Access to Astronomical Catalogues

← Click to display the menu
J/A+A/499/737 Abundances of microlensed dwarf and subgiant stars (Bensby+, 2009)

Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. Detailed abundance analysis of OGLE-2008-BLG-209S. Bensby T., Johnson J.A., Cohen J., Feltzing S., Udalski A., Gould A., Huang W., Thompson I., Simmerer J., Aden D. <Astron. Astrophys. 499, 737 (2009)> =2009A&A...499..737B
ADC_Keywords: Gravitational lensing ; Abundances ; Equivalent widths Keywords: gravitational lensing - Galaxy: bulge - Galaxy: formation - Galaxy: evolution - stars: abundances - stars: fundamental parameters Abstract: We present a detailed elemental abundance analysis of OGLE-2008-BLG-209S, the source star of a new microlensing event towards the Bulge, for which we obtained a high-resolution spectrum with the MIKE spectrograph on the Magellan Clay telescope. We have performed four different analyses of OGLE-2008-BLG-209S. One method is identical to the one used for a large comparison sample of F and G dwarf stars, mainly thin and thick disc stars, in the Solar neighbourhood. We have also re-analysed three previous microlensed dwarf stars OGLE-2006-BLG-265S, MOA-2006-BLG-099S, and OGLE-2007-BLG-349S with the same method. This homogeneous data set, although small, enables a direct comparison between the different stellar populations. Description: For each spectral line we give the log g value, lower excitation potential, measured equivalent widths, derived absolute abundance, abundance normalised to the Sun (on a line-by-line basis) ([X/H]). Objects: ------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------- 18 04 49.9 -29 42 33 Star 209 = EWS 2008-BUL-209 18 07 18.9 -27 47 43 Star 265 = EWS 2006-BUL-265 17 54 11.0 -35 13 38 Star 099 = MOA 2006-BLG-99 18 05 24.4 -26 25 19 Star 349 = EWS 2007-BUL-349 ------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 106 460 Equivalent width measurements and elemental abundances for OGLE-2008-BLG-209S, OGLE-2006-BLG-265S, MOA-2006-BLG-099S, and OGLE-2007-BLG-349S
See also: J/ApJ/655/L33 : High-resolution spectrum of OGLE-2006-BLG-265 (Johnson+, 2007) J/A+A/512/A41 : Abundances of microlensed stars in the Bulge (Bensby+, 2010) J/A+A/533/A134 : Abundances of microlensed stars in the Bulge (Bensby+, 2011) ftp://sirius.astrouw.edu.pl/ogle/ogle3/ews/ : OGLE EWS Home Page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- El Element 4 I1 --- Ion Neutral or ionised element 6- 13 F8.3 0.1nm lambda Wavelength 15- 19 F5.2 --- loggf Oscillator strength 21- 25 F5.2 eV EP Lower excitation potential 27- 31 F5.1 0.1pm EWsun Sun measured equivalent width 33- 36 F4.2 --- A(Sun) Sun absolute abundance (log scale, A(H)=12) 38 I1 --- f_A(Sun) [0,1] 0 if line not directly measured (1) 40- 44 F5.1 0.1pm EW209 ? OGLE-2009-BLG-209S Measured equivalent width 46- 49 F4.2 --- A(209) ? OGLE-2009-BLG-209S Absolute abundance 51- 55 F5.2 [Sun] [X/H]209 ? OGLE-2009-BLG-209S Normalised abundance 57- 61 F5.1 0.1pm EW265 ? OGLE-2006-BLG-265S Measured equivalent width 63- 66 F4.2 --- A(265) ? OGLE-2006-BLG-265S Absolute abundance 68- 72 F5.2 [Sun] [X/H]265 ? OGLE-2006-BLG-265S Normalised abundance 74- 78 F5.1 0.1pm EW099 ? MOA-2006-BLG-099S Measured equivalent width 80- 83 F4.2 --- A(099) ? MOA-2006-BLG-099S Absolute abundance 85- 89 F5.2 [Sun] [X/H]099 ? MOA-2006-BLG-099S Normalised abundance 91- 95 F5.1 0.1pm EW349 ? OGLE-2007-BLG-349S Measured equivalent with 97-100 F4.2 --- A(349) ? OGLE-2007-BLG-349S Absolute abundance 102-106 F5.2 [Sun] [X/H]349 ? OGLE-2007-BLG-349S Normalised abundance
Note (1): The value 0 indicates a line not measured in the solar spectrum and that the abundance given (and used in the normalisation) for that line is the average abundance based on all the other lines, that could be measured in the solar spectrum, of the same species.
Acknowledgements: Thomas Bensby, tbensby(at)eso.org References: Bensby et al., Paper II 2010A&A...512A..41B, Cat. J/A+A/512/A41 Bensby et al., Paper III 2010A&A...521L..57B Bensby et al., Paper IV 2011A&A...533A.134B, Cat. J/A+A/533/A134
(End) Thomas Bensby [ESO, Chile], Patricia Vannier [CDS] 03-Apr-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact