Validation of the new Hipparcos reduction
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TLDR
In this article, a new reduction of the Hipparcos data was published, which claimed accuracies for nearly all stars brighter than magnitude Hp = 8 to be better, by up to a factor 4, than in the original catalog.Abstract:
Context. A new reduction of the astrometric data as produced by the Hipparcos mission has been published, claiming accuracies for nearly all stars brighter than magnitude Hp = 8 to be better, by up to a factor 4, than in the original catalog ue. Aims. The new Hipparcos astrometric catalogue is checked for the quality of the data and the consistency of the formal errors as well as the possible presence of error correlations. The differences with the earlier publication are explained. Methods. The internal errors are followed through the reduction proc ess, and the external errors are investigated on the basis of a comparison with radio observations of a small selection of stars, and the distribution of negative parallaxes. Error co rrelation levels are investigated and the reduction by more than a factor 10 as obtained in the new catalogue is explained. Results. The formal errors on the parallaxes for the new catalogue are confirmed. The presence of a small amount of additional noise , though unlikely, cannot be ruled out. Conclusions. The new reduction of the Hipparcos astrometric data provides an improvement by a factor 2.2 in the total weight compared to the catalogue published in 1997, and provides much improved data for a wide range of studies on stellar luminosities and local galactic kinematics.read more
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Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
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TL;DR: In this article, the intrinsic colors and temperatures of 5-30 Myr old pre-main sequence (pre-MS) stars were analyzed using optical spectra taken with the SMARTS 1.5m telescope.
Journal ArticleDOI
Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
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Journal ArticleDOI
A terrestrial planet candidate in a temperate orbit around Proxima Centauri
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TL;DR: Observations reveal the presence of a small planet with a minimum mass of about 1.3 Earth masses orbiting Proxima with a period of approximately 11.2 days at a semi-major-axis distance of around 0.05 astronomical units.
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Book
Hipparcos, the New Reduction of the Raw Data
TL;DR: The Hipparcos mission as discussed by the authors was the first attempt to estimate the position and velocities of a single star from its photometric pass bands, which were then used to calculate the position of the satellite.
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Allende Prieto,António Amorim,Guillem Anglada-Escudé,V. Arsenijevic,S. Azaz,P. Balm,M. Beck,H.-H. Bernstein,Lionel Bigot,Albert Bijaoui,C. Blasco,M. Bonfigli,Giuseppe Bono,Steve Boudreault,Alessandro Bressan,S. Brown,P.-M. Brunet,P. S. Bunclark,R. Buonanno,A. G. Butkevich,C. Carret,C. Carrion,Laurent Chemin,F. Chéreau,Leonardo Corcione,E. Darmigny,K. S. de Boer,P. de Teodoro,P. T. de Zeeuw,C. Delle Luche,Catherine Dominguès,Pierre Dubath,F. Fodor,B. Frézouls,A. Fries,Diego Fustes,D. Fyfe,E. Gallardo,J. Gallegos,Daniele Gardiol,M. Gebran,A. Gomboc,A. E. Gomez,E. Grux,A. Gueguen,A. Heyrovsky,J. Hoar,G. Iannicola,Y. Isasi Parache,A.-M. Janotto,E. Joliet,A. Jonckheere,R. Keil,Dae-Won Kim,Peter Klagyivik,Joakim Klar,J. Knude,Oleg Kochukhov,I. Kolka,Janez Kos,A. Kutka,Valéry Lainey,D. LeBouquin,Chao Liu,Davide Loreggia,Valeri V. Makarov,M. Marseille,Christophe Martayan,O. Martinez-Rubi,B. Massart,F. Meynadier,Shan Mignot,Ulisse Munari,A.-T. Nguyen,Thomas Nordlander,P. Ocvirk,K. S. O'Flaherty,A. Olias Sanz,P. Ortiz,J. Osorio,Dagmara Oszkiewicz,A. Ouzounis,M. Palmer,P. Park,Ester Pasquato,C. Peltzer,J. Peralta,F. Péturaud,T. Pieniluoma,E. Pigozzi,J. Poels,G. Prat,Thibaut Prod'homme,F. Raison,José Manuel Rebordão,D. Risquez,Brigitte Rocca-Volmerange,Simon Rosen,M. I. Ruiz-Fuertes,Federico Russo,Steven Sembay,I. Serraller Vizcaino,A. Short,A. Siebert,H. Silva,D. Sinachopoulos,Eric Slezak,Michael Soffel,Danuta Sosnowska,V. Straižys,M. ter Linden,Dirk Terrell,Stephan Theil,C. Tiede,L. Troisi,P. Tsalmantza,D. Tur,Mattia Vaccari,Frédéric Vachier,P. Valles,W. Van Hamme,L. Veltz,Jenni Virtanen,J.-M. Wallut,R. Wichmann,Mark I. Wilkinson,H. Ziaeepour,Sven Zschocke +624 more