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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28371
Title: The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration
Authors: RANDICH, Maria Sofia 
Tognelli, E.
Jackson, R.
Jeffries, R. D.
Degl'Innocenti, S.
PANCINO, ELENA 
RE FIORENTIN, Paola 
SPAGNA, Alessandro 
SACCO, GIUSEPPE GERMANO 
BRAGAGLIA, Angela 
MAGRINI, LAURA 
Prada Moroni, P. G.
Alfaro, E.
FRANCIOSINI, Elena 
MORBIDELLI, LORENZO 
Roccatagliata, V.
Bouy, H.
Bravi, L.
Jiménez-Esteban, F. M.
Jordi, C.
Zari, E.
Tautvaišiene, G.
Drazdauskas, A.
Mikolaitis, S.
Gilmore, G.
Feltzing, S.
VALLENARI, Antonella 
Bensby, T.
Koposov, S.
Korn, A.
Lanzafame, Alessandro Carmelo 
Smiljanic, R.
Bayo, A.
Carraro, G.
Costado, M. T.
Heiter, U.
Hourihane, A.
Jofré, P.
Lewis, J.
Monaco, L.
PRISINZANO, Loredana 
Sbordone, L.
Sousa, S. G.
Worley, C. C.
ZAGGIA, Simone 
Issue Date: 2018
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 612
First Page: A99
Abstract: Context. Determination and calibration of the ages of stars, which heavily rely on stellar evolutionary models, are very challenging, while representing a crucial aspect in many astrophysical areas. <BR /> Aims: We describe the methodologies that, taking advantage of Gaia-DR1 and the Gaia-ESO Survey data, enable the comparison of observed open star cluster sequences with stellar evolutionary models. The final, long-term goal is the exploitation of open clusters as age calibrators. <BR /> Methods: We perform a homogeneous analysis of eight open clusters using the Gaia-DR1 TGAS catalogue for bright members and information from the Gaia-ESO Survey for fainter stars. Cluster membership probabilities for the Gaia-ESO Survey targets are derived based on several spectroscopic tracers. The Gaia-ESO Survey also provides the cluster chemical composition. We obtain cluster parallaxes using two methods. The first one relies on the astrometric selection of a sample of bona fide members, while the other one fits the parallax distribution of a larger sample of TGAS sources. Ages and reddening values are recovered through a Bayesian analysis using the 2MASS magnitudes and three sets of standard models. Lithium depletion boundary (LDB) ages are also determined using literature observations and the same models employed for the Bayesian analysis. <BR /> Results: For all but one cluster, parallaxes derived by us agree with those presented in Gaia Collaboration (2017, A&A, 601, A19), while a discrepancy is found for NGC 2516; we provide evidence supporting our own determination. Inferred cluster ages are robust against models and are generally consistent with literature values. <BR /> Conclusions: The systematic parallax errors inherent in the Gaia DR1 data presently limit the precision of our results. Nevertheless, we have been able to place these eight clusters onto the same age scale for the first time, with good agreement between isochronal and LDB ages where there is overlap. Our approach appears promising and demonstrates the potential of combining Gaia and ground-based spectroscopic datasets. <P />Based on observations collected with the FLAMES instrument at VLT/UT2 telescope (Paranal Observatory, ESO, Chile), for the Gaia-ESO Large Public Spectroscopic Survey (188.B-3002, 193.B-0936).Additional tables are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/612/A99">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/612/A99
URI: http://hdl.handle.net/20.500.12386/28371
URL: https://www.aanda.org/articles/aa/abs/2018/04/aa31738-17/aa31738-17.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201731738
Bibcode ADS: 2018A&A...612A..99R
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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