At the present time, 4109 deg2 have been searched (33 45 and 61, excluding the Galactic plane) and a catalogue of 1103 blue stellar objects has been built. It has been published in a series of eleven papers [2-12]. It contains 388 objects at 30, including 33 at 12 15. Fig. 1 shows the distribution on the sky of the 1103 objects. 433 spectroscopic identifications (397 stars and 36 QSOs) are already known, taken mainly from [1,19,35,46,47,55,57,59-65], catalogues of spectroscopically identified white dwarfs [41,43], the catalogue of cataclysmic variables [17] and the catalogue of subdwarfs [31].
106 FBS stars have published UBV colours [23,44] as well as seven FBS QSOs [55]. With the exception of FBS 1002+390 (U-B = -0.14 [34]), they all have U-B < -0.50 (Fig. 2). The FBS objects have been classified as B or N according to the ratio of the intensity of the red and blue regions of the spectra. The catalogue contains 862 B objects, 233 N and 8 others. According to the classification, in general, B objects should have a negative B-V, while N objects should have a positive B-V [9]. In fact, if most N objects have a positive B - V, a significant fraction of the B objects also have a positive B-V (Fig. 2).
Sixteen QSOs are of B type or 1.8% of all B type objects, while 20 are of N type or 8.5% of all N type; N type objects are therefore much more likely to be QSOs which however have about the same probability to be of N or B type. Nevertheless, among the eight FBS QSOs with z > 1, seven are of N type, while only one is of B type.
The positional accuracy for the first 429 objects (first four papers) is quoted as being about 1. Later the accuracy was increased to 05 [2]. An accurate optical position has been measured for 195 objects on the Digitized Sky Survey; the accuracy is 06 [54]. These positions are given in Table 1. We have compared the published FBS positions with sub-arcsecond accuracy positions for 104 objects of the first four papers and 117 objects of the last seven papers. After correcting for printing errors in the published positions of FBS 0649+716, 0935+416, 1559+369 and 1619+648, we found = 46, = 40 and = 9, = 7 respectively; these errors are substantially smaller than the initial estimates.
