The Cocoon nebula and its ionizing star: do stellar and nebular abundances agree?

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Table 5

Comparison of derived stellar and gas-phase nebular abundances obtained for the Cocoon nebula, M 43, and the Orion nebula.

	Cocoon^a		Orion		M 43	Solar neighborhood

	Nebular (CEL)	B stars	Nebular (CEL)^b	B stars	Nebular (CEL)^f	B stars^g

Si	−	7.51±0.05	−	7.51^c/7.50^d±0.05	−	7.50±0.05
O	8.52±0.05	8.73±0.08	8.54±0.03	8.73^c/8.77^d±0.04	8.53±0.09	8.76±0.05
N	7.81±0.03	7.86±0.05	7.73±0.09	7.82^d±0.07	7.82±0.04	7.79±0.04
S	6.81±0.04	−	6.83±0.04	7.15^e±0.05	6.95±0.09	−

Notes. All the CEL abundances are for t² = 0. Abundances from other B-type stars in the Solar neighborhood are also quoted for reference. ;

^(a)

This work

^(b)

Reanalysis of the Orion nebula spectrum by Esteban et al. (2004) using the same atomic dataset as in this work (see Table 2);

^(c)

Simón-Díaz (2010), similar analysis as in this work using FASTWIND;

^(d)

Nieva & Simón-Díaz (2011), reanalysis of the spectra from Simón-Díaz (2010) using similar techniques as in Nieva & Przybilla (2012);

^(e)

Daflon et al. (2009);

^(f)

Reanalysis of M 43 spectrum by Simón-Díaz et al. (2011b) using the same atomic dataset as in this work;

^(g)

Nieva & Przybilla (2012).

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