Dust formation by the colliding-wind WC5+O9 binary WR19 at periastron passage

Details Dust formation by the colliding-wind WC5+O9 binary WR19 at periastron passage Dust formation by the colliding-wind WC5+O9 binary WR19 at periastron passage

2009-02-24

arxiv.org/abs/0902.4105v1

MNRAS 395, 2221, 2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages and 4 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2009.14681.x

We present infrared photometry of the episodic dust-making Wolf-Rayet system WR19 (LS3), tracking its fading from a third observed dust-formation episode in 2007 and strengthening the view that these episodes are periodic (P = 10.1+/-0.1 y). Radial velocities of the O9 component observed between 2001 and 2008 show RV variations consistent with WC19 being a spectroscopic binary of high eccentricity (e=0.8), having periastron passage in 2007.14, shortly before the phase of dust formation. In this respect, WR19 resembles the archetypical episodic dust-making colliding-wind binary system WR140.

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