The magnitudes of the objects in the first four papers have been measured from the O Palomar Sky Survey prints, using the relationship between stellar diameters and magnitudes established by [26]; however in these papers, the PG magnitude, when available, was given rather than the FBS magnitude. In contrast, for the objects listed in the last seven papers, the magnitudes have been measured on both the O and E prints, with the calibration given by [32] and the V magnitude computed with the formula : V = E-(O-E)/3.2. The photometric accuracy, which was thought to be 0.5 mag in the first series of measurements, was improved to 0.3 mag starting with the fifth paper [2].
Name | (B1950) | (B1950) | ||
FBS 0004+330 | 00 04 57.58 | 33 00 49.2 | ||
FBS 0019+348 | 00 19 10.52 | 34 48 13.3 | ||
FBS 0019+401 | 00 19 44.22 | 40 09 12.4 | ||
FBS 0028+441 | 00 28 01.72 | 44 07 59.3 | ||
FBS 0028+435 | 00 28 53.76 | 43 32 32.1 | ||
FBS 0038+431 | 00 38 10.80 | 43 08 32.7 | ||
FBS 0043+343 | 00 43 09.54 | 34 18 11.0 | ||
FBS 0047+347 | 00 47 14.22 | 34 41 52.7 | ||
FBS 0051+417 | 00 51 36.77 | 41 47 08.8 | ||
FBS 0058+431 | 00 58 18.96 | 43 07 17.9 | ||
FBS 0125+351 | 01 25 14.97 | 35 06 10.5 | ||
FBS 0125+386 | 01 25 35.36 | 38 39 07.4 | ||
FBS 0127+408 | 01 27 00.52 | 40 47 19.5 | ||
FBS 0140+427 | 01 39 59.78 | 42 42 14.6 | ||
FBS 0150+396 | 01 50 06.88 | 39 41 00.0 | ||
FBS 0154+391 | 01 54 18.51 | 39 08 25.2 | ||
FBS 0156+439 | 01 56 40.53 | 43 58 47.4 | ||
FBS 0212+385 | 02 12 55.08 | 38 32 26.6 | ||
FBS 0217+343 | 02 17 17.08 | 34 20 00.4 | ||
FBS 0228+447 | 02 28 42.59 | 44 44 13.1 | ||
FBS 0233+373 | 02 33 37.67 | 37 21 17.7 | ||
FBS 0255+379 | 02 55 30.67 | 37 57 40.1 | ||
FBS 0306+333 | 03 06 07.77 | 33 20 01.4 | ||
FBS 0315+417 | 03 15 04.13 | 41 44 27.0 | ||
FBS 0421+740 | 04 21 26.14 | 74 00 46.2 | ||
FBS 0432+763 | 04 32 27.59 | 76 18 44.6 | ||
FBS 0437+756 | 04 37 51.88 | 75 33 21.5 | ||
FBS 0613+431 | 06 13 06.93 | 43 10 59.2 | ||
FBS 0614+769 | 06 14 01.33 | 76 52 53.3 | ||
FBS 0624+428 | 06 24 17.31 | 42 48 39.1 | ||
FBS 0632+663 | 06 32 03.44 | 66 15 21.6 | ||
FBS 0637+786 | 06 37 33.69 | 78 38 04.1 | ||
FBS 0639+391 | 06 39 14.98 | 39 11 22.0 | ||
Name | (B1950) | (B1950) | ||
FBS 0649+716 | 06 49 08.05 | 71 37 22.5 | ||
FBS 0652+799 | 06 52 50.66 | 79 55 54.5 | ||
FBS 0654+366 | 06 54 40.40 | 36 34 23.4 | ||
FBS 0702+616 | 07 02 14.87 | 61 38 29.6 | ||
FBS 0706+407 | 07 06 42.65 | 40 41 18.2 | ||
FBS 0716+365 | 07 16 52.62 | 36 29 01.9 | ||
FBS 0732+396 | 07 32 58.96 | 39 32 59.4 | ||
FBS 0742+653 | 07 42 41.23 | 65 20 24.7 | ||
FBS 0742+337 | 07 42 59.53 | 33 40 29.4 | ||
FBS 0744+818 | 07 44 27.07 | 81 49 30.3 | ||
FBS 0744+652 | 07 44 52.30 | 65 10 16.2 | ||
