... 51 Ophiuchi

Based on ESO/VLTI programs 077.C-0706 and 60.A-9054.

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... narrow

The width of the ring is fixed at the typical value of $\Delta{R}/R=20\%$, the results being poorly dependent on its value as long as $\Delta{R} \ll R$.

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... particles

${\rm d}n(a) \propto a^{-3.7} ~{\rm d}a$, ranging from $a_{\rm min} = 0.03~\mu$m to $a_{\rm max} = 1~$mm, with optical constants from Mathis & Whiffen (1989).

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