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Table 8

System age (tobs) and ISM density (ρISM) 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 tobs (Myr) ρIsm (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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