The relation for planetary nebulae | Astronomy & Astrophysics (A&A)

Free Access

Table 2:

The results of the $\Sigma -D$ and L-D fits of PN samples defined using the different methods of distance determination.
No.	Sample^a	$\beta_{_{\Sigma - D}}^b$	$r_{_{\Sigma- D}}^b$	$\alpha_{_{L-D}}^b$	r_{_{L - D}}^b	N^b
1	Trigonometric Parallax	$1.79 \pm 0.22$	-0.90	$-0.21 \pm 0.22$	00.23	18
2	Trigonometric Parallax $\dag$	$2.02 \pm 0.18$	-0.95	00.02 $\pm$ 0.18	-0.02	17
3	Geometrical (trig. parall. + expan.)	$2.26 \pm 0.26$	-0.86	00.26 $\pm$ 0.26	-0.19	30
4	Geometrical (trig. parall. + expan.) $\dag$	$2.44\pm0.22$	-0.91	00.44 $\pm$ 0.22	-0.36	29
5	Gravitational	$1.42\pm0.37$	-0.66	-0.58 $\pm$ 0.37	00.33	22
6	Gravitational $\dag$	$2.53\pm0.31$	-0.89	00.53 $\pm 0.31$	-0.38	20
7	Spectroscopic	$2.57 \pm 0.36$	-0.91	00.57 $\pm 0.36$	-0.43	13
8	Extinction	$1.69\pm0.38$	-0.80	$-0.31 \pm0.38$	00.25	13
9	USNO-PN	$2.38\pm0.56$	-0.90	00.38 $\pm$ 0.56	-0.32	06

^a For the first eight samples, PNe are extracted from the SSV and Ph02; for USNO-PN - see Table 3; ^b the parameters of the fit ( $\beta$ and $\alpha$ , respectively) and the correlation coefficient r are given for each sample. The number of PNe in the sample is given in the last column (N).

Source LaTeX | All tables | In the text

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.