1999MNRAS.309.1043S

Query : 1999MNRAS.309.1043S

1999MNRAS.309.1043S - Mon. Not. R. Astron. Soc., 309, 1043-1050 (1999/November-2)

A study of optically featureless objects from the EC Survey: searching for new southern BL Lac objects.

SEFAKO R.R., GLASS I.S., KILKENNY D., DE JAGER O.C., STOBIE R.S., O'DONOGHUE D. and KOEN C.

Abstract (from CDS):

In an attempt to discover new southern BL Lac objects, 14 optically featureless objects from the Edinburgh-Cape Survey were selected. Optical polarimetry and spectroscopy, radio and IR observations were carried out in order to improve their classifications. The 14 objects were examined according to special criteria that are described. Their UBV and JHK colour-colour distributions, spectrograms, radio observations and visible-region polarimetry were utilized to conclude that the selected objects are not BL Lacs. Most of them are apparently not extragalactic objects. It is suggested that four of the 14 candidates are DC white dwarfs, one is a QSO, three are DA white dwarfs or sdB subdwarfs, one is a cataclysmic variable, one is a DAO/sdO and another is possibly a DA+dM binary (composite system with a `primary' hot white dwarf and a `secondary' M-type main-sequence dwarf) or a cataclysmic variable. One object is likely to be a subdwarf, while two remain unclassifiable.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): methods: observational - techniques: miscellaneous - surveys - subdwarfs - white dwarfs - BL Lacertae objects: general

CDS comments: MH 2136-38 in Table 2 is BL Lac 2136-428 from Hawkins et al. 1991A&A...248..421H, [HVH91] 2136-428 in SIMBAD.

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 QSO B0048-09 BLL 00 50 41.3172421464 -09 29 05.210474100 16.74 16.39 16.22 16.14   ~ 480 2
2 1RXS J014126.8-092857 BLL 01 41 25.83216015 -09 28 43.6742470   16.94 16.55 17.21   ~ 302 1
3 QSO B0208-512 BLL 02 10 46.2004407600 -51 01 01.893013392   17.10 16.93 14.82   ~ 485 1
4 PKS J0303-2407 BLL 03 03 26.5025589984 -24 07 11.426291220   16.55 16.18     ~ 249 1
5 MCT 0309-2105 WD* 03 11 58.1545646376 -20 54 08.617153752   15.747 15.615     DC 14 0
6 ESO 362-21 BLL 05 22 57.98464178 -36 27 30.8512953   15.26 14.62 14.48   ~ 873 2
7 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 924 2
8 BD-03 2179 HS* 08 02 14.8870205088 -03 58 16.343922324 8.8 10.044 10.29 10.64 10.60 sdO 56 0
9 PG 0959-085 HS* 10 01 33.2732402688 -08 42 50.463552636   16.05 16.25     sdOD 15 0
10 EC 10346-1234 WD? 10 37 09.3654178368 -12 49 53.140114992   15.86 16.14     DAO/sdO 7 0
11 V* V393 Hya CV* 11 00 17.4526467072 -29 51 59.016154968   15.807 15.812 15.608   ~ 19 0
12 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
13 HE 1115-1735 QSO 11 18 10.6833395784 -17 51 59.356627416   16.29 16.14 16.13   ~ 25 0
14 EC 12062-3024 HS? 12 08 49.3431104544 -30 41 36.202137432   16.0 15.94 16.1   ~ 7 0
15 EC 12206-1835 WD* 12 23 13.5655138512 -18 52 11.281952964   16.71 16.61     DC 11 0
16 EC 12393-1318 WD* 12 41 55.9201678285 -13 35 01.266694623   15.95 15.79 15.88   DC 14 0
17 EC 12489-2750 WD* 12 51 41.0422814136 -28 06 47.307424752   15.91 16.22 16.0   DA1 14 0
18 EC 14411-0750 HS? 14 43 48.2684985288 -08 03 12.616193304   16.5 16.51     sd? 6 0
19 ESO 514-1 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 815 3
20 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
21 PKS J2009-4849 BLL 20 09 25.3903899240 -48 49 53.725051056   15.75 12.81 11.41   ~ 604 1
22 EC 20220-2243 WD* 20 24 59.4372642000 -22 33 23.120735364 14.95 16.10 16.45     DAwk 10 0
23 EC 20418-2419 WD* 20 44 48.2230624944 -24 08 55.739425164 14.87 15.80 15.78     DB/sdBHe 11 0
24 LP 872-48 WD* 20 52 16.8416391600 -22 06 33.421405608 14.57 15.17 15.00     DC 24 0
25 MCT 2109-2934 WD* 21 12 40.6401654648 -29 22 17.960928708 14.48 15.30 15.21 15.41   DC 17 0
26 QSO B2136-428 BLL 21 39 24.1733820912 -42 35 20.465859048   16.50 16.2 15.7   ~ 97 1
27 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1
28 1RXS J230846.7-221955 BLL 23 08 46.8647061744 -22 19 48.991643580   18.60 17.6 16.51   ~ 32 0
29 MCG-07-47-031 BLL 23 19 05.8954756632 -42 06 48.297034584   16.60 15.46     ~ 121 0
30 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 500 1

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