Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-29
Astron.Astrophys. 416 (2004) 171-178
Astronomy and Astrophysics
Astrophysics
9 pages, 3 figures, accepted in A&A
Scientific paper
10.1051/0004-6361:20034138
We present the results of radio continuum observations towards the open cluster Tr 14, where our main targets are the early-type O stars HD 93129A/B and HD 93128. The observations were carried out at 3 cm (8.64 GHz) and 6 cm (4.80 GHz) with the Australia Telescope Compact Array. Only HD 93129A (type O2 If*) was detected; we measure flux densities of S_(3cm) = 2.0 +- 0.2 mJy and S_(6cm) = 4.1 +- 0.4 mJy. The resulting spectral index of alpha = -1.2 +- 0.3 (S_(nu) = k . nu^alpha) indicates predominantly non-thermal emission, suggesting HD 93129A may be a binary system. We propose that the observed 3 cm 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 HD 93129A. At a stellar distance of 2.8 kpc, we derive a mass-loss rate M_dot = 5.1 x 10^(-5) M_sun/yr, assuming the thermal fraction of the 3 cm emission is about 0.5.
Benaglia Paula
Koribalski Baerbel
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