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J/A+A/542/A48       AMBRE project. FEROS archived spectra    (Worley+, 2012)

The AMBRE project: stellar parameterisation of the ESO: FEROS archived spectra. Worley C.C., de Laverny P., Recio-Blanco A., Hill V., Bijaoui A., Ordenovic C. <Astron. Astrophys., 542, A48 (2012)> =2012A&A...542A..48W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, fundamental ; Spectroscopy ; Radial velocities ; Effective temperatures ; Abundances Mission_Name: ESO Keywords: astronomical databases: miscellaneous - stars: fundamental parameters - techniques: spectroscopic - methods: data analysis Abstract: The AMBRE Project is a collaboration between the European Southern Observatory (ESO) and the Observatoire de la Cote d'Azur (OCA) that has been established in order to carry out the determination of stellar atmospheric parameters for the archived spectra of four ESO spectrographs. The analysis of the FEROS archived spectra for their stellar parameters (effective temperatures, surface gravities, global metallicities, alpha element to iron ratios and radial velocities) has been completed in the first phase of the AMBRE Project. From the complete ESO:FEROS archive dataset that was received, a total of 21551 scientific spectra have been identified, covering the period 2005 to 2010. These spectra correspond to 6285 stars. The determination of the stellar parameters was carried out using the stellar parameterisation algorithm, MATISSE (MATrix Inversion for Spectral SynthEsis), which has been developed at OCA to be used in the analysis of large scale spectroscopic studies in galactic archaeology. An analysis pipeline has been constructed that integrates spectral normalisation, cleaning and radial velocity correction procedures in order that the FEROS spectra could be analysed automatically with MATISSE to obtain the stellar parameters. The synthetic grid against which the MATISSE analysis is carried out is currently constrained to parameters of FGKM stars only. Stellar atmospheric parameters, effective temperature, surface gravity, metallicity and alpha element abundances, were determined for 6508 (30.2%) of the FEROS archived spectra (∼3087 stars). Radial velocities were determined for 11963 (56%) of the archived spectra. 2370 (11%) spectra could not be analysed within the pipeline due to very low signal-to-noise ratios or missing spectral orders. 12673 spectra (58.8%) were analysed in the pipeline but their parameters were discarded based on quality criteria and error analysis determined within the automated process. The majority of these rejected spectra were found to have broad spectral features, as probed both by the direct measurement of the features and cross-correlation function breadths, indicating that they may be hot and/or fast rotating stars, which are not considered within the adopted reference synthetic spectra grid. The current configuration of the synthetic spectra grid is devoted to slow-rotating FGKM stars. Hence non-standard spectra (binaries, chemically peculiar stars etc.) that could not be identified may pollute the analysis. Description: This first release concerns the FEROS data collected from 2005, October to 2009, December. The spectra were reduced by ESO with the corresponding automatic pipeline and then sent to the Observatoire de la Cote d'Azur (OCA, Nice) for ingestion into a dedicated pipeline (see paper). All FEROS spectra cover the domain 350nm-920nm at a resolution of about 48000. Before their ingestion into MATISSE, these spectra have been convolved at a lower resolution (Δλ=0.33Å), sliced and resampled (total number of pixels = 11890). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ambredr1.dat 311 18618 Atmospheric Parameters and Chemical Abundances from Stellar Spectra, Version 1
See also: J/A+A/595/A18 : Lithium abundances in AMBRE stars (Guiglion+, 2016) J/A+A/600/A22 : Iron-peak elements in solar neighbourhood (Mikolaitis+, 2017) Byte-by-byte Description of file: ambredr1.dat
Bytes Format Units Label Explanations
1- 29 A29 --- Ident ESO Data set identifier (DP_ID) 31- 55 A25 --- Name Object designation (OBJECT) 57- 81 A25 --- Target Target designation (TARGNAME) 83- 92 F10.6 deg RAdeg Right ascension (J2000) (RAJ2000) 94-102 F9.5 deg DEdeg Delcination (J2000) (DEJ2000) 104-116 F13.7 d MJD Star of observation date (MJD_OBS) 118-127 F10.5 s ExpTime Total integration time (EXPTIME) 129-132 I4 --- SNR ? Signal-to-noise ratio (SNR) 134 A1 --- f_SNR [CR] Quality of SNR estimate (Crude or Refined (SNR_FLAG) 136 A1 --- f_EEmline [TF] T is extreme Emission Line detected -> No analysis (EXTREMEEMISSIONLINE_FLAG) 138 A1 --- f_Emline [TF] T if some Emission Lines detected -> Results uncertain (EMISSIONLINEFLAG) 140-143 F4.2 0.1nm FWHM ? Mean FWHM of absorption lines around 4500Å (MEANFWHM_LINES) 145 A1 --- f_FWHM [TF] T if FWHM outside the accepted range -> Results uncertain (MEANFWHMLINESFLAG) 147-153 F7.2 km/s RV ? Radial velocity (VRAD) 155-163 F9.6 km/s e_RV ? Error on radial velocity (ERR_VRAD) 165-170 F6.2 0.1nm CCFFWHM ? FWHM of the CCF between the spectrum and the binary mask (VRADCCFFWHM) 172 I1 --- q_RV ? Quality of RV 0=very good to 5=very bad (VRAD_FLAG) 174-179 F6.1 K Teff ? Effective temperature (TEFF) 181-185 F5.1 K e_Teff ? Effective temperature internal error (ERRINTTEFF) 187-189 I3 K e_TeffE [120]? Effective temperature external error (ERREXTTEFF) 191-195 F5.3 [cm/s2] logg ? Surface gravity (LOG_G) 197-201 F5.3 [cm/s2] e_logg ? Surface gravity internal error (ERRINTLOG_G) 203-206 F4.2 [cm/s2] e_loggE ? Surface gravity external error (ERREXTLOG_G) 208-216 F9.6 [-] [M/H] ? Mean metallicity (M_H) 218-222 F5.3 [-] e_[M/H] ? Mean metallicity internal error (ERRINTM_H) 224-226 F3.1 [-] e_[M/H]E [0.1]? Mean metallicity external error (ERREXTM_H) 228-236 F9.6 [-] [alpha/Fe] ? Alpha elements over iron abundance (ALPHA) 238-242 F5.3 [-] e_[alpha/Fe] ? Alpha elements over iron abundance internal error (ERRINTALPHA) 244-246 F3.1 [-] e_[alpha/Fe]E [0.1]?Alpha elements over iron abundance external error (ERREXTALPHA) 248-253 F6.3 --- logChi2 ? log(Chi2) between the observed and the reconstructed spectra (CHI2) 255 I1 --- f_logChi2 ? Quality flag on this fit, 0=very good to 2=very bad (CHI2_FLAG) 257-297 A41 --- OrigFile Filename of original spectrum being analysed (ORIGFILE) 299-311 A13 --- ProgID ESO programm identifier (PROG_ID)
Acknowledgements: Copied at http://www.eso.org/qi/catalog/show/13
(End) Patricia Vannier [CDS] 21-Nov-2017
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

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