Journal Article

Dust formation by the colliding wind WC5+O9 binary WR 19 at periastron passage*

P. M. Williams, G. Rauw and K. A. Van Der Hucht

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 4, pages 2221-2225
Published in print June 2009 | ISSN: 0035-8711
Published online May 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14681.x
Dust formation by the colliding wind WC5+O9 binary WR 19 at periastron passage*

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We present infrared photometry of the episodic dust-making Wolf–Rayet system WR 19 (LS 3), tracking its fading from a third observed dust formation episode in 2007 and strengthening the view that these episodes are periodic (P= 10.1 ± 0.1y). Radial velocities (RVs) of the O9 component observed between 2001 and 2008 show RV variations consistent with WR 19 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, WR 19 resembles the archetypical episodic dust-making colliding wind binary system WR 140.

Keywords: binaries: spectroscopic; circumstellar matter; stars: individual: WR 19; stars: Wolf–Rayet; infrared: stars

Journal Article.  3560 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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