FBS 0747+729 | 07 47 53.47 | 72 57 44.2 | ||
FBS 0749+725 | 07 49 44.82 | 72 32 17.9 | ||
FBS 0752+769 | 07 52 40.64 | 76 54 28.6 | ||
FBS 0808+435 | 08 08 05.06 | 43 32 13.8 | ||
FBS 0808+628 | 08 08 05.58 | 62 45 24.2 | ||
FBS 0819+364 | 08 19 32.57 | 36 23 54.1 | ||
FBS 0821+676 | 08 21 33.89 | 67 37 07.7 | ||
FBS 0827+738 | 08 27 10.40 | 73 47 17.6 | ||
FBS 0836+619 | 08 36 33.96 | 61 58 32.2 | ||
FBS 0845+812 | 08 45 25.59 | 81 10 16.7 | ||
FBS 0848+437 | 08 48 22.96 | 43 45 22.7 | ||
FBS 0850+639 | 08 50 37.98 | 63 54 46.1 | ||
FBS 0904+643 | 09 04 58.96 | 64 22 06.4 | ||
FBS 0906+368 | 09 06 18.10 | 36 49 46.8 | ||
FBS 0914+656 | 09 14 51.16 | 65 36 45.7 | ||
FBS 0920+674 | 09 20 01.27 | 67 23 05.9 | ||
FBS 0920+366 | 09 20 49.65 | 36 36 35.2 | ||
FBS 0924+732 | 09 24 23.00 | 73 09 46.9 | ||
FBS 0926+850 | 09 26 34.50 | 85 01 39.0 | ||
FBS 0929+733 | 09 29 12.25 | 73 16 16.2 | ||
FBS 0932+437 | 09 32 12.72 | 43 44 31.0 | ||
Name | (B1950) | (B1950) | ||
FBS 0933+614 | 09 33 53.15 | 61 25 18.0 | ||
FBS 0935+679 | 09 35 18.71 | 67 54 00.8 | ||
FBS 0935+395 | 09 35 42.66 | 39 32 25.3 | ||
FBS 0938+374 | 09 38 24.45 | 37 26 03.6 | ||
FBS 0938+447 | 09 38 34.70 | 44 42 46.2 | ||
FBS 0941+664 | 09 41 18.63 | 66 25 20.8 | ||
FBS 0944+713 | 09 44 45.41 | 71 15 09.4 | ||
FBS 0950+664 | 09 50 09.49 | 66 22 30.9 | ||
FBS 0953+686 | 09 53 03.57 | 68 36 35.8 | ||
FBS 0954+697 | 09 54 24.61 | 69 43 20.5 | ||
FBS 0958+353 | 09 58 17.44 | 35 19 37.2 | ||
FBS 1002+437 | 10 02 37.27 | 43 47 17.2 | ||
FBS 1003+678 | 10 03 08.82 | 67 47 25.6 | ||
FBS 1007+382 | 10 08 04.69 | 38 16 48.9 | ||
FBS 1040+451 | 10 40 36.64 | 45 09 14.0 | ||
FBS 1054+436 | 10 54 35.66 | 43 37 10.6 | ||
FBS 1057+719 | 10 57 07.54 | 71 54 10.6 | ||
FBS 1102+347 | 11 02 54.97 | 34 41 47.0 | ||
FBS 1103+385 | 11 03 04.38 | 38 29 16.9 | ||
FBS 1104+408 | 11 04 54.15 | 40 49 08.5 | ||
FBS 1108+402 | 11 08 10.48 | 40 15 35.6 | ||
FBS 1112+668 | 11 12 19.28 | 66 48 23.4 | ||
FBS 1122+426 | 11 22 09.44 | 42 41 53.7 | ||
FBS 1125+634 | 11 25 45.85 | 63 21 16.2 | ||
FBS 1129+823 | 11 29 34.93 | 82 19 40.7 | ||
FBS 1133+754 | 11 33 32.66 | 75 23 30.2 | ||
FBS 1138+648A | 11 38 45.38 | 64 49 08.6 | ||
FBS 1138+648B | 11 38 46.11 | 64 49 12.1 | ||
FBS 1139+437 | 11 39 35.91 | 43 40 54.9 | ||
FBS 1140+719 | 11 40 48.57 | 71 57 58.5 | ||
FBS 1141+406 | 11 41 40.55 | 40 41 08.0 | ||
FBS 1147+673 | 11 47 46.03 | 67 15 28.5 | ||
FBS 1148+444 | 11 48 47.18 | 44 29 23.1 | ||
