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26 April 2024 |
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Massive Binary WR112 and Properties of Wolf-Rayet Dust | | S.V. Marchenko
; A.F.J. Moffat
; W.D. Vacca
; S. Cote
; R. Doyon
; | | Date: |
17 Dec 2001 | | Subject: | astro-ph | | Affiliation: | Universite de Montreal), A.F.J. Moffat (Universite de Montreal), W.D. Vacca (Max-Plank-Institut fuer extraterrestrische Physik), S. Cote (Canadian Gemini Office, Herzberg Institute of Astrophysics) and R. Doyon (Universite de Montreal | | Abstract: | Some hot, massive, population-I Wolf-Rayet (WR) stars of the carbon subclass are known to be prolific dust-producers. How dust can form in such a hostile environment remains a mystery. Here we report the discovery of a relatively cool, extended, multi-arc dust envelope around the star WR112, most likely formed by wind-wind collision in a long-period binary system. We derive the binary orbital parameters, the dust temperature and the dust mass distributions in the envelope. We find that amorphous carbon is a main constituent of the dust, in agreement with earlier estimates and theoretical predictions. However, the characteristic size of the dust grains is estimated to be ~1 micron, significantly larger than theoretical limits. The dust production rate is 6.1*10^[-7] M_Sun / yr and the total detectable dust mass is found to be about 2.8*10^[-5] M_Sun (for d=4.15 kpc). We also show that, despite the hostile environment, at least ~20% of the initially-formed dust may reach the interstellar medium. | | Source: | arXiv, astro-ph/0112403 | | Services: | Forum | Review | PDF | Favorites | |
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