Radio observations of stellar mass loss

Radio Observations of Algol . II . Computation of Close Stellar Encounters

We present here new astrometric measurements of Algol's position made with Very Long Baseline Interferometry. Using these measurements, along with a new estimate of the node of the inner binary and other orbital elements from the literature, we compute a new proper motion, with uncertainties six times less than those of Hipparcos. We compute the trajectories of Algol (using the new proper motio...

Conference Summary: Mass Loss from Stellar Clusters

Radio observations of stellar winds from early type stars

FifteenO andB supergiants have been observedwith the Very Large Array (VLA) at 4.85, 8.45, and 14.95 GHz in order to make a detailed comparative study of the mass loss rates evaluated from Hα and radio continuum observations and reveal and quantify possible departures from standardwind conditions. We detected 12 sources, 7 of which for the first time, thus increasing by 30% the total number of ...

Mass loss at the lowest stellar masses ⋆

We report the discovery of a jet in a [SII] image of Par-Lup3-4, a remarkable M5-type pre-main sequence object in the Lupus 3 star-forming cloud. The spectrum of this star is dominated by the emission lines commonly interpreted as tracers of accretion and outflows. Par-Lup3-4 is therefore at the very low-mass end of the exciting sources of jets. High resolution spectroscopy shows that the [SII]...

The radio spectrum of a quiescent stellar mass black hole

Observations of V404 Cyg performed with the Westerbork Synthesis Radio Telescope at four frequencies, over the interval 1.4−8.4 GHz, have provided us with the first broadband radio spectrum of a ‘quiescent’ stellar mass black hole. The measured mean flux density is of 0.35 mJy, with a spectral index α = +0.09±0.19 (such that Sν ∝ ν). Synchrotron emission from an inhomogeneous partially self-abs...