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


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST13:59:50

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: 122

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Number of rows : 122

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 780 1
2 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 818 0
3 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1248 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           ~ 2050 1
6 [TUK93] 3 Y*O 05 35 18.32712 -05 00 32.9400           ~ 58 2
7 HOPS 91 Y*O 05 35 18.98 -05 00 51.6           ~ 30 0
8 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 234 1
9 OMC 2 MoC 05 35 27 -05 10.1           ~ 404 1
10 HH 2 HH 05 36.4 -06 47           ~ 335 1
11 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1622 0
12 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
13 2MASS J18291080+0112000 X 18 29 10.8137471954 +01 11 59.869806193           ~ 1 0
14 2MASS J18292272+0110329 Y*O 18 29 22.7210572376 +01 10 32.914622310   18.0   15.1   K7.5 8 0
15 BD+01 3686 * 18 29 27.5980007743 +01 12 58.424165663   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 cor 18 29 31.968 +01 18 42.17           ~ 10 1
22 ESO-HA 279a cor 18 29 31.976 +01 18 42.59           K6.5 29 1
23 [GFM2007] 10 X 18 29 32.9 +01 22 40           ~ 1 0
24 [SVS76] Ser 14 Y*O 18 29 33.0699960697 +01 17 16.469185194   17.9   15.0   G2.5 14 0
25 [GFM2007] 12 X 18 29 34.2 +01 17 03           ~ 1 0
26 [P2003] J182935.1+012338 X 18 29 35.14 +01 23 39.0           ~ 3 0
27 [GFM2007] 14 X 18 29 35.5 +01 16 54           ~ 1 0
28 [GFM2007] 15 X 18 29 35.6 +01 23 11           ~ 1 0
29 [GFM2007] 16 X 18 29 38.1 +01 10 23           ~ 1 0
30 [GFM2007] 17 X 18 29 38.5 +01 14 50           ~ 1 0
31 [P2003] J182939.7+011754 X 18 29 39.7 +01 17 54           ~ 2 0
32 2MASS J18293987+0117559 Y*O 18 29 39.8730587848 +01 17 55.890063693           M1.5 12 0
33 [GFM2007] 19 X 18 29 41.1 +01 13 43           ~ 1 0
34 [GFM2007] 20 X 18 29 42.1 +01 13 12           ~ 1 0
35 2MASS J18294234+0112019 Y*O 18 29 42.349 +01 12 01.97           M7.0 5 0
36 [GFM2007] 22 X 18 29 42.7 +01 14 01           ~ 1 0
37 2MASS J18294453+0113113 Y*O 18 29 44.538 +01 13 11.35           M4.5 13 0
38 SSTc2d J182944.6+011006 X 18 29 44.63 +01 10 05.6           ~ 1 0
39 [GFM2007] 25 X 18 29 45.1 +01 24 37           ~ 1 0
40 [GFM2007] 26 X 18 29 46.3 +01 07 47           ~ 1 0
41 2MASS J18294723+0122346 Y*O 18 29 47.2327165702 +01 22 34.631996337   19.8   16.0   M2.5 7 0
42 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 112 1
43 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 967 2
44 2MASS J18294960+0117058 Y*O 18 29 49.602 +01 17 05.83           ~ 28 0
45 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 241 2
46 2MASS J18295053+0108580 Y*O 18 29 50.5399141945 +01 08 57.953365294           M4.5 5 0
47 2MASS J18295118+0113196 Y*O 18 29 51.186 +01 13 19.62           ~ 15 0
48 V* V371 Ser Or* 18 29 51.21240 +01 16 39.4860           ~ 96 1
49 GCNM 37 * 18 29 51.5 +01 13 21           ~ 2 0
50 NAME Serpens SMM 10 IR Y*O 18 29 52.20 +01 15 47.6           ~ 43 1
51 [GFM2007] 32 Y*O 18 29 52.20 +01 15 59.0           ~ 7 0
52 [ACA2003] Ser B 1 Y*O 18 29 52.85 +01 14 56.1           ~ 17 1
53 2MASS J18295360+0117017 Y*O 18 29 53.6097296564 +01 17 01.723303599   19.7   16.6   M2.0 19 0
54 2MASS J18295452+0114469 Y*O 18 29 54.5186985049 +01 14 46.980796667           M8.0 10 0
55 2MASS J18295536+0110340 Y*O 18 29 55.3660225875 +01 10 33.904046562           M5.0 8 0
56 2MASS J18295571+0114315 Y*O 18 29 55.711 +01 14 31.50           ~ 38 0
57 NAME Ser Nebula RNe 18 29 56 +01 14.8           ~ 29 1
58 2MASS J18295618+0110574 Y*O 18 29 56.1834736704 +01 10 57.458848349           K5.0 8 0
59 2MASS J18295635+0112180 Y*O 18 29 56.3573614586 +01 12 18.127372547           M8.5 11 0
60 2MASS J18295655+0112596 Y*O 18 29 56.553 +01 12 59.65           ~ 22 0
61 2MASS J18295667+0112393 Y*O 18 29 56.674 +01 12 39.32           ~ 19 0
62 [GFM2007] 41 X 18 29 56.7 +01 19 54           ~ 1 0
63 HBC 672 Em* 18 29 56.8828626544 +01 14 46.339137067   17.6       K8.0 100 0
64 [B96] Serpens 5 Rad 18 29 56.96 +01 12 48.0           ~ 1 0
