Radial velocity measurements of B stars in the Scorpius-Centaurus association

Abstract

We derive single-epoch radial velocities for a sample of 56 B-type stars members of the subgroups Upper Scorpius, Upper Centaurus Lupus and Lower Centaurus Crux of the nearby Sco-Cen OB association. The radial velocity measurements were obtained by means of high-resolution echelle spectra via analysis of individual lines. The internal accuracy obtained in the measurements is estimated to be typically 2-3 km/s, but depends on the projected rotational velocity of the target. Radial velocity measurements taken for 2-3 epochs for the targets HD120307, HD142990 and HD139365 are variable and confirm that they are spectroscopic binaries, as previously identified in the literature. Spectral lines from two stellar components are resolved in the observed spectra of target stars HD133242, HD133955 and HD143018, identifying them as spectroscopic binaries.

arXiv commentaccepted for publication in A&A

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• A Census of the Stellar Populations in the Sco-Cen Complex
• A nearby recent supernova that ejected the runaway star zeta Oph, the pulsar PSRB1706-16, and 60-Fe found on Earth
• Discovery of new magnetic early-B stars within the MiMeS HARPSpol survey
• A brown dwarf desert for intermediate mass stars in Sco OB2?
• delta Cen: a new binary Be star detected by VLTI/AMBER spectro-interferometry
• The auroral radio emission of the magnetic B-type star rho OphC
• VSOP: The Variable Star One-shot Project I. Project presentation and first data release
• Kinematics of the Scorpius-Centaurus OB Association
• Multiples among B stars in the Scorpius-Centaurus association
• BRITE observations of $\nu$ Centauri and $\gamma$ Lupi, the first non-eclipsing members of the new class of nascent binaries
• The evolution of velocity dispersion in the Sco-Cen OB association