Name | (B1950) | (B1950) | ||
FBS 1149+394 | 11 49 27.95 | 39 25 08.7 | ||
FBS 1150+334 | 11 50 16.53 | 33 23 59.8 | ||
FBS 1156+432 | 11 56 13.19 | 43 15 48.2 | ||
FBS 1201+437 | 12 01 51.15 | 43 47 39.3 | ||
FBS 1211+393 | 12 11 04.32 | 39 17 34.8 | ||
FBS 1223+665 | 12 23 13.26 | 66 31 26.9 | ||
FBS 1229+383 | 12 29 03.27 | 38 19 15.0 | ||
FBS 1229+710 | 12 29 28.28 | 71 00 47.2 | ||
FBS 1230+417 | 12 30 00.95 | 41 45 51.3 | ||
FBS 1231+828 | 12 31 46.59 | 82 50 21.8 | ||
FBS 1232+379 | 12 32 28.31 | 37 54 14.5 | ||
FBS 1235+699 | 12 35 12.88 | 69 58 13.2 | ||
FBS 1240+631 | 12 40 27.96 | 63 06 21.5 | ||
FBS 1248+374 | 12 48 44.76 | 37 23 00.3 | ||
FBS 1249+433 | 12 49 48.58 | 43 20 24.5 | ||
FBS 1255+447 | 12 55 01.75 | 44 45 46.8 | ||
FBS 1311+664 | 13 11 50.12 | 66 27 01.9 | ||
FBS 1315+645 | 13 15 09.88 | 64 31 09.8 | ||
FBS 1315+447 | 13 15 49.63 | 44 43 19.5 | ||
FBS 1316+446 | 13 16 01.31 | 44 40 06.0 | ||
FBS 1324+448 | 13 24 54.58 | 44 50 36.4 | ||
FBS 1335+369 | 13 35 38.77 | 36 52 50.6 | ||
FBS 1338+666 | 13 38 03.38 | 66 35 50.6 | ||
FBS 1340+813 | 13 40 40.59 | 81 18 10.8 | ||
FBS 1351+640 | 13 51 46.29 | 64 00 29.0 | ||
FBS 1352+386 | 13 52 26.75 | 38 39 18.4 | ||
FBS 1352+451 | 13 52 49.55 | 45 08 13.9 | ||
FBS 1356+389 | 13 56 24.73 | 38 58 27.6 | ||
FBS 1359+411 | 13 59 12.50 | 41 09 01.9 | ||
FBS 1401+865 | 14 01 11.14 | 86 29 42.8 | ||
FBS 1402+436 | 14 02 37.67 | 43 41 26.9 | ||
FBS 1413+757 | 14 13 08.72 | 75 40 15.8 | ||
Name | (B1950) | (B1950) | ||
FBS 1429+373 | 14 29 54.34 | 37 19 41.7 | ||
FBS 1437+398 | 14 37 18.97 | 39 49 35.3 | ||
FBS 1440+753 | 14 40 14.76 | 75 18 20.0 | ||
FBS 1444+637 | 14 44 57.08 | 63 41 53.2 | ||
FBS 1449+440 | 14 49 36.48 | 44 06 03.6 | ||
FBS 1449+642 | 14 49 37.67 | 64 15 46.8 | ||
FBS 1452+762 | 14 52 16.36 | 76 12 10.1 | ||
FBS 1500+752 | 15 00 43.03 | 75 10 33.1 | ||
FBS 1501+664 | 15 01 24.25 | 66 24 01.4 | ||
FBS 1513+442 | 15 13 02.08 | 44 12 40.7 | ||
FBS 1522+663 | 15 22 16.88 | 66 15 31.0 | ||
FBS 1523+363 | 15 23 16.94 | 36 15 38.0 | ||
FBS 1534+389 | 15 34 32.03 | 38 55 52.6 | ||
FBS 1539+355 | 15 36 02.86 | 35 28 08.8 | ||
FBS 1551+719 | 15 51 40.69 | 71 54 05.0 | ||
FBS 1554+403 | 15 54 04.46 | 40 20 24.6 | ||
FBS 1557+448 | 15 57 08.98 | 44 49 30.8 | ||
FBS 1559+369 | 15 59 32.42 | 36 57 20.2 | ||
FBS 1602+408 | 16 02 43.08 | 40 49 06.3 | ||
FBS 1603+369 | 16 03 43.62 | 36 57 42.3 | ||
FBS 1605+684 | 16 05 29.76 | 68 22 07.7 | ||
