**Table 5:** Main characteristics derived for the IRAS sources identified as transition objects.
IRAS name	Other names	Spectral type	Spectral type	Reliability	Morphology
		our survey	(SIMBAD)	code $^\dagger$
10178-5958	PN G285.1-02.7 Hen 3-401	BeI	Be	AA	Bipolar [1]
10197-5750	Hen 3-404	A0Ie	A2Iabe	AA	Bipolar [2]
10215-5916		A7eI	K0	AA
11353-6037	PM 1-60	B5Ie		AA
11531-6111	PM 1-61	B8eI		AA
15066-5532	PM 2-15			AA
16594-4656	PN G340.3-03.2	Ae	B7	AA	Multipolar [3]
17074-1845	Hen 3-1347	B3eI	B3IIIe	AA
17086-2403	PN G359.8+08.9 PM 2-22		G5IV-V	AA
17291-2402	PN G002.5+05.1 PM 1-155			AA
17311-4924	PN G341.4-09.0 Hen 3-1428	B3Ie	B1IIe	AA
17347-3139	RPZM 28			AA	Bipolar [4]
17423-1755	PN G009.3+05.7 Hen 3-1475		Be	AA	Bipolar [5]
17466-3031	RPZM 42			AA
18062+2410	PN G050.6+19.7	B3e	B1IIIpe	AA
18442-1144	PN G022.0-04.3		A3V	AA
19016-2330	PN G013.1-13.2			AA
19590-1249	PN G029.1-21.2	B2eI	B1Ibe	AA
20462+3416	PN G076.6-05.7		B1Iae	AA
21546+4721	PN G095.0-05.5			AA
22023+5249	PN G099.3-01.9		Be	AA

$\dagger$ This code rates our confidence in the data presented, with A representing the maximum reliability. The first letter marks our confidence in the correct identification of the optical counterpart, and the second letter indicates how confident we are in the evolutionary classification assigned.

[1] García-Lario et al. (1999a); [2] Allen et al. (1980); [3] García-Lario et al. (1999b); [4] de Gregorio-Monsalvo et al. (2004); [5] Riera et al. (1995).