Spectral analysis of four surprisingly similar hot hydrogen-rich subdwarf O stars

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Table 2

Fundamental parameters derived from optical spectroscopy.

Star	Spectrum	T_eff (K)	log g	log N(He)/N(H)


Feige 34	MMT 1.0 Å	62 400 ± 330	5.949 ± 0.015	−1.754 ± 0.015
	BOK 1.3 Å	62 317 ± 300	6.032 ± 0.012	−1.8^a
	ISIS 2.0 Å	61 974 ± 304	5.980 ± 0.013	−1.765 ± 0.021
	BOK 8.7 Å	63 510 ± 820	5.984 ± 0.035	−1.842 ± 0.039
Feige 67	BOK 1.3 Å	61 114 ± 318	5.920 ± 0.014	−1.6^a
	BOK 8.7 Å	61 000 ± 723	5.981 ± 0.041	−1.594 ± 0.038
AGK+81°266	BOK 1.3 Å	62 590 ± 538	6.067 ± 0.021	−2.9^a
	CAFOS 5.5 Å	60 859 ± 1182	6.093 ± 0.063	−2.986 ± 0.200
	BOK 8.7 Å	62 136 ± 900	6.060 ± 0.044	−2.882 ± 0.140
LS II+18°9	BOK 1.3 Å	61 390 ± 350	5.992 ± 0.015	−1.9^a
	CAFOS 5.5 Å	57 767 ± 1067	5.996 ± 0.058	−1.851 ± 0.071
	BOK 8.7 Å	60 884 ± 996	6.024 ± 0.056	−1.890 ± 0.056

Notes.

^(a)

Because of the absence of visible He lines in the Bok 1.3 Å spectral range, the abundance was kept fixed.

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