000003402 001__ 3402
000003402 005__ 20180116111755.0
000003402 0247_ $$2DOI$$a10.1051/0004-6361/201629925
000003402 037__ $$aSCART-2018-0016
000003402 100__ $$aGaia, Collaboration
000003402 245__ $$aGaia Data Release 1. Testing parallaxes with local Cepheids and RR Lyrae stars
000003402 260__ $$c2017
000003402 520__ $$aContext. Parallaxes for 331 classical Cepheids, 31 Type II Cepheids, and 364 RR Lyrae stars in common between Gaia and the Hipparcos and Tycho-2 catalogues are published in Gaia Data Release 1 (DR1) as part of the Tycho-Gaia Astrometric Solution (TGAS). Aims: In order to test these first parallax measurements of the primary standard candles of the cosmological distance ladder, which involve astrometry collected by Gaia during the initial 14 months of science operation, we compared them with literature estimates and derived new period-luminosity (PL), period-Wesenheit (PW) relations for classical and Type II Cepheids and infrared PL, PL-metallicity (PLZ), and optical luminosity-metallicity (MV-[Fe/H]) relations for the RR Lyrae stars, with zero points based on TGAS. Methods: Classical Cepheids were carefully selected in order to discard known or suspected binary systems. The final sample comprises 102 fundamental mode pulsators with periods ranging from 1.68 to 51.66 days (of which 33 with σϖ/ϖ< 0.5). The Type II Cepheids include a total of 26 W Virginis and BL Herculis stars spanning the period range from 1.16 to 30.00 days (of which only 7 with σϖ/ϖ< 0.5). The RR Lyrae stars include 200 sources with pulsation period ranging from 0.27 to 0.80 days (of which 112 with σϖ/ϖ< 0.5). The new relations were computed using multi-band (V,I,J,Ks) photometry and spectroscopic metal abundances available in the literature, and by applying three alternative approaches: (I) linear least-squares fitting of the absolute magnitudes inferred from direct transformation of the TGAS parallaxes; (II) adopting astrometry-based luminosities; and (III) using a Bayesian fitting approach. The last two methods work in parallax space where parallaxes are used directly, thus maintaining symmetrical errors and allowing negative parallaxes to be used. The TGAS-based PL,PW,PLZ, and MV- [Fe/H] relations are discussed by comparing the distance to the Large Magellanic Cloud provided by different types of pulsating stars and alternative fitting methods. Results: Good agreement is found from direct comparison of the parallaxes of RR Lyrae stars for which both TGAS and HST measurements are available. Similarly, very good agreement is found between the TGAS values and the parallaxes inferred from the absolute magnitudes of Cepheids and RR Lyrae stars analysed with the Baade-Wesselink method. TGAS values also compare favourably with the parallaxes inferred by theoretical model fitting of the multi-band light curves for two of the three classical Cepheids and one RR Lyrae star, which were analysed with this technique in our samples. The K-band PL relations show the significant improvement of the TGAS parallaxes for Cepheids and RR Lyrae stars with respect to the Hipparcos measurements. This is particularly true for the RR Lyrae stars for which improvement in quality and statistics is impressive. Conclusions: TGAS parallaxes bring a significant added value to the previous Hipparcos estimates. The relations presented in this paper represent the first Gaia-calibrated relations and form a work-in-progress milestone report in the wait for Gaia-only parallaxes of which a first solution will become available with Gaia Data Release 2 (DR2) in 2018.
000003402 594__ $$aNO
000003402 6531_ $$aastrometry
000003402 6531_ $$aparallaxes
000003402 6531_ $$astars: distances
000003402 6531_ $$astars: variables: Cepheids
000003402 6531_ $$astars: variables: RR Lyrae
000003402 6531_ $$amethods: data analysis
000003402 700__ $$aClementini, G.
000003402 700__ $$aEyer, L.
000003402 700__ $$aRipepi, V.
000003402 700__ $$aMarconi, M.
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000003402 700__ $$aGarofalo, A.
