J/A+A/512/A41 Abundances of microlensed stars in the Bulge (Bensby+, 2010)
Chemical evolution of the Galactic bulge as traced by microlensed dwarfs and
subgiant stars.
II. Ages, metallicities, detailed elemental abundances, and connections to the
Galactic thick disc.
Bensby T., Feltzing S., Johnson J.A., Gould A., Aden D., Asplund M.,
Melendez J., Gal-Yam A., Lucatello S., Sana H., Sumi T., Miyake N.,
Suzuki N., Han C., Bond I., Udalski A.
<Astron. Astrophys. 512, A41 (2010)>
=2010A&A...512A..41B 2010A&A...512A..41B
ADC_Keywords: Gravitational lensing ; Abundances ; Equivalent widths
Keywords: gravitational lensing - Galaxy: bulge - Galaxy: formation -
Galaxy: evolution - Galaxy: disk - 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 15 Summary of the so far 15 dwarf star microlensing
events in the Bulge that have been observed
with high-resolution spectrographs
table4.dat 169 391 Equivalent widths and absolute abundances for
individual lines (for 8 stars)
table5.dat 334 13 Abundances and uncertainties for each star
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See also:
J/A+A/499/737 : Abundances of microlensed dwarf & subgiants (Bensby+ 2009)
J/A+A/533/A134 : Abundances of microlensed stars in the Bulge (Bensby+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Star name
20 A1 -- n_Name [*] indicates the star MACHO 109.20893.3423
21 A1 --- EW [a] a for stars with data in table4
22 A1 --- Ab [+] + for stars with data in table5
24- 25 I2 h RAh Right ascension (J2000)
27- 28 I2 min RAm Right ascension (J2000)
30- 33 F4.1 s RAs Right ascension (J2000)
35 A1 --- DE- Declination sign (J2000)
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 45 F4.1 arcsec DEs Declination (J2000)
47- 51 F5.2 deg GLON [-90/90] Galactic longitude
53- 57 F5.2 deg GLAT Galactic latitude
59- 63 F5.1 d TE Duration of the event
65- 71 F7.2 d Tmax Time when maximum magnification occured
(HJD-2450000)
73- 76 I4 --- Amax Maximum magnification
78- 85 F8.3 d Tobs Time when event was observed with
high-resolution spectrograph (MJD)
87- 91 I5 s Texp Exposure time
93- 94 I2 --- S/N Measured signal-to-noise ratio per pixel
at ∼6400Å
96-100 A5 --- Spec Spectrograph used
102-106 I5 --- R Spectral resolution
108-111 A4 --- Ref Reference where the star first appeared (2)
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Note (2): References as follows:
TW = This work
B09a = Bensby et al. (2009ApJ...699L.174B 2009ApJ...699L.174B)
B09b = Bensby et al. (2009, Cat. <J/A+A/499/737)
J07 = Johnson et al. (2007, Cat. J/ApJ/655/L33)
J08 = Johnson et al. (2008ApJ...685..508J 2008ApJ...685..508J)
C08 = Cohen et al. (2008ApJ...682.1029C 2008ApJ...682.1029C)
C09 = Cohen et al. (2009ApJ...699...66C 2009ApJ...699...66C)
C03 = Cavallo et al. (2003, SPIE Conf. Ser., 4834, 66)
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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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2- 3 A2 --- El Element
5 I1 --- Ion Ionisation (1=neutral)
11- 18 F8.3 0.1nm lambda Wavelength
22- 25 F4.2 eV LEP Lower Excitation Potential
29- 33 F5.1 0.1pm EWsun Solar equivalent width of the element
37- 40 F4.2 [---] A(Sun) Solar absolute abundance (log scale, A(H)=12)
49 I1 --- f_A(Sun) [0,1] 0 if line measured and used,
1 if average abundance from other lines used
53- 57 F5.1 0.1pm EW(076S) ? Equivalent width OGLE-2009-BLG-076S
61- 64 F4.2 [---] A(076S) ? Absolute abundance OGLE-2009-BLG-076S
68- 72 F5.1 0.1pm EW(493S) ? Equivalent width MOA-2009-BLG-493S
76- 79 F4.2 [---] A(493S) ? Absolute abundance MOA-2009-BLG-493S
83- 87 F5.1 0.1pm EW(133S) ? Equivalent width MOA-2009-BLG-133S
91- 94 F4.2 [---] A(133S) ? Absolute abundance MOA-2009-BLG-133S
98-102 F5.1 0.1pm EW(475S) ? Equivalent width MOA-2009-BLG-475S
106-109 F4.2 [---] A(475S) ? Absolute abundance MOA-2009-BLG-475S
113-117 F5.1 0.1pm EW(022S) ? Equivalent width MACHO-1999-BLG-022S
