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2006MNRAS.370..884T - Mon. Not. R. Astron. Soc., 370, 884-890 (2006/August-1)
Orbital elements, masses and distance of λ Scorpii A and B determined with the Sydney University Stellar Interferometer and high-resolution spectroscopy.
TANGO W.J., DAVIS J., IRELAND M.J., AERTS C., UYTTERHOEVEN K., JACOB A.P., MENDEZ A., NORTH J.R., SENETA E.B. and TUTHILL P.G.
Abstract (from CDS):
The brightness ratio between the two B stars was also measured at λ = 442 and 700nm. The brightness ratio and colour index are consistent with the previous classification of λ Sco A as B1.5 and λ Sco B as B2. Evolutionary models show that the two stars lie on the main sequence. Since they have the same age and luminosity class (IV), the mass-luminosity relation can be used to determine the mass ratio of the two stars: MB/MA = 0.76±0.04.
The spectroscopic data have been reanalyzed using the interferometric values for P, T, e and ω, leading to revised values for a1 sin i and the mass function. The individual masses can be found from the mass ratio, the mass function, spectrum synthesis and the requirement that the age of both components must be the same: MA = 10.4±1.3 and MB = 8.1±1.0 M☉.
The masses, angular semimajor axis and the period of the system can be used to determine the dynamical parallax. We find the distance to λSco to be 112±5pc, which is approximately a factor of 2 closer than the Hipparcos value of 216±42pc.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): techniques: interferometric - binaries: spectroscopic - binaries: visual - stars: fundamental parameters
Simbad objects: 5
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