2 Sample selection

Our targets for the present program were 16 LSB Giant galaxies meeting the ``diffuseness'' criterion stated in Sect. 1. The objects were culled from Knezek (1993), Sprayberry et al. (1995b), and Pickering et al. (1997), and all have available optical surface photometry. Thirteen of our targets have previously been observed in H I by other workers, but the published H I parameters were uncertain or incomplete (see below). For the other 3 galaxies, no H I data were previously available. Some basic parameters for our target galaxies are summarized in Table 1.

   

Table 1: Basic parameters for target galaxies compiled from NED and LEDA

Ident.	RA	Dec	Classification		$m_{\rm b}$	D25	b/a	i	PA	$V_{\rm r}$	$\sigma(V)$
	(1950.0)		LEDA	NED	mag	'		$^\circ$	$^\circ$	kms-1	kms-1
UGC 568	00 52 35.5	-01 19 01	S?	Sd	15.08	1.17	0.70	40		13197	204
UGC 1752	02 13 30.0	24 40 00	Sc	SA(s)cd	16.5	1.55	1.00	0:	0:	17847	60
PGC 135657	02 37 38.7	-01 59 18	Sb	Sc	15.47	0.78		38	63	12701	60
UGC 2936	04 00 12.6	01 49 36	SBc	SB(s)d	15.00	2.51	0.27	78	30	3817	125
UGC 3140	04 40 20.1	00 31 35	Sbc	SA(rs)c:	13.30	1.78	0.91	0:	175	4633	60
NGC 2770	09 06 29.8	33 19 53	Sc	SA(s)c:	12.77	3.66	0.30	79	148	1947	63
PGC 135754	10 34 52.9	02 20 57	Sc	Sc	16.34			49		21335	60
F568-6	10 37 08.5	21 06 24	Scd	Sd/p	15.28	1.67	0.79	38		13830
UGC 6614	11 36 39.1	17 25 14	Sa	(R)SA(r)a:	14.37	2.02	0.86	35	0:	6351	60
Malin-1	12 34 27.3	14 36 15		S	16.20	0.20	0.93	45	45	24750
PGC 45080	13 00 42.6	01 44 12	Sc	Sc	15.61	0.79	0.22	72	84	12264	295
UGC 9024	14 04 21.0	22 18 28	Sa	S:	16.0	2.09	0.95	37	0:	2323
F530-1	21 05 21.5	26 15 00	Sc	S(r)	16.31	0.47	0.74			14340
F533-3	22 14 53.3	24 57 48	SBc	SBc(r)	15.43	0.88	0.65	65:	165:	12669
NGC 7589	23 15 41.9	-00 00 45	Sb	SAB(rs)a:	15.01	1.07	0.62	58	60	8938	219
PGC 71626	23 27 58.2	-02 44 18	SBc	SB(r)b pec	15.14	1.78	0.59	61	65	9520	247

Coordinates, B magnitudes, angular sizes, axial ratios, and radial velocities were culled from the NED database. Position angles and scatter in the published radial velocity values [$\sigma(V)$] were taken from the LEDA database, and inclinations were obtained from the various references given in Table 6 (discussed below). Inclinations and position angles marked with a colon (:) were estimated by us from inspection of the Digitized Sky Survey.