000003402 700__ $$aSarro, L. M.
000003402 700__ $$aPalmer, M.
000003402 700__ $$aLuri, X.
000003402 700__ $$aMolinaro, R.
000003402 700__ $$aRimoldini, L.
000003402 700__ $$aSzabados, L.
000003402 700__ $$aMusella, I.
000003402 700__ $$aAnderson, R. I.
000003402 700__ $$aPrusti, T.
000003402 700__ $$ade Bruijne, J. H. J.
000003402 700__ $$aBrown, A. G. A.
000003402 700__ $$aVallenari, A.
000003402 700__ $$aBabusiaux, C.
000003402 700__ $$aBailer-Jones, C. A. L.
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000003402 700__ $$aBiermann, M.
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000003402 700__ $$aRandich, S.
000003402 700__ $$aSartoretti, P.
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000003402 700__ $$aCocozza, G.
000003402 700__ $$aCollins, R. S.
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000003402 700__ $$aCross, N. J. G.
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000003402 700__ $$aCrowley, C.
000003402 700__ $$aDafonte, C.
000003402 700__ $$aDamerdji, Y.
000003402 700__ $$aDapergolas, A.
000003402 700__ $$aDavid, P.
000003402 700__ $$aDavid, M.
000003402 700__ $$aDe Cat, P.
000003402 700__ $$ade Felice, F.
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000003402 700__ $$aDe Luise, F.
000003402 700__ $$aDe March, R.
000003402 700__ $$ade Souza, R.
000003402 700__ $$aDebosscher, J.
000003402 700__ $$adel Pozo, E.
000003402 700__ $$aDelbo, M.
000003402 700__ $$aDelgado, A.
000003402 700__ $$aDelgado, H. E.
000003402 700__ $$aDi Matteo, P.
000003402 700__ $$aDiakite, S.
000003402 700__ $$aDistefano, E.
000003402 700__ $$aDolding, C.
000003402 700__ $$aDos Anjos, S.
000003402 700__ $$aDrazinos, P.
000003402 700__ $$aDurán, J.
000003402 700__ $$aDzigan, Y.
000003402 700__ $$aEdvardsson, B.
000003402 700__ $$aEnke, H.
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000003402 700__ $$aEynard Bontemps, G.
000003402 700__ $$aFabre, C.
000003402 700__ $$aFabrizio, M.
000003402 700__ $$aFalcão, A. J.
000003402 700__ $$aFarràs Casas, M.
000003402 700__ $$aFederici, L.
000003402 700__ $$aFedorets, G.
000003402 700__ $$aFernández-Hernández, J.
000003402 700__ $$aFernique, P.
000003402 700__ $$aFienga, A.
000003402 700__ $$aFigueras, F.
000003402 700__ $$aFilippi, F.
000003402 700__ $$aFindeisen, K.
000003402 700__ $$aFonti, A.
000003402 700__ $$aFouesneau, M.
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000003402 700__ $$aFraser, M.
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000003402 700__ $$aGai, M.
000003402 700__ $$aGalleti, S.
000003402 700__ $$aGalluccio, L.
000003402 700__ $$aGarabato, D.
000003402 700__ $$aGarcía-Sedano, F.
000003402 700__ $$aGarralda, N.
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000003402 700__ $$aGerssen, J.
000003402 700__ $$aGeyer, R.
000003402 700__ $$aGilmore, G.
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000003402 700__ $$aGiuffrida, G.
000003402 700__ $$aGomes, M.
000003402 700__ $$aGonzález-Marcos, A.
000003402 700__ $$aGonzález-Núñez, J.
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000003402 700__ $$aGranvik, M.
000003402 700__ $$aGuerrier, A.
000003402 700__ $$aGuillout, P.
000003402 700__ $$aGuiraud, J.
000003402 700__ $$aGúrpide, A.
000003402 700__ $$aGutiérrez-Sánchez, R.
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000003402 700__ $$aBeck, M.
000003402 700__ $$aBernstein, H.-H.
