2007A&A...463..275G

Query : 2007A&A...463..275G

2007A&A...463..275G - Astronomy and Astrophysics, volume 463, 275-288 (2007/2-3)

The onset of X-ray emission in young stellar objects. A Chandra observation of the Serpens star-forming region.

GIARDINO G., FAVATA F., MICELA G., SCIORTINO S. and WINSTON E.

Abstract (from CDS):

To study the properties of X-ray emission from young stellar objects (YSOs) through their evolution from Class I to Class III and determine whether Class 0 protostars emit X-rays. A deep Chandra X-ray observation of the Serpens star-forming region was obtained. The Serpens Cloud Core is ideally suited for this type of investigation, being populated by a dense and extremely young cluster whose members are found in all evolutionary stages, including six well-studied Class 0 sources. None of the six Class 0 protostars is detected in our observations, excluding the presence of sources with typical X-ray luminosities >0.4x1030erg/s (for column densities of the order of 4x1023cm–2, or AV∼200). A total of 85 X-ray sources are detected and the light curves and spectra of 35 YSOs are derived. There is a clear trend of decreasing absorbing column densities as one moves from Class I to Class III sources, and some evidence of decreasing plasma temperatures, too. We observe a strong, long-duration, flare from a Class II low-mass star, for which we derive a flaring loop length of the order of 20 stellar radii. We interpret the flaring event as originating from a magnetic flux tube connecting the star to its circumstellar disk. The presence of such a disk is supported by the detection, in the spectrum of this star, of 6.4keV Fe fluorescent emission.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - ISM: individual objects: Serpens cloud - stars: pre-main sequence - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/463/275): table5.dat table6.dat>

Nomenclature: Table 5: [GFM2007] NN (Nos 1-85).

