1 Introduction

The majority of the first surveys of H$\alpha$ emission-line objects have been done with objective-prism plates and further spectroscopic follow-up is necessary in order to determine the true nature of them. With this in mind five years ago we started a spectroscopic survey of these objects at the European Southern Observatory (ESO). Previous results of this kind of work led to the discovery of a new WN4 Wolf-Rayet star (Pereira et al. 1998) and to the identification of 16 new Be stars and 7 new T Tauri stars in the Canis Majoris region (Pereira et al. 2001).

In the present work we concentrate on some stars of Sanduleak & Stephenson's (1973) list, hereafter SS73. The SS73 survey consists of 179 stars, several of which are located in the direction of the Galactic Center but with concentrations in other regions of the Galaxy too (Figs. 1a-c of SS73). The first paper dedicated to investigate most of the stars from SS73 sample was by Allen (1978, hereafter A78). As result of Allen's (1978) investigation (as well as from SS73) the number of symbiotic stars doubled. Although most of the stars from the sample of SS73 were investigated by several other authors there are still a number of objects that deserve spectroscopic follow-up. This is illustrated by the recent analysis by us for two stars of this sample, SS73 11 and SS73 71. The former may be a LBV or a post-AGB object (Landaberry et al. 2001) while the latter is a symbiotic object (Pereira et al. 2002). Moreover even nowadays there are some stars in this survey whose nature is either still not well known (such as SS73 7, and 52) or with poor information about their nature, as is the case of SS73 80, 83 and also SS73 118 which is M-supergiant. Another reason for this spectroscopy survey is given by stars as SS73 39 (Hen 2-91), SS73 156 (MWC 922) and SS73 170 which belong to the list of unclassified B[e] stars defined by Lamers et al. (1998, hereafter L98).

The purpose of this paper is to present homogeneous spectra of 33 poorly-studied objects, suggesting classifications for all of them. In Sect. 2 we describe the observations and the data reduction procedures. In Sect. 3 we discuss the observed spectra of each object. In Sect. 4 our findings are summarized.

 

 

Table 1: Observation log of SS73 stars.

Star	Date	Wavelength	Exp
		range	time
			(s)
SS73 1	1997 Nov. 07	3680 Å-7515 Å	900
SS73 2	1998 Jan. 19	3150 Å-5110 Å	1200
	1999 Mar. 03	3380 Å-7200 Å	900
			60
	1999 Mar. 04	3175 Å-5110 Å	900
SS73 3	1998 Jan. 19	3150 Å-5110 Å	900
	1999 Mar. 03	3380 Å-7200 Å	30
			180
	1999 Mar. 04	3175 Å-5110 Å	900
			180
SS73 6	1997 Nov. 07	3680 Å-7515 Å	1200
			300
	1998 Jan. 19	3150 Å-5110 Å	1200
SS73 7	1999 Mar. 02	3350 Å-7190 Å	900
	1999 Mar. 03	3380 Å-7200 Å	180
	1999 Mar. 04	3175 Å-5110 Å	1200
SS73 12	1998 Jan. 19	3150 Å-5110 Å	1200
	1998 Mar. 14	3540 Å-7413 Å	200
			60
SS73 16	2001 Feb. 03	3674 Å-8639 Å	1200
SS73 17	1999 Mar. 03	3380 Å-7200 Å	60
	1999 Mar. 04	3175 Å-5110 Å	900
SS73 24	2001 Fev. 03	3674 Å-8639 Å	600
			60
	2001 Jun. 14	2686 Å-6200 Å	900
SS73 28	1997 Jan. 19	3208 Å-7027 Å	600
	1997 Jan. 18	3235 Å-5164 Å	900
SS73 31	1997 Feb. 23	3250 Å-5080 Å	900
	1997 Feb. 24	3490 Å-7400 Å	300
			300
	1999 Apr. 16	3547 Å-7360 Å	1200
SS73 33	1997 Feb. 23	3250 Å-5080 Å	900
	1997 Feb. 24	3490 Å-7400 Å	600
	1999 Apr. 16	3547 Å-7360 Å	1200
			600
SS73 34	2001 Feb. 03	3674 Å-8639 Å	900
SS73 35	1997 Feb. 23	3250 Å-5080 Å	300
			600
	1997 Feb. 24	3490 Å-7400 Å	240
			120
SS73 39	1997 Feb. 24	3490 Å-7400 Å	300
	1997 Feb. 24	3490 Å-7400 Å	300
SS73 41	1997 Feb. 24	3490 Å-7400 Å	600
	1997 May 21	3600 Å-7400 Å	420
	1997 May 21	3600 Å-7400 Å	10
SS73 44	1997 Feb. 25	4100 Å-7492 Å	600
	1999 Mar. 05	3150 Å-5103 Å	1500
SS73 51	1998 Mar. 14	3540 Å-7413 Å	900
	1999 Mar. 04	3175 Å-5110 Å	1200

 

Table 1: continued.

SS73 52	1997 May 22	3540 Å-7410 Å	600
	1998 Mar. 14	3540 Å-7413 Å	900
	2001 Jun. 09	3300 Å-8550 Å	900
	2001 Jun. 13	2686 Å-6200 Å	1200
SS73 62	2000 Mar. 25	3704 Å-8740 Å	620
			60
SS73 63	2001 Jun. 09	3300 Å-8550 Å	600
			30
SS73 67	2001 Jun. 09	3300 Å-8550 Å	1200
SS73 80	2000 Mar. 25	3704 Å-8740 Å	600
	2001 Jun. 15	3250 Å-5660 Å	1200
SS73 83	2000 Mar. 25	3704 Å-8740 Å	900
	2001 Jun. 15	3250 Å-5660 Å	1320
SS73 116	1997 Jul. 20	3550 Å-7383 Å	1200
SS73 118	2000 Mar. 24	3661 Å-8840 Å	300
SS73 120	2000 Mar. 25	3704 Å-8740 Å	600
			60
SS73 125	2001 Jun. 09	3300 Å-8550 Å	120
	2001 Jun. 09	3300 Å-8550 Å	900
SS73 156	2001 Jun. 15	3250 Å-5660 Å	1200
	2001 Jun. 09	3300 Å-8550 Å	1200
SS73 158	2000 Mar. 25	3704 Å-8740 Å	600
SS73 170	1999 Jun. 20	3460 Å-7250 Å	900
	1999 Jun. 20	3460 Å-7250 Å	300
SS73 173	2001 Sep. 24	3400 Å-8560 Å	1800
SS73 175	1999 Jun. 20	3460 Å-7250 Å	300
			600
	2001 Jun. 14	2686 Å-6205 Å	720