000003402 700__ $$aBigot, L.
000003402 700__ $$aBijaoui, A.
000003402 700__ $$aBlasco, C.
000003402 700__ $$aBonfigli, M.
000003402 700__ $$aBono, G.
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000003402 700__ $$aBressan, A.
000003402 700__ $$aBrown, S.
000003402 700__ $$aBrunet, P.-M.
000003402 700__ $$aBunclark†, P.
000003402 700__ $$aBuonanno, R.
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000003402 700__ $$aCarrion, C.
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000003402 700__ $$aChéreau, F.
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000003402 700__ $$ade Teodoro, P.
000003402 700__ $$ade Zeeuw, P. T.
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000003402 700__ $$aFodor, F.
000003402 700__ $$aFrézouls, B.
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000003402 700__ $$aGardiol, D.
000003402 700__ $$aGebran, M.
000003402 700__ $$aGomboc, A.
000003402 700__ $$aGómez, A.
000003402 700__ $$aGrux, E.
000003402 700__ $$aGueguen, A.
000003402 700__ $$aHeyrovsky, A.
000003402 700__ $$aHoar, J.
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000003402 700__ $$aIsasi Parache, Y.
000003402 700__ $$aJanotto, A.-M.
000003402 700__ $$aJoliet, E.
000003402 700__ $$aJonckheere, A.
000003402 700__ $$aKeil, R.
000003402 700__ $$aKim, D.-W.
000003402 700__ $$aKlagyivik, P.
000003402 700__ $$aKlar, J.
000003402 700__ $$aKnude, J.
000003402 700__ $$aKochukhov, O.
000003402 700__ $$aKolka, I.
000003402 700__ $$aKos, J.
000003402 700__ $$aKutka, A.
000003402 700__ $$aLainey, V.
000003402 700__ $$aLeBouquin, D.
000003402 700__ $$aLiu, C.
000003402 700__ $$aLoreggia, D.
000003402 700__ $$aMakarov, V. V.
000003402 700__ $$aMarseille, M. G.
000003402 700__ $$aMartayan, C.
000003402 700__ $$aMartinez-Rubi, O.
000003402 700__ $$aMassart, B.
000003402 700__ $$aMeynadier, F.
000003402 700__ $$aMignot, S.
000003402 700__ $$aMunari, U.
000003402 700__ $$aNguyen, A.-T.
000003402 700__ $$aNordlander, T.
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000003402 700__ $$aOsorio, J.
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000003402 700__ $$aPasquato, E.
000003402 700__ $$aPeltzer, C.
000003402 700__ $$aPeralta, J.
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000003402 700__ $$aPoels†, J.
000003402 700__ $$aPrat, G.
000003402 700__ $$aProd'homme, T.
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000003402 700__ $$aRisquez, D.
000003402 700__ $$aRocca-Volmerange, B.
000003402 700__ $$aRosen, S.
000003402 700__ $$aRuiz-Fuertes, M. I.
000003402 700__ $$aRusso, F.
000003402 700__ $$aSerraller Vizcaino, I.
000003402 700__ $$aShort, A.
000003402 700__ $$aSiebert, A.
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000003402 700__ $$aSosnowska, D.
000003402 700__ $$aStraižys, V.
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000003402 700__ $$aValles, P.
000003402 700__ $$aVan Hamme, W.
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000003402 700__ $$aWilkinson, M. I.
000003402 700__ $$aZiaeepour, H.
000003402 700__ $$aZschocke, S.
000003402 773__ $$c1-29$$nA79$$pAstronomy & Astrophysics$$v605$$y2017
000003402 8560_ $$fpeter@observatoire.be
000003402 85642 $$ahttps://www.aanda.org/articles/aa/abs/2017/09/aa29925-16/aa29925-16.html
000003402 85642 $$ahttps://www.aanda.org/articles/aa/pdf/2017/09/aa29925-16.pdf
000003402 85642 $$ahttps://arxiv.org/abs/1705.00688
000003402 905__ $$apublished in
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