2003A&A...403..187F

Query : 2003A&A...403..187F

2003A&A...403..187F - Astronomy and Astrophysics, volume 403187-203 (2003/5-3)

An XMM-Newton-based X-ray survey of pre-main sequence stellar emission in the L1551 star-forming complex.

FAVATA F., GIARDINO G., MICELA G., SCIORTINO S. and DAMIANI F.

Abstract (from CDS):

We present a study of the X-ray sources present in the nearby L1551 star forming region, based on a deep XMM-Newton observation complemented with Chandra data for the brightest sources. Most known pre-main sequence stars in the region have been detected, most of them with sufficient statistics to allow a detailed study of the temporal and spectral characteristics of their X-ray emission. Significant temporal (and spectral) variability on both short and long time scales is visible for most of the stars. In particular XZ Tau shows large-amplitude variations on time scales of several hours with large changes in the intervening absorption, suggestive of the X-ray emission being eclipsed by the accretion stream (and thus of the X-ray emission being partly or totally accretion-induced). The coronal metal abundance of the WTTS sources is clustered around Z≃0.2, while the CTTS sources span almost two orders of magnitudes in coronal Z, even though the photospheric abundance of all stars in the L1551 is likely to be very similar. Some individual elements (notably Ne) appear to be systematically enhanced with respect to Fe in the WTTS stars. The significant differences between the spectral and temporal characteristics of the CTTS and WTTS populations suggest that a different emission mechanism is (at least partly) responsible for the X-ray emission of the two types of stars.

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Journal keyword(s): ISM: individual objects: L1551 - stars: formation - stars: pre-main sequence - X-rays: stars

Nomenclature: Table 1: [FGM2003] NN (Nos 1-81). Table 2: [FGM2003] SNN (Nos S1-S27).

