SIMBAD references

2004A&A...416..171B - Astronomy and Astrophysics, volume 416, 171-178 (2004/3-2)

Radio observations of HD93129A: The earliest O star with the highest mass loss?


Abstract (from CDS):

We present the results of radio continuum observations towards the open cluster Tr14, where our main targets are the early-type O stars HD93129A/B and HD93128. The observations were carried out at 3cm (8.64GHz) and 6cm (4.80GHz) with the Australia Telescope Compact Array. Only HD93129A (type O2 If*) was detected; we measure flux densities of S3cm=2.0±0.2mJy and S6cm=4.1±0.4mJy. The resulting spectral index of α=-1.2±0.3 (Sν∝να) indicates predominantly non-thermal emission, suggesting HD93129A may be a binary system. We propose that the observed 3cm radio emission is mostly coming from the non-thermal wind collision region of a binary, and, to a lesser extent, from the thermal winds of the primary and secondary stars in HD93129A. At a stellar distance of 2.8kpc, we derive a mass-loss rate {dot}(M)=5.1x10–5M/yr, assuming the thermal fraction of the 3cm emission is ∼0.5.

Abstract Copyright:

Journal keyword(s): stars: individual: HD93129A, HD93129B, HD93128 - stars: mass-loss - stars: winds, outflows - radio continuum: stars

Simbad objects: 19

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