2005A&A...429..963O


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET23:11:57

2005A&A...429..963O - Astronomy and Astrophysics, volume 429, 963-975 (2005/1-3)

The X-ray emission from Young Stellar Objects in the ρ Ophiuchi cloud core as seen by XMM-Newton.

OZAWA H., GROSSO N. and MONTMERLE T.

Abstract (from CDS):

We observed the main core F of the ρ Ophiuchi cloud, an active star-forming region located at d ∼140pc, using XMM-Newton with an exposure of 33ks. We detect 87 X-ray sources within the 30' diameter field-of-view of the EPIC imaging detector array. We cross-correlate the positions of XMM-Newton X-ray sources with previous X-ray, infrared (IR), and optical catalogs: 25 previously unknown X-ray sources are found from our observation; 43 X-ray sources are detected by both XMM-Newton and Chandra; 68 XMM-Newton X-ray sources have 2MASS near-IR counterparts. We show that XMM-Newton and Chandra have comparable sensitivity for point source detection when the exposure time is set to ∼30ks for both. We detect X-ray emission from 7 Class I sources, 26 Class II sources, and 17 Class III sources. The X-ray detection rate of Class I sources is very high (64%), which is consistent with previous Chandra observations in this area. We propose that 15 X-ray sources are new class III candidates, which doubles the number of known Class III sources, and helps to complete the census of YSOs in this area. We also detect X-ray emission from two young bona fide brown dwarfs, GY310 and GY141, out of three known in the field of view. GY141 appears brighter by nearly two orders of magnitude than in the Chandra observation. We extract X-ray light curves and spectra from these YSOs, and find some of them showed weak X-ray flares. We observed an X-ray flare from the bona fide brown dwarf GY310. We find as in the previous Chandra observation of this region that Class I sources tend to have higher temperatures and heavier X-ray absorptions than Class II and III sources.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: individual: ρ Ophiuchi cloud - stars: pre-main sequence - stars: low-mass, brown dwarfs - X-rays: stars - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/429/963): table1.dat table2.dat>

Nomenclature: Table 1: ROXN NN (Nos 1-89).

Errata: erratum vol. 438, p. 661 (2005)