Simbad objects: 84

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Number of rows : 84
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 [GBA2007] 1261 X 04 30 53.60 +18 00 01.1           ~ 2 0
2 [GBA2007] 1266 X 04 31 01.40 +18 01 53.1           ~ 2 0
3 [BFR2003] 2 X 04 31 02.75 +18 10 48.0           ~ 4 0
4 [GBA2007] 1269 X 04 31 03.71 +17 57 44.7           ~ 2 0
5 [FGM2003] S27 X 04 31 04.17 +18 07 18.9           ~ 3 0
6 LP 415-1166 PM* 04 31 05.810832 +18 03 21.14316   17.22 15.86 15.67   ~ 15 1
7 [BFR2003] 6 X 04 31 08.36 +18 01 36.0           ~ 3 0
8 [FGM2003] 8 X 04 31 11.09 +18 21 58.7           ~ 1 0
9 [FGM2003] 9 X 04 31 11.37 +18 17 21.2           ~ 1 0
10 [GBA2007] 1278 X 04 31 15.63 +18 21 07.8           ~ 2 0
11 VSS XI-2 TT* 04 31 15.7844819592 +18 20 07.067360328     15.72     M4.25 60 0
12 [FGM2003] 14 X 04 31 17.11 +18 09 26.7           ~ 3 0
13 [FGM2003] 12 Rad 04 31 17.2 +17 58 09           ~ 3 0
14 [FGM2003] 13 X 04 31 17.28 +18 02 16.1           ~ 3 0
15 [GBA2007] 1286 X 04 31 21.21 +17 59 49.8           ~ 3 0
16 XMMU J043123.4+180805 X 04 31 23.35 +18 08 04.2           ~ 4 0
17 2MASS J04312405+1800215 LM* 04 31 24.0577715784 +18 00 21.456961776   20.38 18.678   14.32 M7 84 0
18 [FGM2003] 18 X 04 31 24.56 +18 11 39.5           ~ 3 0
19 HD 285845 Or* 04 31 25.1383575216 +18 16 16.731197940   11.06 10.31     G5 37 0
20 XMMU J043126.9+180756 X 04 31 26.89 +18 07 55.7           ~ 4 0
21 [GBA2007] 1301 X 04 31 29.03 +18 03 38.7           ~ 2 0
22 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 823 1
23 [FGM2003] 23 X 04 31 30.17 +18 05 31.2           ~ 3 0
24 [GBA2007] 1305 X 04 31 30.18 +18 20 42.1           ~ 2 0
25 [GBA2007] 1306 X 04 31 30.24 +17 56 31.6           ~ 2 0
26 [GBA2007] 1308 X 04 31 30.78 +17 59 06.6           ~ 2 0
27 [FGM2003] 27 X 04 31 33.98 +18 02 16.1           ~ 3 0
28 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
29 EM* LkHA 358 TT* 04 31 36.1433863008 +18 13 43.204853460     19.0     M0.9 97 0
30 V* HL Tau Or* 04 31 38.5107609312 +18 13 57.859747968   15.89 14.49 14.39   K5 1546 0
31 [GBA2007] 1320 X 04 31 38.63 +18 16 17.0           ~ 2 0
32 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 797 0
33 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 466 2
34 2XMM J043140.2+181212 AG? 04 31 40.33 +18 12 12.5           ~ 4 0
35 [GBA2007] 1327 X 04 31 40.82 +18 17 35.3           ~ 2 0
36 [FGM2003] 34 X 04 31 42.95 +18 03 17.2           ~ 3 0
37 NVSS J043144+181031 Rad 04 31 43.8 +18 10 25           ~ 4 1
38 [FGM2003] 36 X 04 31 44.86 +18 10 05.5           ~ 3 0
39 [FGM2003] S15 X 04 31 49.52 +18 13 03.4           ~ 3 0
40 [GBA2007] 1343 X 04 31 51.43 +18 14 58.7           ~ 2 0
41 USNO-A2.0 1050-01297261 X 04 31 54.13 +18 08 24.6           ~ 3 0
42 [FGM2003] 40 * 04 31 55.20 +18 01 19.0           ~ 3 0
43 [GBA2007] 1353 X 04 31 55.75 +18 07 07.7           ~ 2 0
44 [GBA2007] 1356 X 04 31 56.05 +17 59 09.0           ~ 2 0
45 XEST 22-068 X 04 31 57.53 +18 09 29.4           ~ 3 0
46 V* V710 Tau Or* 04 31 57.79839 +18 21 36.9408           M4 167 0
47 V* V710 Tau A TT* 04 31 57.8028713880 +18 21 34.732161936       13.87   M2/3e 177 0
48 GSC 01269-00641 * 04 31 58.6034101464 +18 18 40.330209132     13.5     K6 11 0
49 [FGM2003] S11 X 04 31 59.34 +18 13 07.7           ~ 3 0
50 [GBA2007] 1368 X 04 31 59.53 +18 01 12.1           ~ 2 0
51 [FGM2003] 46 Rad 04 31 59.6 +18 16 57           ~ 3 0
52 2MASS J04320126+1805011 * 04 32 01.26 +18 05 01.1   22.39 20.91     ~ 6 0
53 [BFR2003] 58 X 04 32 01.30 +18 06 59.6           ~ 3 0
54 [FGM2003] 51 X 04 32 02.17 +18 09 11.9           ~ 1 0
55 [GBA2007] 1380 X 04 32 02.73 +17 58 38.6           ~ 2 0
56 [FGM2003] 53 X 04 32 04.37 +18 09 36.4           ~ 3 0
57 [FGM2003] S9 X 04 32 04.49 +18 08 12.8           ~ 3 0
58 2MASS J04320502+1759591 * 04 32 05.0341945680 +17 59 58.961657688           ~ 5 0
59 [BFR2003] 63 X 04 32 05.63 +18 05 41.5           ~ 3 0
60 [FGM2003] S8 X 04 32 05.97 +18 03 59.2           ~ 3 0
61 [FGM2003] 58 X 04 32 07.48 +18 00 06.9           ~ 1 0
62 L 1551-51 Or* 04 32 09.2839413744 +17 57 22.693472640   13.29       K7e 147 0
63 [FGM2003] 60 X 04 32 10.58 +18 00 36.4           ~ 1 0
64 [FGM2003] 61 X 04 32 10.59 +18 17 02.7           ~ 1 0
65 [GBA2007] 1397 X 04 32 10.89 +18 16 24.0           ~ 2 0
66 [GBA2007] 1398 X 04 32 11.53 +18 12 42.1           ~ 2 0
67 [GBA2007] 1402 X 04 32 12.73 +18 08 08.3           ~ 2 0
68 [GBA2007] 1403 X 04 32 13.72 +18 14 06.7           ~ 2 0
69 [FGM2003] 67 X 04 32 14.38 +18 04 55.4           ~ 1 0
70 V* V827 Tau TT* 04 32 14.5700738928 +18 20 14.771601168   14.00 12.63 12.35   K7Ve 179 0
71 V* V826 Tau TT* 04 32 15.8393134800 +18 01 38.750623752   13.51 12.074   10.312 K7.0 187 0
72 [GBA2007] 1410 X 04 32 15.92 +18 10 44.5           ~ 2 0
73 2MASS J04321606+1812464 TT* 04 32 16.0659498216 +18 12 46.383640812   19.20 17.595     M6.5 97 0
74 [GBA2007] 1413 X 04 32 16.34 +18 10 57.6           ~ 2 0
75 [GBA2007] 1422 X 04 32 19.88 +18 11 00.4           ~ 2 0
76 HD 285844 SB* 04 32 21.5698373328 +18 12 58.406804928   11.14 10.74     G0 17 0
77 [GBA2007] 1431 X 04 32 25.00 +18 07 13.9           ~ 2 0
78 [GBA2007] 1432 X 04 32 25.62 +18 10 26.1           ~ 2 0
79 [GBA2007] 1433 X 04 32 26.22 +18 11 44.2           ~ 2 0
80 GSC 01270-00403 * 04 32 27.9070399128 +18 18 27.475760304   14.4 13.9     ~ 2 0
81 [GBA2007] 1437 X 04 32 28.01 +18 09 02.2           ~ 2 0
82 [GBA2007] 1436 X 04 32 28.10 +18 06 53.8           ~ 2 0
83 RX J0432.4+1814 X 04 32 29.6 +18 14 10           ~ 3 0
84 [GBA2007] 1463 X 04 32 37.27 +18 09 47.7           ~ 2 0

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