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A test field for Ga...
A test field for Gaia Radial velocity catalogue of stars in the South Ecliptic Pole
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- Fremat, Y. (author)
- Royal Observ Belgium, 3 Ave Circulaire, B-1180 Brussels, Belgium.
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- Altmann, M. (author)
- Heidelberg Univ, Zentrum Astron, Astronom Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.;UPMC Univ Paris 06, Sorbonne Univ, PSL Res Univ, SYRTE,Observ Paris,CNRS,LNE, 61 Ave Observ, F-75014 Paris, France.
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- Pancino, E. (author)
- INAF, Osservatorio Astron Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy.;ASI Sci Data Ctr, Via Politecn Snc, I-00133 Rome, Italy.
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- Soubiran, C. (author)
- Univ Bordeaux, CNRS, LAB UMR 5804, F-33270 Floirac, France.
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- Jofre, P. (author)
- Univ Bordeaux, CNRS, LAB UMR 5804, F-33270 Floirac, France.;Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.;Univ Diego Port, Fac Ingn, Nucleo Astron, Av Ejercito 441, Santiago, Chile.
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- Damerdji, Y. (author)
- Ctr Rech Astron Astrophys & Geophys, Route Observ,BP 63, Algiers 16340, Algeria.;Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, 19c,Allee 6 Aout, B-4000 Liege, Belgium.
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- Heiter, Ulrike (author)
- Uppsala universitet,Observationell astrofysik
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- Royer, F. (author)
- Univ Paris Diderot, CNRS, Observ Paris, GEPI, Pl Jules Janssen, F-92195 Meudon, France.
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- Seabroke, G. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
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- Sordo, R. (author)
- INAF, Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy.
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- Blanco-Cuaresma, S. (author)
- Univ Geneva, Observ Geneve, CH-1290 Versoix, Switzerland.;Univ Montpellier II, LUPM UMR 5299, CNRS UM2, CC 72, F-34095 Montpellier 05, France.
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- Jasniewicz, G. (author)
- Univ Montpellier II, LUPM UMR 5299, CNRS UM2, CC 72, F-34095 Montpellier 05, France.
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- Martayan, C. (author)
- European Org Astron Res Southern Hemisphere, ESO, Alonso Cordova 3107, Vitacura, Santiago De Chi, Chile.
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- Thevenin, F. (author)
- UCA, Lab Lagrange, OCA, UMR 7293,CS 34229, F-06304 Nice 4, France.
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- Vallenari, A. (author)
- INAF, Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy.
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- Blomme, R. (author)
- Royal Observ Belgium, 3 Ave Circulaire, B-1180 Brussels, Belgium.
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- David, M. (author)
- Univ Antwerp, Onderzoeksgrp Toegepaste Wiskunde, Middelheimlaan 1, B-2020 Antwerp, Belgium.
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Gosset, E. (author)
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- Katz, D. (author)
- Univ Paris Diderot, CNRS, Observ Paris, GEPI, Pl Jules Janssen, F-92195 Meudon, France.
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- Viala, Y. (author)
- Univ Paris Diderot, CNRS, Observ Paris, GEPI, Pl Jules Janssen, F-92195 Meudon, France.
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- Boudreault, S. (author)
- Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Cantat-Gaudin, T. (author)
- INAF, Osservatorio Astron Padova, Vic Osservatorio 5, I-35122 Padua, Italy.
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- Lobel, A. (author)
- Royal Observ Belgium, 3 Ave Circulaire, B-1180 Brussels, Belgium.
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- Meisenheimer, K. (author)
- MPIA, D-69117 Heidelberg, Germany.
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- Nordlander, Thomas (author)
- Uppsala universitet,Teoretisk astrofysik
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- Raskin, G. (author)
- Katholieke Univ Leuven, Afdeling Sterrenkunde, Celestijnenlaan 200d Bus 2401, B-3001 Leuven, Belgium.
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- Royer, P. (author)
- Katholieke Univ Leuven, Afdeling Sterrenkunde, Celestijnenlaan 200d Bus 2401, B-3001 Leuven, Belgium.
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- Zorec, J. (author)
- UPMC Univ Paris 6, Sorbonne Univ, F-75014 Paris, France.;CNRS, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France.
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Royal Observ Belgium, 3 Ave Circulaire, B-1180 Brussels, Belgium Heidelberg Univ, Zentrum Astron, Astronom Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.;UPMC Univ Paris 06, Sorbonne Univ, PSL Res Univ, SYRTE,Observ Paris,CNRS,LNE, 61 Ave Observ, F-75014 Paris, France. (creator_code:org_t)
- 2016-12-19
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 597
- Related links:
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- Context. Gaia is a space mission that is currently measuring the five astrometric parameters, as well as spectrophotometry of at least 1 billion stars to G = 20.7 mag with unprecedented precision. The sixth parameter in phase space (i.e., radial velocity) is also measured thanks to medium-resolution spectroscopy that is being obtained for the 150 million brightest stars. During the commissioning phase, two fields, one around each ecliptic pole, have been repeatedly observed to assess and to improve the overall satellite performances, as well as the associated reduction and analysis software. A ground-based photometric and spectroscopic survey was therefore initiated in 2007, and is still running to gather as much information as possible about the stars in these fields. This work is of particular interest to the validation of the radial velocity spectrometer outputs.Aims. The paper presents the radial velocity measurements performed for the Southern targets in the 12-17 R magnitude range on high-to mid-resolution spectra obtained with the GIRAFFE and UVES spectrographs.Methods. Comparison of the South Ecliptic Pole (SEP) GIRAFFE data to spectroscopic templates observed with the HERMES (Mercator in La Palma, Spain) spectrograph enabled a first coarse characterisation of the 747 SEP targets. Radial velocities were then obtained by comparing the results of three different methods.Results. In this paper, we present an initial overview of the targets to be found in the 1 sq. deg SEP region that was observed repeatedly by Gaia ever since its commissioning. In our representative sample, we identified one galaxy, six LMC S-stars, nine candidate chromospherically active stars, and confirmed the status of 18 LMC Carbon stars. A careful study of the 3471 epoch radial velocity measurements led us to identify 145 RV constant stars with radial velocities varying by less than 1 km s(-1). Seventy-eight stars show significant RV scatter, while nine stars show a composite spectrum. As expected, the distribution of the RVs exhibits two main peaks that correspond to Galactic and LMC stars. By combining [Fe/H] and log g estimates, and RV determinations, we identified 203 members of the LMC, while 51 more stars are candidate members.Conclusions. This is the first systematic spectroscopic characterisation of faint stars located in the SEP field. During the coming years, we plan to continue our survey and gather additional high-and mid-resolution data to better constrain our knowledge on key reference targets for Gaia.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: kinematics and dynamics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Fremat, Y.
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Altmann, M.
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Pancino, E.
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Soubiran, C.
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Jofre, P.
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Damerdji, Y.
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show more...
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Heiter, Ulrike
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Royer, F.
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Seabroke, G.
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Sordo, R.
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Blanco-Cuaresma, ...
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Jasniewicz, G.
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Martayan, C.
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Thevenin, F.
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Vallenari, A.
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Blomme, R.
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David, M.
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Gosset, E.
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Katz, D.
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Viala, Y.
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Boudreault, S.
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Cantat-Gaudin, T ...
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Lobel, A.
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Meisenheimer, K.
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Nordlander, Thom ...
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Raskin, G.
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Royer, P.
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Zorec, J.
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Uppsala University