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 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:
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FileName Lrecl Records Explanations
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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
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Note on table3.dat: The lower part of the table includes the stars from Bensby
et al. (2010, Cat. J/A+A/512/A41).
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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
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Bytes Format Units Label Explanations
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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
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Note (1): Read from the fits headers of the spectra (the direction where the
telescope pointed during observation).
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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- 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
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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- 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)
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Note (1): Based on the colour-[Fe/H]-Teff calibrations by Casagrande et al.
(2010, Cat. J/A+A/512/A54)
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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- 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
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Thomas Bensby, tbensby(at)astro.lu.se
References:
Bensby et al., Paper I 2009A&A...499..737B 2009A&A...499..737B, Cat. J/A+A/499/737
Bensby et al., Paper II 2010A&A...512A..41B 2010A&A...512A..41B, Cat. J/A+A/512/A41
Bensby et al., Paper III 2010A&A...521L..57B 2010A&A...521L..57B
(End) Thomas Bensby [Lund Obs., Sweden], Patricia Vannier [CDS] 08-Aug-2011