Table 1: XMM-Newton sources in the L1551 cloud region, as detected in the combined EPIC pn+MOS1+MOS2 image. If a counterpart is present in the SIMBAD catalog its name is listed in the "Id'' field. If only a magnitude is given, the counterpart is only present in the USNO A2 catalog. Counterparts have been searched within a radius of 15 arcsec from the X-ray source position. R magnitudes and B-R colors are from the USNO catalog. The X-ray count rate is expressed in "MOS equivalent'' units. r is the distance between the X-ray source and the candidate counterpart. The last column gives the number of the spectrum of the source as used in Table 2.
Source RA (J2000) Dec (J2000) Count rate r R $B\!-\!R$ Id Spec.
      ${\rm (ks)^{-1}}$ arcsec        
1 4 30 53.60 +18 00 01.1 1.95 $\pm$ 0.35 - - - - -
2 4 31 01.40 +18 01 53.1 1.68 $\pm$ 0.28 - - - - -
3 4 31 02.75 +18 10 48.0 0.38 $\pm$ 0.10 - - - - -
4 4 31 03.71 +17 57 44.7 1.87 $\pm$ 0.34 - - - - -
5 4 31 04.19 +18 07 23.3 3.55 $\pm$ 0.30 - - - - S27
6 4 31 05.66 +18 03 22.6 33.23 $\pm$ 0.92 2.1 - - JH188 S26
7 4 31 08.36 +18 01 36.0 0.98 $\pm$ 0.19 - - - - -
8 4 31 11.09 +18 21 58.7 5.40 $\pm$ 1.68 - - - - -
9 4 31 11.37 +18 17 21.2 0.81 $\pm$ 0.14 - - - - -
10 4 31 15.63 +18 21 07.8 0.37 $\pm$ 0.11 - - - - -
11 4 31 15.91 +18 20 09.0 10.27 $\pm$ 0.54 2.5 - - [BHS98] MHO 9 S25
12 4 31 16.94 +17 58 02.8 7.83 $\pm$ 1.49 9.5 - - [GRL2000] 10 -
13 4 31 17.21 +18 02 19.8 0.81 $\pm$ 0.17 - - - - -
14 4 31 17.31 +18 09 28.2 0.54 $\pm$ 0.10 - - - - -
15 4 31 21.21 +17 59 49.8 0.89 $\pm$ 0.21 - - - - -
16 4 31 23.32 +18 08 07.1 0.81 $\pm$ 0.11 - - - - S24
17 4 31 24.09 +18 00 24.9 8.36 $\pm$ 0.48 3.2 - - [BHS98] MHO 4 S23
18 4 31 24.58 +18 11 40.9 0.93 $\pm$ 0.12 - - - - -
19 4 31 25.32 +18 16 19.3 618.22 $\pm$ 3.20 2.4 - - HD 285845 S22
20 4 31 26.88 +18 07 58.8 2.37 $\pm$ 0.18 - - - - S21
21 4 31 29.03 +18 03 38.7 0.84 $\pm$ 0.18 - - - - -
22 4 31 30.18 +18 20 42.1 1.73 $\pm$ 0.25 - - - - -
23 4 31 30.21 +18 05 33.4 0.34 $\pm$ 0.08 - - - - -
24 4 31 30.24 +17 56 31.6 0.50 $\pm$ 0.14 - - - - -
25 4 31 30.78 +17 59 06.6 1.06 $\pm$ 0.19 - - - - -
26 4 31 34.04 +18 08 07.2 1.40 $\pm$ 0.15 6.3 - - HH 154 S20
27 4 31 34.04 +18 02 19.3 1.05 $\pm$ 0.30 - - - - -
28 4 31 36.06 +18 13 43.9 0.84 $\pm$ 0.12 0.7 16.9 2.2 CoKu Tau 2 -
29 4 31 38.32 +18 13 59.4 19.06 $\pm$ 0.51 2.3 - - HL Tau S19
30 4 31 38.63 +18 16 17.0 0.45 $\pm$ 0.09 - - - - -
31 4 31 39.99 +18 13 59.2 135.09 $\pm$ 1.35 1.4 - - XZ Tau S18
32 4 31 40.34 +18 12 12.5 6.06 $\pm$ 0.27 - - - - -
33 4 31 40.82 +18 17 35.3 0.44 $\pm$ 0.10 - - - - -
34 4 31 43.31 +18 03 18.9 0.76 $\pm$ 0.15 - - - - -
35 4 31 44.01 +18 10 34.7 1.16 $\pm$ 0.12 1.5 - - [SB86] L1551 2 S16
36 4 31 44.87 +18 10 06.7 0.35 $\pm$ 0.08 - - - - -
37 4 31 49.74 +18 13 05.2 2.89 $\pm$ 0.25 - - - - S15
38 4 31 51.43 +18 14 58.7 0.69 $\pm$ 0.15 - - - - -
39 4 31 54.13 +18 08 24.6 0.48 $\pm$ 0.11 11.4 18.6 0.6 - -
40 4 31 55.24 +18 01 20.7 0.91 $\pm$ 0.17 - - - - -
41 4 31 55.75 +18 07 07.7 0.35 $\pm$ 0.08 - - - - -
42 4 31 56.05 +17 59 09.0 1.45 $\pm$ 0.29 12.9 19.3 0.8 - -
43 4 31 57.54 +18 09 29.8 0.24 $\pm$ 0.07 13.6 17.9 1.9 - -
44 4 31 58.02 +18 21 38.0 80.44 $\pm$ 1.58 3.7 - - V710 Tau A,B S14
45 4 31 58.72 +18 18 42.5 1.55 $\pm$ 0.22 1.3 - - [FK83] LDN1551 S13
46 4 31 59.26 +18 16 59.6 1.89 $\pm$ 0.20 5.1 - - [SB86] L1551 3 S12
47 4 31 59.48 +18 13 08.9 1.18 $\pm$ 0.14 - - - - S11
48 4 31 59.53 +18 01 12.1 1.37 $\pm$ 0.20 - - - - -
49 4 32 01.30 +18 05 02.2 6.25 $\pm$ 0.34 - - - - S10
50 4 32 01.30 +18 06 59.6 0.48 $\pm$ 0.10 - - - - -
51 4 32 02.17 +18 09 11.9 0.15 $\pm$ 0.05 - - - - -
52 4 32 02.73 +17 58 38.6 2.77 $\pm$ 0.35 - - - - -


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