FBS 1605+627 | 16 05 47.96 | 62 40 55.8 | ||
FBS 1607+439 | 16 07 53.88 | 43 54 10.5 | ||
FBS 1619+749 | 16 19 47.45 | 74 55 38.0 | ||
FBS 1619+648 | 16 19 55.70 | 64 43 01.2 | ||
FBS 1634+706 | 16 34 51.56 | 70 37 37.5 | ||
FBS 1636+351 | 16 36 36.52 | 35 06 03.8 | ||
FBS 1638+388 | 16 38 34.72 | 38 48 04.0 | ||
FBS 1640+362 | 16 40 08.90 | 36 09 43.2 | ||
FBS 1641+399 | 16 41 17.55 | 39 54 10.7 | ||
FBS 1641+388 | 16 41 18.89 | 38 46 42.4 | ||
FBS 1648+371 | 16 48 22.63 | 37 06 16.4 | ||
FBS 1648+407 | 16 48 40.95 | 40 42 25.3 | ||
Name | (B1950) | (B1950) | ||
FBS 1656+354 | 16 56 01.70 | 35 25 05.1 | ||
FBS 1657+344 | 16 57 01.28 | 34 23 23.1 | ||
FBS 1658+440 | 16 58 17.09 | 44 05 23.6 | ||
FBS 1715+409 | 17 15 29.57 | 40 39 44.6 | ||
FBS 1715+424 | 17 15 45.05 | 42 29 18.8 | ||
FBS 1716+394 | 17 16 22.39 | 39 19 49.3 | ||
FBS 1722+356 | 17 22 48.91 | 35 36 55.3 | ||
FBS 1743+440 | 17 43 26.45 | 44 05 51.0 | ||
FBS 1745+420 | 17 44 55.66 | 42 04 44.0 | ||
FBS 1755+663 | 17 55 41.53 | 66 19 16.4 | ||
FBS 1756+394 | 17 55 55.40 | 39 21 14.2 | ||
FBS 1756+441 | 17 56 11.82 | 44 11 07.8 | ||
FBS 1756+352 | 17 56 30.04 | 35 09 17.3 | ||
FBS 1800+686 | 18 00 26.61 | 68 35 56.0 | ||
FBS 1810+374 | 18 10 39.33 | 37 24 40.4 | ||
FBS 1815+381 | 18 15 39.96 | 38 09 43.1 | ||
FBS 1820+809 | 18 20 54.40 | 80 54 13.7 | ||
FBS 1821+643 | 18 21 36.76 | 64 20 18.7 | ||
FBS 1822+352 | 18 22 21.32 | 35 14 38.3 | ||
FBS 1822+414 | 18 22 21.69 | 41 27 33.2 | ||
FBS 1833+447 | 18 33 25.29 | 44 45 48.6 | ||
FBS 1833+434 | 18 33 45.70 | 43 25 00.7 | ||
FBS 2149+425 | 21 49 04.38 | 42 32 39.1 | ||
FBS 2152+408 | 21 52 47.31 | 40 49 58.0 | ||
FBS 2212+421 | 22 12 29.04 | 42 08 08.5 | ||
FBS 2246+414 | 22 47 00.80 | 41 28 01.1 | ||
FBS 2248+446 | 22 48 19.36 | 44 41 14.5 | ||
FBS 2249+391 | 22 49 45.92 | 39 05 20.2 | ||
FBS 2302+427 | 23 02 43.64 | 42 46 33.8 | ||
FBS 2308+425 | 23 08 26.99 | 42 33 51.2 | ||
FBS 2315+443 | 23 15 48.38 | 44 20 01.2 | ||
FBS 2340+422 | 23 40 54.17 | 42 17 39.9 | ||
Comparison of the FBS and photoelectric V magnitudes for the objects in the last seven papers gives = 0.06 mag and = 0.46 mag. For 29 objects from the first four papers, we have = -0.40 mag, = 0.75 mag. This confirms the significant improvement of the photometric accuracy achieved in the second part of the catalogue. However, the accuracy seems to be 0.75 mag and 0.45 mag in the first and second part respectively, rather than the estimated 0.5 mag and 0.3 mag.