Mon. Not. R. Astron. Soc., 485, 1508-1527 (2019/May-2)
The magnetic early B-type Stars II: stellar atmospheric parameters in the era of Gaia.
SHULTZ M.E., WADE G.A., RIVINIUS T., ALECIAN E., NEINER C., PETIT V., WISNIEWSKI J.P. (The MiMeS and BinaMIcS Collaborations)
Abstract (from CDS):
Atmospheric parameters determined via spectral modelling are unavailable for many of the known magnetic early B-type stars. We utilized high-resolution spectra together with non-local thermodynamic equilibrium models to measure effective temperatures Teff and surface gravities log g of stars for which these measurements are not yet available. We find good agreement between our Teff measurements and previous results obtained both photometrically and spectroscopically. For log g, our results are compatible with previous spectroscopic measurements; however, surface gravities of stars previously determined photometrically have been substantially revised. We furthermore find that log g measurements obtained with HARPSpol are typically about 0.1 dex lower than those from comparable instruments. Luminosities were determined using Gaia Data Release 2 parallaxes. We find Gaia parallaxes to be unreliable for bright stars (V < 6 mag) and for binaries; in these cases we reverted to Hipparcos parallaxes. In general, we find luminosities systematically lower than those previously reported. Comparison of log g and log L to available rotational and magnetic measurements shows no correlation between either parameter with magnetic data, but a clear slow-down in rotation with both decreasing log g and increasing log L, a result compatible with the expectation that magnetic braking should lead to rapid magnetic spin-down that accelerates with increasing mass-loss.
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
magnetic fields - stars: chemically peculiar - stars: early-type - stars: massive - stars: rotation
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