Simbad objects: 98

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Number of rows : 98

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 WLY 2-5 * 16 25 40.8043914721 -24 26 17.214627263           ~ 6 0
2 [GY92] 3 Y*O 16 26 21.9083577172 -24 44 39.720788042       17.95 15.62 M6.5 48 0
3 DoAr 25 TT* 16 26 23.6911216715 -24 43 13.886717283       12.65   K5 133 0
4 [GY92] 33 Y*O 16 26 27.53832 -24 41 53.5272           ~ 24 0
5 ROXN 3 X 16 26 35.3 -24 42 39           ~ 2 0
6 [GY92] 93 TT* 16 26 41.2758774571 -24 40 17.853342857       15.41 13.37 M5 55 0
7 VSSG 30 Y*O 16 26 44.19504 -24 34 48.3492           ~ 129 0
8 [GY92] 112 TT* 16 26 44.3013631817 -24 43 14.063146447     17.07 15.15 13.37 M3 32 0
9 BKLT J162644-244711 TT* 16 26 44.4214830718 -24 47 13.727009090       15.72 13.88 M4.5 14 0
10 ROXN 7 X 16 26 45.3 -24 52 08           ~ 2 0
11 [GY92] 122 Y*O 16 26 47.0549335086 -24 44 29.783806566       17.41 15.19 M4.5 19 0
12 [GY92] 125 Y*O 16 26 48.1137708382 -24 42 03.259051715       17.81 15.56 M3.75 13 0
13 [RR90] Oph 2349.8-2601 Y*O 16 26 51.2908889493 -24 32 42.017741452           M8.5 50 0
14 WL 21 Y*O 16 26 57.33000 -24 35 38.8032           M6 41 0
15 EM* SR 24A TT* 16 26 58.5027167088 -24 45 36.698300286       14.15 12.87 K1 92 0
16 Haro 1-7 ** 16 26 58.53 -24 45 35.3           K2:e+M0.5e 96 0
17 WL 22 TT* 16 26 59.16720 -24 34 58.8072           ~ 64 0
18 VSSG 31 Y*O 16 27 04.10688 -24 28 29.9136           ~ 59 1
19 ROXN 13 X 16 27 04.2 -24 46 00           ~ 2 0
20 [GY92] 193 Y*O 16 27 04.5152139620 -24 42 59.673480203       16.69 14.97 K6-M1 29 0
21 [GY92] 194 Y*O 16 27 04.5600221372 -24 42 14.018532542       17.54 15.66 K8-M0 27 0
22 ROXN 16 X 16 27 05.44 -24 41 14.4           ~ 4 0
23 BBRCG 21 Y*O 16 27 05.97624 -24 28 36.3252           M7 37 0
24 [GY92] 204 TT* 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 85 0
25 WL 17 Y*O 16 27 06.77616 -24 38 14.9964           ~ 90 0
26 ROXN 19 X 16 27 07.6 -24 31 52           ~ 1 0
27 WL 10 Y*O 16 27 09.1086301538 -24 34 08.290873154           K9 66 0
28 [GY92] 212 Y*O 16 27 09.3036312037 -24 43 20.047636575           ~ 10 0
29 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 269 1
30 ROXN 23 X 16 27 10.9 -24 51 38           ~ 1 0
31 ROXN 24 X 16 27 11.0 -24 52 08           ~ 1 0
32 WL 19 Y*O 16 27 11.71416 -24 38 32.0604           ~ 68 0
33 WL 11 Y*O 16 27 12.13128 -24 34 49.1412           M2 43 0
34 BKLT J162714-245132 TT* 16 27 14.4886186727 -24 51 33.461634524   18.5 16.44 15.04 13.17 M4.5 35 1
35 BKLT J162715-245137 TT* 16 27 15.1288179688 -24 51 38.809044111   16.9 15.02 13.86 12.38 M2 59 1
36 YLW 10B Y*O 16 27 15.45432 -24 26 39.8004           ~ 48 0
37 WL 20 Y*O 16 27 15.69840 -24 38 43.4364           ~ 78 0
38 NAME WL 20E Y*O 16 27 15.87648 -24 38 43.3896           ~ 71 0
39 2MASS J16271643-2431145 Y*O 16 27 16.438 -24 31 14.55           ~ 15 0
40 WL 5 TT* 16 27 18.17064 -24 28 52.6800           ~ 88 0
41 BBRCG 39 Y*O 16 27 18.38040 -24 39 14.6844           ~ 38 0
42 VSSG 26 Y*O 16 27 18.48720 -24 29 05.9136           ~ 85 0
43 WL 3 Y*O 16 27 19.21584 -24 28 43.8528           K7 62 0
44 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 168 1
45 YLW 13B Y*O 16 27 21.46872 -24 41 43.0692           ~ 88 0
46 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 113 0
47 [GY92] 253 Y*O 16 27 21.83064 -24 43 35.6952           M3 28 0
48 WSB 49 TT* 16 27 22.9689016105 -24 48 07.138242529   16.9   15.06 13.31 M4.25 40 0
