The VLT-FLAMES Tarantula Survey - XXVIII. Nitrogen abundances for apparently single dwarf and giant B-type stars with small projected rotational velocities

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Table 3

Estimates of the initial rotational velocity, v_i, required to achieve nitrogen enhancements of greater than 0.3 dex (ϵ_N ≥ 7.2 dex) and 0.6 dex (ϵ_N ≥ 7.5 dex) whilst maintaining a gravity, log g ≥ 3.3 dex.

M_i / M_⊙	ϵ_N ≥ 7.2 dex		ϵ_N ≥ 7.5 dex
	v_i	v_e	v_i	v_e
	km s⁻¹	km s⁻¹	km s⁻¹	km s⁻¹
5	180	142	258	219
8	161	132	230	207
12	163	140	219	200
16	144	130	217	203
Adopted	145	135	220	205

Notes. Also listed are the minimum rotational velocities, v_e, predicted by the models during this evolutionary phase. Initial masses (M_i) are in units of the solar mass, M_⊙. The values characterised as “Adopted” were used in the simulations discussed in Sects. 6.3–6.5.

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