Condensation of a shell around HD 193793
Open Access
- 1 December 1978
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 185 (3) , 467-472
- https://doi.org/10.1093/mnras/185.3.467
Abstract
Infrared photometry of the Wolf–Rayet binary HD 193793 shows that grains condensed in its circumstellar shell between 1976 June and 1977 August. The observations can be fitted by an optically thin shell of 4 × 10−8M⊙ of graphite grains at a temperature of about 900 K. A spectrum in the 2-μm atmospheric window reveals an emission feature near 2.04 μm. We have found the same feature in the W–R system γ2 Vel and provisionally ascribe it to the 2.058-μm He I line.Keywords
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