49 [GY92] 259 Y*O 16 27 24.63624 -24 29 35.3976           ~ 26 0
50 YLW 16C Y*O 16 27 26.48952 -24 39 23.0760           M1 56 0
51 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 243 1
52 BBRCG 46 Y*O 16 27 27.06864 -24 32 17.5200           ~ 17 0
53 Elia 2-31 TT* 16 27 27.3790999869 -24 31 16.473626072           ~ 66 1
54 YLW 16 IR 16 27 28 -24 39.5           ~ 18 0
55 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 185 0
56 Elia 2-32 Y*O 16 27 28.44576 -24 27 21.0348           K6.5 107 1
57 [WMR2005] 3-7 TT* 16 27 28.7288992637 -24 54 31.788541494       16.02 14.32 M4.75 10 0
58 YLW 16B Y*O 16 27 29.43528 -24 39 16.1892           ~ 103 0
59 BBRCG 53 Y*O 16 27 29.96424 -24 33 36.5688           ~ 20 0
60 Elia 2-33 Y*O 16 27 30.18024 -24 27 43.3656           M2 112 1
61 ROXN 51 X 16 27 30.6 -24 52 10           ~ 3 0
62 BKLT J162730-244726 Y*O 16 27 30.8381007993 -24 47 26.799406990       18.32 16.17 M1-M2 22 0
63 BBRCG 56 Y*O 16 27 31.0584837384 -24 34 03.264280761           ~ 19 0
64 ROXN 54 X 16 27 31.33 -24 31 10.1           ~ 4 0
65 BBRCG 60 Y*O 16 27 32.67576 -24 33 23.9328           ~ 33 0
66 BBRCG 61 Y*O 16 27 32.85048 -24 32 34.8324           ~ 31 0
67 YLW 18 TT* 16 27 33.1158717225 -24 41 15.261194836       17.66 15.65 K5-K6 67 0
68 [GY92] 295 TT* 16 27 35.2624006505 -24 38 33.439591125       16.16 14.08 M4.5 34 0
69 [GY92] 296 Y*O 16 27 35.6623113458 -24 45 32.524940178           ~ 13 0
70 WLY 2-50 Y*O 16 27 38.1251499814 -24 30 43.009912599           ~ 31 0
71 YLW 47 TT* 16 27 38.3220493264 -24 36 58.601739078       17.69 15.52 M0 88 0
72 [GY92] 310 Y*O 16 27 38.6280925403 -24 38 39.230714152         17.40 M8 62 0
73 [GY92] 312 Y*O 16 27 38.94456 -24 40 20.6724           M2.5 40 0
74 2XMM J162738.9-244720 AG? 16 27 39.1 -24 47 22           ~ 3 0
75 ROX 27 TT* 16 27 39.4297106587 -24 39 15.527875310       15.76 14.03 M0+M4 98 0
76 YLW 45 Y*O 16 27 39.82824 -24 43 15.0672           ~ 110 0
77 ROXN 67 X 16 27 43.63 -24 31 26.5           ~ 6 0
78 [GY92] 352 Y*O 16 27 47.09496 -24 45 35.0676           ~ 22 0
79 ROXN 69 X 16 27 49.16 -24 39 06.9           ~ 4 0
80 ROXN 70 X 16 27 50.42 -24 31 49.5           ~ 4 0
81 YLW 52 Y*O 16 27 51.80472 -24 31 45.5304           ~ 64 0
82 [GY92] 377 Y*O 16 27 51.8959543237 -24 46 30.005519039           ~ 14 0
83 WLY 2-55 TT* 16 27 52.0863419872 -24 40 50.713643148     16.28 14.48 12.78 K7.5 79 0
84 [GY92] 398 Y*O 16 27 55.65360 -24 44 50.9028           ~ 9 0
85 ROXN 75 X 16 27 55.8 -24 41 16           ~ 1 0
86 [GY92] 410 Y*O 16 27 57.8269306810 -24 40 01.767684808           K7 27 0
87 BKLT J162800-244819 TT* 16 27 59.9579948843 -24 48 19.320324261   17.3 17.42 15.83 13.44 M4.75 28 0
88 [GY92] 463 TT* 16 28 04.64592 -24 34 56.0964           ~ 16 0
89 [GY92] 465 Y*O 16 28 04.7759297145 -24 37 10.493971224           ~ 11 0
90 ROXN 80 X 16 28 05.0 -24 50 19           ~ 2 0
91 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3138 1
92 ROXN 81 X 16 28 07.0 -24 48 30           ~ 2 0
93 [GY92] 478 Y*O 16 28 08.0987981261 -24 45 12.305641652           ~ 6 0
94 ROXN 83 X 16 28 08.8 -24 46 23           ~ 1 0
95 ROXN 84 X 16 28 11.3 -24 46 15           ~ 1 0
96 ROXN 85 X 16 28 12.7 -24 31 23           ~ 1 0
97 BKLT J162823-244140 Y*O 16 28 23.73984 -24 41 41.2224           ~ 6 0
98 HD 148352 Y*O 16 28 25.1696814272 -24 45 01.022216814   7.89 7.55     F2V 46 0

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2021.03.04-23:11:57

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