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      HD 35502: a hierarchical triple system with a magnetic B5IVpe primary

      , , , , , , , , , the MiMeS and BinaMIcS Collaborations
      Monthly Notices of the Royal Astronomical Society
      Oxford University Press (OUP)

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          The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance

          The all sky surveys done by the Palomar Observatory Schmidt, the European Southern Observatory Schmidt, and the United Kingdom Schmidt, the InfraRed Astronomical Satellite and the 2 Micron All Sky Survey have proven to be extremely useful tools for astronomy with value that lasts for decades. The Wide-field Infrared Survey Explorer is mapping the whole sky following its launch on 14 December 2009. WISE began surveying the sky on 14 Jan 2010 and completed its first full coverage of the sky on July 17. The survey will continue to cover the sky a second time until the cryogen is exhausted (anticipated in November 2010). WISE is achieving 5 sigma point source sensitivities better than 0.08, 0.11, 1 and 6 mJy in unconfused regions on the ecliptic in bands centered at wavelengths of 3.4, 4.6, 12 and 22 microns. Sensitivity improves toward the ecliptic poles due to denser coverage and lower zodiacal background. The angular resolution is 6.1, 6.4, 6.5 and 12.0 arc-seconds at 3.4, 4.6, 12 and 22 microns, and the astrometric precision for high SNR sources is better than 0.15 arc-seconds.
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            Validation of the new Hipparcos reduction

            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 catalogue. 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 process, 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 correlation 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.
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              Practical Statistics for Astronomers

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                Author and article information

                Journal
                Monthly Notices of the Royal Astronomical Society
                Mon. Not. R. Astron. Soc.
                Oxford University Press (OUP)
                0035-8711
                1365-2966
                June 07 2016
                August 01 2016
                August 01 2016
                August 01 2016
                August 01 2016
                May 06 2016
                : 460
                : 2
                : 1811-1828
                Article
                10.1093/mnras/stw1077
                fb095781-5eb8-41e5-9c89-6d04c6dc7800
                © 2016
                History

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