Roche, PF;
Colling, MD;
Barlow, MJ;
(2012)
The outer wind of γ Velorum.
Monthly Notices of the Royal Astronomical Society
, 427
(1)
pp. 581-588.
10.1111/j.1365-2966.2012.22005.x.
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Abstract
Fine-structure mid-infrared emission lines with critical densities in the regime 104 ≤ ncrit ≤ 106 cm−3 can be employed to probe the outflow from Wolf–Rayet (WR) stars at radii of ∼1015 cm. Narrow-band mid-infrared imaging and spectroscopy of the nearest WR star to the Sun, γ Velorum is analysed for spatially resolved forbidden line emission in the WR outer wind. The [S IV] 10.52-μm and [Ne II] 12.81-μm emission regions are found to be spatially extended, compared to unresolved continuum and He and C recombination line emission. The [S IV] and [Ne II] emission line distributions have a high degree of azimuthal symmetry, indicating a spherically symmetric outflow. A model wind with a modest degree of clumping (clumping factor f ∼ 10) provides a better match to the observations than an unclumped model. The overall line intensity distributions are consistent with a freely expanding, spherically symmetric 1/r2 outflow with constant ionization fraction and modestly clumped density structure.
| Type: | Article |
|---|---|
| Title: | The outer wind of γ Velorum |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1111/j.1365-2966.2012.22005.x |
| Publisher version: | https://doi.org/10.1111/j.1365-2966.2012.22005.x |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | circumstellar matter, stars: abundances, stars: individual: γ Velorum, stars: winds, outflows, stars: Wolf–Rayet, infrared: stars |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10095266 |
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