation Potential 21- 25 F5.1 0.1pm Wsun Equivalent width Sun 27- 30 F4.2 [---] A(Sun) Sun absolute abundance (log scale, A(H)=12) 34 I1 --- f_A(Sun) [0,1] 0 if line measured and used, 1 if average abundance from other lines used 36- 40 F5.1 0.1pm W(174S) ? Equivalent width MOA-2009-BLG-174S 42- 45 F4.2 [---] A(174S) ? Absolute abundance MOA-2009-BLG-174S 47- 51 F5.1 0.1pm W(259S) ? Equivalent width MOA-2009-BLG-259S 53- 56 F4.2 [---] A(259S) ? Absolute abundance MOA-2009-BLG-259S 58- 62 F5.1 0.1pm W(037S) ? Equivalent width MOA-2010-BLG-037S 64- 67 F4.2 [---] A(037S) ? Absolute abundance MOA-2010-BLG-037S 69- 73 F5.1 0.1pm W(049S) ? Equivalent width MOA-2010-BLG-049S 75- 78 F4.2 [---] A(049S) ? Absolute abundance MOA-2010-BLG-049S 80- 84 F5.1 0.1pm W(078S) ? Equivalent width MOA-2010-BLG-078S 86- 89 F4.2 [---] A(078S) ? Absolute abundance MOA-2010-BLG-078S 91- 95 F5.1 0.1pm W(167S) ? Equivalent width MOA-2010-BLG-167S 97-100 F4.2 [---] A(167S) ? Absolute abundance MOA-2010-BLG-167S 102-106 F5.1 0.1pm W(285S) ? Equivalent width MOA-2010-BLG-285S 108-111 F4.2 [---] A(285S) ? Absolute abundance MOA-2010-BLG-285S 113-117 F5.1 0.1pm W(311S) ? Equivalent width MOA-2010-BLG-311S 119-122 F4.2 [---] A(311S) ? Absolute abundance MOA-2010-BLG-311S 124-128 F5.1 0.1pm W(446S) ? Equivalent width MOA-2010-BLG-446S 130-133 F4.2 [---] A(446S) ? Absolute abundance MOA-2010-BLG-446S 135-139 F5.1 0.1pm W(523S) ? Equivalent width MOA-2010-BLG-523S 141-144 F4.2 [---] A(523S) ? Absolute abundance MOA-2010-BLG-523S 146-150 F5.1 0.1pm W(034S) ? Equivalent width MOA-2011-BLG-034S 152-155 F4.2 [---] A(034S) ? Absolute abundance MOA-2011-BLG-034S 157-161 F5.1 0.1pm W(058S) ? Equivalent width MOA-2011-BLG-058S 163-166 F4.2 [---] A(058S) ? Absolute abundance MOA-2011-BLG-058S
Acknowledgements: Thomas Bensby, tbensby(at)astro.lu.se References: Bensby et al., Paper I 2009A&A...499..737B, Cat. J/A+A/499/737 Bensby et al., Paper II 2010A&A...512A..41B, Cat. J/A+A/512/A41 Bensby et al., Paper III 2010A&A...521L..57B
(End) Thomas Bensby [Lund Obs., Sweden], Patricia Vannier [CDS] 08-Aug-2011
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