Triggered star formation at the borders of the H ii region Sh 2-217

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Table 8

Cluster parameters.

Number of members with K < 16.5	~141
Fraction of members with H − K > 1	20 %
Radius	1.3 pc
Expected number of members^a down to 0.1 M_⊙	254 (605)
Expected number of members^a with M > 10 M_⊙	1 (3)
Total stellar mass^a	183 (435) M_⊙
Star-formation efficiency^b	14% (28%)

Notes.

^(a)

Assuming all the stars down to 0.3(0.8) M_⊙ have been detected.

^(b)

Defined as M_∗/(M_∗ + M_gas); M_gas = 1100 M_⊙ (Table 4).

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