Modelling of dust around the symbiotic Mira RR Telescopii during obscuration epochs

Home

All issues

Volume 544 (August 2012)

A&A, 544 (2012) A35

Full HTML

Free Access

Table 11

Dust shell properties determined by modelling JHKL colour indices with the DUSTY numerical code.

Colour	T_dust (K)		a_max (μm)		r₁/r_c		τ_V	A_K	Ṁ	v_e
indices	Average	Limits	Average	Limits	Average	Limits			(10^-6M_⊙/yr)	(km s^-1)

J − H/H − K	1350	1200–1500	1.5	0.7–6.0^a	3.2	2.2–4.2	1.3–6.5	0.14–0.72	1.6–6.9	27–39
J − H/H − L	1250	1000–1350	4.0	1.0–6.0^a	3.4	2.4–4.3	1.8–6.3	0.20–0.69	2.2–9.7	23–33
J − K/K − L	1150	1000–1200	5.0	2.0–6.0^a	4.3	3.0–5.5	1.8–6.0	0.20–0.66	3.0–10.6	19–25

Average	1250 ± 200^b		3.5_-2.5^a,^b		3.6 ± 1.5^b		1.6–6.3	0.18–0.69	2.3–9.0	23–32

Notes. T_dust – dust temperature on the inner boundary of the dust shell (sublimation temperature); a_max – maximum dust grain diameter; r₁/r_c – radius of the shell inner boundary (sublimation radius) r₁ expressed in units of the stellar radius r_c; τ_V – optical depth; A_K – extinction at K; Ṁ – mass loss rate assuming radiatively driven winds; v_e – terminal escape velocity of the stellar wind.

^(a)

Upper value of the maximum grain size cannot be determined from the near-IR colours because the model is insensitive to an increase of the grain size above ~6 μm.

^(b)

Errors for dust sublimation temperature, dust sublimation radius, and maximum grain size are only estimates.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.