65 2MASS J18295696+0112478 Y*O 18 29 56.967 +01 12 47.83           M3.0 25 0
66 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 126 0
67 2MASS J18295741+0114503 Y*O 18 29 57.4123268031 +01 14 50.191039065           M2.0 16 0
68 2MASS J18295760+0113004 Y*O 18 29 57.602 +01 13 00.42           ~ 35 3
69 HD 170545 ** 18 29 57.66 +01 10 53.6           B9V 17 0
70 HD 170545A Y*O 18 29 57.6614831670 +01 10 53.606581241   8.617 8.470 8.96   A1-A3Ve 16 0
71 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 137 2
72 [GFM2007] 49 X 18 29 57.8 +01 14 07           ~ 1 0
73 [GFM2007] 51 X 18 29 57.8 +01 14 08           ~ 1 0
74 2MASS J18295781+0115318 Y*O 18 29 57.816 +01 15 31.86           K2.0 21 0
75 [B96] Serpens 8 Rad 18 29 57.83 +01 12 46.7           ~ 1 0
76 2MASS J18295784+0112379 Y*O 18 29 57.849 +01 12 37.90           ~ 23 0
77 2MASS J18295785+0112514 Y*O 18 29 57.858 +01 12 51.40           ~ 59 3
78 [EC92] 95 Y*O 18 29 57.893 +01 12 46.25           K1.0 72 3
79 2MASS J18295820+0115216 Y*O 18 29 58.2037104611 +01 15 21.603460135           K7.0 38 0
80 2MASS J18295844+0112502 Y*O 18 29 58.446 +01 12 50.21           ~ 11 0
81 2MASS J18295907+0111137 Y*O 18 29 59.075 +01 11 13.72           ~ 2 0
82 2MASS J18295913+0111200 Y*O 18 29 59.1310730425 +01 11 20.076739566           M5.0 12 0
83 CK 8 TT* 18 29 59.2453367145 +01 14 07.606895690   19.7   16.9   K7.5 28 0
84 SSTc2d J182959.5+011159 cor 18 29 59.573 +01 11 58.39           ~ 23 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 NAME SERPENS SMM 3 smm 18 29 59.7 +01 14 00           ~ 86 1
88 2MASS J18300020+0114035 Y*O 18 30 00.206 +01 14 03.56           ~ 14 0
89 SSTc2d J183000.3+010944 Y*O 18 30 00.30 +01 09 44.7           ~ 11 0
90 NAME Serpens SMM 11 smm 18 30 00.3 +01 11 42           ~ 23 0
91 JCMTSE J183000.2+011251 Y*O 18 30 00.4 +01 12 50           ~ 51 0
92 [GFM2007] 64 X 18 30 00.5 +01 23 45           ~ 1 0
93 2MASS J18300065+0113402 Y*O 18 30 00.6479615718 +01 13 40.113500422           M0.5 25 0
94 2MASS J18300111+0113242 Y*O 18 30 01.110 +01 13 24.24           ~ 13 0
95 2MASS J18300124+0115036 Y*O 18 30 01.245 +01 15 03.61           ~ 10 0
96 [GFM2007] 68 X 18 30 01.4 +01 18 08           ~ 1 0
97 GCNM 147 * 18 30 01.5 +01 15 05           ~ 2 0
98 2MASS J18300153+0115150 Y*O 18 30 01.5363244744 +01 15 15.048624036           ~ 16 0
99 [CED93] 8 smm 18 30 01.8 +01 15 07           ~ 17 0
100 2MASS J18300341+0116191 Y*O 18 30 03.4139495304 +01 16 19.088787966   18.9   15.0   M0.0 41 0
101 [EC92] 138 * 18 30 03.6868552893 +01 16 14.273212182           ~ 4 0
102 [GFM2007] 70 X 18 30 04.62 +01 22 34.1           ~ 6 0
103 2MASS J18300491+0114393 Y*O 18 30 04.9156118137 +01 14 39.332158291           M5.0 13 0
104 2MASS J18300549+0114248 Y*O 18 30 05.4965182605 +01 14 24.724439763           M5.0 5 0
105 2MASS J18300610+0106170 Y*O 18 30 06.1029526156 +01 06 16.935486714   19.0   16.5   M1.0 12 0
106 [P2003] J183006.7+011216 X 18 30 06.78 +01 12 10.0           ~ 3 0
107 2MASS J18300770+0112043 Y*O 18 30 07.708 +01 12 04.32           M2.5 15 0
108 [GFM2007] 76 X 18 30 08.2 +01 10 55           ~ 1 0
109 [GFM2007] 77 X 18 30 09.9 +01 17 07           ~ 1 0
110 [GFM2007] 78 X 18 30 10.4 +01 10 06           ~ 1 0
111 [GFM2007] 80 X 18 30 11.1 +01 17 52           ~ 1 0
112 2MASS J18301111+0112379 Y*O 18 30 11.1152539445 +01 12 38.034644989           M4.0 10 0
113 [GFM2007] 81 X 18 30 12.58 +01 12 26.8           ~ 2 0
114 [GFM2007] 82 X 18 30 16.2 +01 17 54           ~ 1 0
115 2MASS J18301818+0114167 Y*O 18 30 18.1871932645 +01 14 16.725773201           M0.0 14 0
116 2MASS J18302240+0120439 Y*O 18 30 22.4032466588 +01 20 43.872279492           M1.0 11 0
117 2MASS J18302312+0120097 Y*O 18 30 23.1272366449 +01 20 09.613885462   19.5   16.8   M3.5 9 0
118 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 91 2
119 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 83 1
120 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 102 1
121 [BGE2002] BIMA 2 Y*O 21 40 42.36 +58 16 09.7           ~ 116 0
122 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 182 1

    Equat.    Gal    SGal    Ecl

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2021.04.16-13:59:50

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