Simbad objects: 121

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Number of rows : 121
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 805 1
2 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 863 0
3 V* HL Tau Or* 04 31 38.5107609312 +18 13 57.859747968   15.89 14.49 14.39   K5 1424 0
4 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2331 0
6 [TUK93] 3 Y*O 05 35 18.32712 -05 00 32.9400           ~ 74 2
7 HOPS 91 Y*O 05 35 18.98 -05 00 51.6           ~ 41 0
8 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 273 1
9 OMC 2 MoC 05 35 27 -05 10.1           ~ 450 1
10 HH 2 HH 05 36.4 -06 47           ~ 341 1
11 NGC 2264 OpC 06 40 52.1 +09 52 37           ~ 1793 0
12 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3630 1
13 2MASS J18291080+0112000 * 18 29 10.8146274552 +01 11 59.876495772           ~ 1 0
14 ATO J277.3446+01.1757 Y*O 18 29 22.7208806640 +01 10 32.911664592   18.0   15.1   K7.5 10 0
15 BD+01 3686 * 18 29 27.5966928024 +01 12 58.463466372   11.57 11.05     F8 7 0
16 [GFM2007] 4 X 18 29 28.2 +01 15 48           ~ 1 0
17 [GFM2007] 5 X 18 29 29.8 +01 21 19           ~ 1 0
18 [GFM2007] 6 Y*O 18 29 29.80 +01 21 57.4           ~ 4 0
19 [GFM2007] 7 X 18 29 31.4 +01 19 56           ~ 1 0
20 [GFM2007] 8 X 18 29 31.8 +01 13 39           ~ 1 0
21 IRAS 18269+0116 Y*O 18 29 31.9758302760 +01 18 42.616775520           K6.5 39 0
22 [GFM2007] 10 X 18 29 32.9 +01 22 40           ~ 1 0
23 [SVS76] Ser 14 Y*O 18 29 33.0704323752 +01 17 16.480512312   17.9   15.0   G2.5 15 0
24 [GFM2007] 12 X 18 29 34.2 +01 17 03           ~ 1 0
25 [P2003] J182935.1+012338 X 18 29 35.14 +01 23 39.0           ~ 3 0
26 [GFM2007] 14 X 18 29 35.5 +01 16 54           ~ 1 0
27 [GFM2007] 15 X 18 29 35.6 +01 23 11           ~ 1 0
28 [GFM2007] 16 X 18 29 38.1 +01 10 23           ~ 1 0
29 [GFM2007] 17 X 18 29 38.5 +01 14 50           ~ 1 0
30 [P2003] J182939.7+011754 X 18 29 39.7 +01 17 54           ~ 2 0
31 2MASS J18293987+0117559 Y*O 18 29 39.8713053528 +01 17 56.025241152           M1.5 13 0
32 [GFM2007] 19 X 18 29 41.1 +01 13 43           ~ 1 0
33 [GFM2007] 20 X 18 29 42.1 +01 13 12           ~ 1 0
34 2MASS J18294234+0112019 Y*O 18 29 42.349 +01 12 01.97           M7.0 5 0
35 [GFM2007] 22 X 18 29 42.7 +01 14 01           ~ 1 0
36 2MASS J18294453+0113113 Y*O 18 29 44.53752 +01 13 11.3484           M4.5 14 0
37 SSTc2d J182944.6+011006 X 18 29 44.63 +01 10 05.6           ~ 1 0
38 [GFM2007] 25 X 18 29 45.1 +01 24 37           ~ 1 0
39 [GFM2007] 26 X 18 29 46.3 +01 07 47           ~ 1 0
40 2MASS J18294723+0122346 Y*O 18 29 47.2327549368 +01 22 34.636921428   19.8   16.0   M2.5 8 0
41 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 137 1
42 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2
43 2MASS J18294960+0117058 Y*O 18 29 49.602 +01 17 05.83           ~ 34 0
44 GCNM 23 Y*O 18 29 49.63 +01 15 21.9           ~ 273 2
45 2MASS J18295053+0108580 Y*O 18 29 50.5399993584 +01 08 57.969237804           M4.5 5 0
46 2MASS J18295118+0113196 Y*O 18 29 51.186 +01 13 19.62           ~ 16 0
47 V* V371 Ser Or* 18 29 51.21240 +01 16 39.4860           ~ 119 1
48 GCNM 37 * 18 29 51.5 +01 13 21           ~ 2 0
49 GBS-VLA J182952.22+011547.4 Y*O 18 29 52.20 +01 15 47.6           ~ 47 1
50 [GFM2007] 32 Y*O 18 29 52.20 +01 15 59.0           ~ 9 0
51 [ACA2003] Ser B 1 Y*O 18 29 52.85 +01 14 56.1           ~ 18 1
52 2MASS J18295360+0117017 Y*O 18 29 53.6099956536 +01 17 01.730202216   19.7   16.6   M2.0 21 0
53 2MASS J18295452+0114469 Y*O 18 29 54.5185217904 +01 14 46.974838092           M8.0 10 0
54 2MASS J18295536+0110340 Y*O 18 29 55.3611830520 +01 10 34.044079044           M5.0 8 0
55 2MASS J18295571+0114315 Y*O 18 29 55.711 +01 14 31.50           ~ 39 0
56 NAME Ser Nebula RNe 18 29 56 +01 14.8           ~ 29 1
57 2MASS J18295618+0110574 Y*O 18 29 56.1832123056 +01 10 57.457509132           K5.0 9 0
58 2MASS J18295635+0112180 Y*O 18 29 56.3551125576 +01 12 18.078171192           M8.5 11 0
59 2MASS J18295655+0112596 Y*O 18 29 56.553 +01 12 59.65           ~ 23 0
60 2MASS J18295667+0112393 Y*O 18 29 56.674 +01 12 39.32           ~ 20 0
61 [GFM2007] 41 X 18 29 56.7 +01 19 54           ~ 1 0
62 HBC 672 Em* 18 29 56.8848005064 +01 14 46.304766672   17.6       K8.0 102 0
