Expanding shells around young clusters – S 171/Be 59

Open Access

Table 8

System age (t_obs) and ISM density (ρ_ISM) estimates by solving the Weaver and Lancaster models for the observed radii and velocities of the shell (25 pc and 4 km s⁻¹, respectively) and cloudlets (31 pc and 12 km s⁻¹, respectively).

Model	t_obs (Myr)	ρ_Ism (amu cm⁻³)
Weaver Shell	3.67	1.23 × 10³

Lancaster Shell	3.06	6.74

Weaver Cloudlets	1.52	2.96 × 10¹

Lancaster Cloudlets	1.26	4.87 × 10⁻¹

Notes. These values were computed assuming η = 1; different values for η do not modify the age but do modify the density linearly.

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