Fundamental parameters and infrared excesses of Tycho–Gaia stars

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    Effective temperatures and luminosities are calculated for 1 475 921 Tycho-2 and 107 145 Hipparcos stars, based on distances from Gaia Data Release 1. Parameters are derived by comparing multi-wavelength archival photometry to bt-settl model atmospheres. The 1σ uncertainties for the Tycho-2 and Hipparcos stars are ±137 K and ±125 K in temperature and ±35 per cent and ±19 per cent in luminosity. The luminosity uncertainty is dominated by that of the Gaia parallax. Evidence for infrared
    excess between 4.6 and 25 μm is found for 4256 stars, of which 1883 are strong candi- dates. These include asymptotic giant branch (AGB) stars, Cepheids, Herbig Ae/Be stars, young stellar objects, and other sources. We briefly demonstrate the
    capabilities of this dataset by exploring local interstellar extinction, the onset of dust production in AGB stars, the age and metallicity gradients of the solar neighbourhood and structure within the Gould Belt. We close by discussing the potential impact of future Gaia data releases.
    Original languageEnglish
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number1
    Early online date15 Jun 2017
    Publication statusPublished - 11 Oct 2017


    • circumstellar matter
    • stars: fundamental parameters
    • Hertzsprung- Russell and colour-magnitude diagrams
    • stars: mass-loss
    • solar neighbourhood
    • Infrared: stars


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