Spectroscopic and photometric oscillatory envelope variability during the S Doradus outburst of the luminous blue variable R71

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Table 4

Surface chemical abundances for R71. Error estimates are on a 10–20% level. For He the error may be as large as 50%.

Species	Number fraction	Mass fraction^a	Z / Z _LMC
	(relative to H)

H	1.0	5.5e-01	0.745
He	0.2	4.4e-01	1.719
C	3.0e-05	2.0e-04	0.204
N	6.0e-04	4.6e-03	16.292
O	5.0e-05	4.4e-04	0.180

Notes. Derived from the 1984–2005 pre-outburst spectra.

^(a)

LMC mass fraction: H = 7.38e-01, He = 2.56e-01, C = 9.79e-04, N = 2.82e-04, O = 2.45e-03.

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