121-124 F4.2 [---] A(022S) ? Absolute abundance MACHO-1999-BLG-022S
128-132 F5.1 0.1pm EW(489S) ? Equivalent width MOA-2009-BLG-489S
136-139 F4.2 [---] A(489S) ? Absolute abundance MOA-2009-BLG-489S
143-147 F5.1 0.1pm EW(456S) ? Equivalent width MOA-2009-BLG-456S
151-154 F4.2 [---] A(456S) ? Absolute abundance MOA-2009-BLG-456S
158-162 F5.1 0.1pm EW(259S) ? Equivalent width MOA-2009-BLG-259S
166-169 F4.2 [---] A(259S) ? Absolute abundance MOA-2009-BLG-259S
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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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1- 19 A19 --- Name Star name
22- 26 F5.2 [Sun] [Fe/H] Normalised abundance
28- 32 F5.2 [Sun] [O/Fe] ? Normalised abundance (not NLTE corrected)
34- 38 F5.2 [Sun] [Na/Fe] ? Normalised abundance
40- 44 F5.2 [Sun] [Mg/Fe] Normalised abundance
46- 50 F5.2 [Sun] [Al/Fe] Normalised abundance
52- 56 F5.2 [Sun] [Si/Fe] Normalised abundance
58- 62 F5.2 [Sun] [Ca/Fe] Normalised abundance
64- 68 F5.2 [Sun] [Ti/Fe] Normalised abundance
70- 74 F5.2 [Sun] [Cr/Fe] ? Normalised abundance
76- 80 F5.2 [Sun] [Ni/Fe] Normalised abundance
82- 86 F5.2 [Sun] [Zn/Fe] ? Normalised abundance
88- 92 F5.2 [Sun] [Y/Fe] ? Normalised abundance
94- 98 F5.2 [Sun] [Ba/Fe] Normalised abundance
105-108 F4.2 [Sun] e_[Fe/H] ? Error in abundance ratio
111-114 F4.2 [Sun] e_[O/Fe] ? Error in abundance ratio
117-120 F4.2 [Sun] e_[Na/Fe] ? Error in abundance ratio
123-126 F4.2 [Sun] e_[Mg/Fe] ? Error in abundance ratio
129-132 F4.2 [Sun] e_[Al/Fe] ? Error in abundance ratio
135-138 F4.2 [Sun] e_[Si/Fe] ? Error in abundance ratio
141-144 F4.2 [Sun] e_[Ca/Fe] ? Error in abundance ratio
147-150 F4.2 [Sun] e_[Ti/Fe] ? Error in abundance ratio
153-156 F4.2 [Sun] e_[Cr/Fe] ? Error in abundance ratio
159-162 F4.2 [Sun] e_[Ni/Fe] ? Error in abundance ratio
165-168 F4.2 [Sun] e_[Zn/Fe] ? Error in abundance ratio
171-174 F4.2 [Sun] e_[Y/Fe] ? Error in abundance ratio
177-180 F4.2 [Sun] e_[Ba/Fe] ? Error in abundance ratio
187-190 F4.2 [Sun] e_[Fe/H]r ? Error in abundance ratio (repeated)
193-196 F4.2 [Sun] e_[O/H] ? Error in abundance ratio
199-202 F4.2 [Sun] e_[Na/H] ? Error in abundance ratio
205-208 F4.2 [Sun] e_[Mg/H] ? Error in abundance ratio
211-214 F4.2 [Sun] e_[Al/H] ? Error in abundance ratio
217-220 F4.2 [Sun] e_[Si/H] ? Error in abundance ratio
223-226 F4.2 [Sun] e_[Ca/H] ? Error in abundance ratio
229-232 F4.2 [Sun] e_[Ti/H] ? Error in abundance ratio
235-238 F4.2 [Sun] e_[Cr/H] ? Error in abundance ratio
241-244 F4.2 [Sun] e_[Ni/H] ? Error in abundance ratio
247-250 F4.2 [Sun] e_[Zn/H] ? Error in abundance ratio
253-256 F4.2 [Sun] e_[Y/H] ? Error in abundance ratio
259-262 F4.2 [Sun] e_[Ba/H] ? Error in abundance ratio
267-269 I3 --- n(Fe) ? Number of Fe lines used
272-274 I3 --- n(O) ? Number of O lines used
277-279 I3 --- n(Na) ? Number of Na lines used
282-284 I3 --- n(Mg) ? Number of Mg lines used
287-289 I3 --- n(Al) ? Number of Al lines used
293-295 I3 --- n(Si) ? Number of Si lines used
299-301 I3 --- n(Ca) ? Number of Ca lines used
305-307 I3 --- n(Ti) ? Number of Ti lines used
311-313 I3 --- n(Cr) ? Number of Cr lines used
317-319 I3 --- n(Ni) ? Number of Ni lines used
322-324 I3 --- n(Zn) ? Number of Zn lines used
327-329 I3 --- n(Y) ? Number of Y lines used
332-334 I3 --- n(Ba) ? Number of Ba lines used
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Acknowledgements:
Thomas Bensby, tbensby(at)eso.org
History:
* 19-Jan-2010: Original version
* 02-Jun-2010: the star name "MOA-2008-BLG-099S" has been
corrected in table5 into "MOA-2006-BLG-099S"
References:
Bensby et al., Paper I 2009A&A...499..737B 2009A&A...499..737B, Cat. J/A+A/499/737
Bensby et al., Paper III 2010A&A...521L..57B 2010A&A...521L..57B
Bensby et al., Paper IV 2011A&A...533A.134B 2011A&A...533A.134B, Cat. J/A+A/533/A134
(End) Thomas Bensby [ESO, Chile], Patricia Vannier [CDS] 19-Jan-2010