J/A+A/598/A5 Gaia-ESO Survey iDR4 calibrators (Pancino+, 2017)
The Gaia-ESO Survey: calibration strategy.
Pancino E., Lardo C., Altavilla G., Marinoni S., Ragaini S., Cocozza G.,
Bellazzini M., Sabbi E., Zoccali M., Donati P., Heiter U., Koposov S.E.,
Blomme R., Morel T., Simon-Diaz S., Lobel A., Soubiran C., Montalban J.,
Valentini M., Casey A.R., Blanco-Cuaresma S., Jofre P., Worley C.C.,
Magrini L., Hourihane A., Francois P., Feltzing S., Gilmore G., Randich S.,
Asplund M., Bonifacio P., Drew J.E., Jeffries R.D., Micela G., Vallenari A.,
Alfaro E.J., Allende Prieto C., Babusiaux C., Bensby T., Bragaglia A.,
Flaccomio E., Hambly N., Korn A.J., Lanzafame A.C., Smiljanic R.,
Van Eck S., Walton N.A., Bayo A., Carraro G., Costado M.T., Damiani F.,
Edvardsson B., Franciosini E., Frasca A., Lewis J., Monaco L.,
Morbidelli L., Prisinzano L., Sacco G.G., Sbordone L., Sousa S.G.,
Zaggia S., Koch A. (Gaia-ESO collaboration)
<Astron. Astrophys. 598, A5 (2017)>
=2017A&A...598A...5P 2017A&A...598A...5P (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Abundances ; Radial velocities
Keywords: surveys - Galaxy: general - stars: abundances -
techniques: spectroscopic - techniques: radial velocities
Abstract:
The Gaia-ESO survey (GES) is now in its fifth and last year of
observations and has produced tens of thousands of high-quality
spectra of stars in all Milky Way components. This paper presents the
strategy behind the selection of astrophysical calibration targets,
ensuring that all GES results on radial velocities, atmospheric
parameters, and chemical abundance ratios will be both internally
consistent and easily comparable with other literature results,
especially from other large spectroscopic surveys and from Gaia. The
calibration of GES is particularly delicate because of (i) the large
space of parameters covered by its targets, ranging from dwarfs to
giants, from O to M stars; these targets have a large wide of
metallicities and also include fast rotators, emission line objects,
and stars affected by veiling; (ii) the variety of observing setups,
with different wavelength ranges and resolution; and (iii) the choice
of analyzing the data with many different state-of-the-art methods,
each stronger in a different region of the parameter space, which
ensures a better understanding of systematic uncertainties. An
overview of the GES calibration and homogenization strategy is also
given, along with some examples of the usage and results of
calibrators in GES iDR4, which is the fourth internal GES data release
and will form the basis of the next GES public data release. The
agreement between GES iDR4 recommended values and reference values for
the calibrating objects are very satisfactory. The average offsets and
spreads are generally compatible with the GES measurement errors,
which in iDR4 data already meet the requirements set by the main GES
scientific goals.
Description:
List of GES iDR4 calibrators. It can be used to select the iDR4
calibrators from the upcoming ESO Phase 3 public release. The columns
contain: the GES unique identifier of each star (the CName), based on
the object sexagesimal coordinates; the calibration type, which can be
GC or OC for clusters, RV for radial velocity standards, BM for
benchmark stars, or CR for CoRoT targets; the field name; and the
2MASS J and K magnitudes, when available.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 1970 List of GES iDR4 calibrators
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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- 16 A16 --- CName Unique GES iDR4 target name, based on object
coordinates (HHMMSSss+DDMMSSs) (1)
19- 20 A2 --- Type Calibrator type (2)
23- 34 A12 --- Field Field or object name
36- 41 F6.2 mag Jmag ?=-9.99 J magnitude from 2MASS (3)
43- 48 F6.2 mag Kmag ?=-9.99 K magnitude from 2MASS (3)
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Note (1): No CName for the Sun.
Note (2): Calibrator type has follows:
CR = CoRoT targets
GC = Globular cluster star
OC = Open cluster star
RV = Radial velocity standard star
BM = Gaia benchmark star
Note (3): The 2MASS magnitude is not available for all calibrators.
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Acknowledgements:
Elena Pancino, pancino(at)arcetri.inaf.it
(End) Elena Pancino [INAF-OAA, Italy], Patricia Vannier [CDS] 08-Nov-2016