Carbon-rich (DQ) white dwarfs in the Sloan Digital Sky Survey

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Table 3

Comparison of average surface gravities for different types of helium-rich, cool white dwarfs.

DQ			DZ				DB/DC
T_eff	⟨log g⟩	slg	N	⟨log g⟩	slg	N	⟨log g⟩	slg	N
15 000–12 000			0	8.132	0.168	4	8.016	0.204	15
12 000–11 000			0	8.015	0.113	13	8.007	0.186	39
11 000–10 000			0	8.038	0.116	20	7.979	0.190	129
10 000–9000	7.938	0.084	9	8.026	0.106	30	8.027	0.169	153
9000-8000	7.921	0.124	85	8.049	0.127	44	8.040	0.179	128
8000–7000	7.941	0.208	81	8.022	0.126	17	8.085	0.183	234
7000–6000	7.961	0.210	38	7.915	0.151	26	8.039	0.185	249
6000–5000	7.886	0.326	8	7.717	0.153	12			0
Total:	7.935	0.184	221	7.995	0.158	166	8.039	0.185	947

Notes. Numbers ⟨log g⟩ are averages in the T_eff interval, and slg is the 1σ width of thedistribution, not the uncertainties of the average.

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