63 [B96] Serpens 5 Rad 18 29 56.96 +01 12 48.0           ~ 1 0
64 2MASS J18295696+0112478 Y*O 18 29 56.967 +01 12 47.83           M3.0 26 0
65 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 137 0
66 2MASS J18295741+0114503 Y*O 18 29 57.4127920080 +01 14 50.197813116           M2.0 17 0
67 2MASS J18295760+0113004 Y*O 18 29 57.602 +01 13 00.42           ~ 36 3
68 HD 170545 ** 18 29 57.66 +01 10 53.6           B9V 17 0
69 HD 170545A Y*O 18 29 57.6615650088 +01 10 53.561414136   8.617 8.470 8.96   A1-A3Ve 17 0
70 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 139 2
71 [GFM2007] 49 X 18 29 57.8 +01 14 07           ~ 1 0
72 [GFM2007] 51 X 18 29 57.8 +01 14 08           ~ 1 0
73 2MASS J18295781+0115318 Y*O 18 29 57.816 +01 15 31.86           K2.0 22 0
74 [B96] Serpens 8 Rad 18 29 57.83 +01 12 46.7           ~ 1 0
75 2MASS J18295784+0112379 Y*O 18 29 57.849 +01 12 37.90           ~ 23 0
76 2MASS J18295785+0112514 Y*O 18 29 57.858 +01 12 51.40           ~ 60 3
77 [EC92] 95 Y*O 18 29 57.893 +01 12 46.25           K1.0 73 3
78 2MASS J18295820+0115216 Y*O 18 29 58.2037073472 +01 15 21.610474308           K7.0 40 0
79 2MASS J18295844+0112502 Y*O 18 29 58.446 +01 12 50.21           ~ 11 0
80 2MASS J18295907+0111137 Y*O 18 29 59.075 +01 11 13.72           ~ 2 0
81 2MASS J18295913+0111200 Y*O 18 29 59.1300417000 +01 11 20.111697168           M5.0 13 0
82 CK 8 TT* 18 29 59.2453548960 +01 14 07.611180936   19.7   16.9   K7.5 31 0
83 NAME SERPENS SMM 3 Y*O 18 29 59.28 +01 14 01.7           ~ 101 1
84 SSTc2d J182959.5+011159 cor 18 29 59.573 +01 11 58.39           ~ 25 0
85 [B96] Serpens 10 Rad 18 29 59.60 +01 14 12.2           ~ 1 0
86 [GFM2007] 61 Y*O 18 29 59.61 +01 14 12.3           ~ 5 0
87 2MASS J18300020+0114035 Y*O 18 30 00.206 +01 14 03.56           ~ 14 0
88 SSTc2d J183000.3+010944 Y*O 18 30 00.30 +01 09 44.7           ~ 12 0
89 NAME Serpens SMM 11 smm 18 30 00.3 +01 11 42           ~ 24 0
90 JCMTSE J183000.2+011251 Y*O 18 30 00.4 +01 12 50           ~ 53 0
91 [GFM2007] 64 X 18 30 00.5 +01 23 45           ~ 1 0
92 2MASS J18300065+0113402 Y*O 18 30 00.6502197504 +01 13 40.174218912           M0.5 27 0
93 2MASS J18300111+0113242 Y*O 18 30 01.110 +01 13 24.24           ~ 14 0
94 2MASS J18300124+0115036 Y*O 18 30 01.245 +01 15 03.61           ~ 10 0
95 [GFM2007] 68 X 18 30 01.4 +01 18 08           ~ 1 0
96 GCNM 147 * 18 30 01.5 +01 15 05           ~ 2 0
97 2MASS J18300153+0115150 Y*O 18 30 01.5335499336 +01 15 14.987965320           ~ 16 0
98 [CED93] 8 smm 18 30 01.8 +01 15 07           ~ 18 0
99 2MASS J18300341+0116191 Y*O 18 30 03.4139489400 +01 16 19.094575296   18.9   15.0   M0.0 44 0
100 [EC92] 138 * 18 30 03.6864560496 +01 16 14.271874212           ~ 4 0
101 [GFM2007] 70 X 18 30 04.62 +01 22 34.1           ~ 6 0
102 2MASS J18300491+0114393 Y*O 18 30 04.9153250976 +01 14 39.341792832           M5.0 15 0
103 2MASS J18300549+0114248 Y*O 18 30 05.4976746960 +01 14 24.747091260           M5.0 5 0
104 2MASS J18300610+0106170 Y*O 18 30 06.1030207776 +01 06 16.939699380   19.0   16.5   M1.0 14 0
105 [P2003] J183006.7+011216 X 18 30 06.78 +01 12 10.0           ~ 3 0
106 2MASS J18300770+0112043 Y*O 18 30 07.708 +01 12 04.32           M2.5 16 0
107 [GFM2007] 76 X 18 30 08.2 +01 10 55           ~ 1 0
108 [GFM2007] 77 X 18 30 09.9 +01 17 07           ~ 1 0
109 [GFM2007] 78 X 18 30 10.4 +01 10 06           ~ 1 0
110 [GFM2007] 80 X 18 30 11.1 +01 17 52           ~ 1 0
111 2MASS J18301111+0112379 Y*O 18 30 11.1150601056 +01 12 38.044185408           M4.0 14 0
112 [GFM2007] 81 X 18 30 12.58 +01 12 26.8           ~ 2 0
113 [GFM2007] 82 X 18 30 16.2 +01 17 54           ~ 1 0
114 2MASS J18301818+0114167 Y*O 18 30 18.1870131528 +01 14 16.733300676           M0.0 16 0
115 2MASS J18302240+0120439 Y*O 18 30 22.4033066856 +01 20 43.873119204           M1.0 13 0
116 2MASS J18302312+0120097 Y*O 18 30 23.1282765384 +01 20 09.614934276   19.5   16.8   M3.5 10 0
117 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 97 2
118 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 95 1
119 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 109 1
120 [BGE2002] BIMA 2 Y*O 21 40 42.36 +58 16 09.7           ~ 119 0
121 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 189 1

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