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Paper: Multi-Epoch Observations of Dust Formed around WR140
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 139
Authors: Sakon, I.; Ohsawa, R.; Asano, K.; Mori, T. I.; Onaka, T.; Nozawa, T.; Kozasa, T.; Fujiyoshi, T.
Abstract: We present results of the mid-infrared multi-epoch observations of periodically dust-making Wolf-Rayet binary WR140 with Subaru/COMICS. Based on the N- and Q-bands photometric observations, the mass evolution of dust in the expanding concentric arc structures formed during the 2001 and 2009 periastron events is investigated. Our results show that at most 1.0×10–8M of dust survives per periastron later than an orbital phase, suggesting that such WR binary systems may not be the major dust budget in the early universe unless the grain growth later on should not take place.
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