2008A&A...491..961L


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.10CEST21:32:57

2008A&A...491..961L - Astronomy and Astrophysics, volume 491, 961-977 (2008/12-1)

New deep XMM-Newton observations to the west of the σ Orionis cluster.

LOPEZ-SANTIAGO J. and CABALLERO J.A.

Abstract (from CDS):

The objective of this study is to determine the general X-ray properties of the young stars in the external regions of the σ Orionis cluster (τ∼3Ma, d∼385pc) and determine constraints on the X-ray emission of brown dwarfs. We carried out a careful analysis of public data obtained from an unexplored region to the west of the centre of the cluster with the three EPIC cameras onboard the XMM-Newton mission. We looked for new X-ray young stars among the 41 identified X-ray sources in the area with maximum likelihood parameters L>15 by cross-correlation with the USNO-B1, DENIS, and 2MASS databases. Based on colour-colour, colour-magnitude, and hardness ratio diagrams, and previous spectroscopic, astrometric, and infrared-flux excess information, we classified the optical/near-infrared counterparts of the X-ray sources into: young stars (15), field stars (4), galaxies (19), and sources of unknown nature (3). Most of the X-ray detections, including those of nine young stars, are new. We derived the X-ray properties (e.g. temperatures, metallicities, column densities) of the twelve young stars with the largest signal-to-noise ratios. The X-ray parameters determined here are in good agreement with those found in the cluster centre, where the stellar density is higher. There is no relation between infrared excess and column density in the X-ray measurements in our data. We detected flaring events in two young stars of the sample. One of them showed a very large (∼30) relative increase in flux. Both stars showed high coronal temperatures during the observation. Finally, we determined upper limits to the flux of the young stars and brown dwarfs not detected by our search algorithm.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: σ Orionis - stars: activity - X-ray: stars

Nomenclature: Table A1: [LC2008] NX NN (Nos 1-41).

Status at CDS:  

Simbad objects: 102

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Number of rows : 102

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1360 PN 03 33 14.6471964691 -25 52 17.981057073   10.95 11.16     sdO 268 0
2 LP 944-20 LM* 03 39 35.2525168530 -35 25 43.628465433     18.69 16.39 13.288 M9.5Ve 263 0
3 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2951 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3408 0
5 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 741 0
6 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1947 1
7 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 856 0
8 [LC2008] NX 1 X 05 36 46.30 -02 35 04.0           ~ 1 0
9 2MASS J05364691-0233282 Y*O 05 36 46.9156799855 -02 33 28.350971976   20.07 18.45 17.02 15.27 ~ 8 0
10 [LC2008] NX 2 X 05 36 50.88 -02 24 52.5           ~ 1 0
11 USNO-B1.0 0872-00105742 * 05 36 56.2971532403 -02 42 07.697452286   20.3   19.4   ~ 1 0
12 [BZR99] S Ori 33 * 05 36 58.0790338638 -02 35 19.451241597         17.08 ~ 11 0
13 2MASS J05370030-0228265 Y*O 05 37 00.3024795456 -02 28 26.573357733   19.18 17.74 16.45 14.88 ~ 4 0
14 Mayrit 1738301 * 05 37 05.1722164345 -02 21 09.394841956         17.79 ~ 4 0
15 TYC 4770-1261-1 * 05 37 10.4910557007 -02 30 07.071066091   12.08 11.42   11.307 ~ 5 0
16 2MASS J05371161-0232087 Y*O 05 37 11.6194764264 -02 32 08.796390100   13.78 12.71 12.59 11.40 K2.0 13 0
17 2MASS J05371167-0231566 Y*O 05 37 11.6781367074 -02 31 56.655414944   19.88 18.30 16.94 15.23 ~ 4 0
18 UCAC2 30799897 * 05 37 13.9234263627 -02 43 51.805150383           ~ 1 0
19 2MASS J05371515-0242015 Y*O 05 37 15.1564373479 -02 42 01.648395822   19.64 18.12 16.85 15.23 M4e 8 0
20 2MASS J05371537-0230534 Y*? 05 37 15.3715689434 -02 30 53.421181430   13.71 12.96   12.04 ~ 7 0
21 [LC2008] NX 8 X 05 37 19.63 -02 25 41.7           ~ 1 0
22 UCAC2 30799911 * 05 37 21.0737574522 -02 37 19.267914029           ~ 1 0
23 [LC2008] NX 11 * 05 37 22.7834366324 -02 32 42.966584949           ~ 2 0
24 2MASS J05372304-0222431 * 05 37 23.0559783384 -02 22 43.187546651           ~ 1 0
25 2MASS J05372306-0232465 Y*O 05 37 23.0641016604 -02 32 46.579040510   19.97 18.42 17.18 15.65 M3.0 7 0
26 DENIS J053724.1-024159 IR 05 37 24.110 -02 41 59.87   18.9     18.04 ~ 1 0
27 [BZR99] S Ori 66 BD* 05 37 24.71064 -02 31 52.3308         23.23 L3.5:e 12 0
28 [BZR99] S Ori 55 LM* 05 37 25.88208 -02 34 32.0736         21.07 M9Ve 21 0
29 2E 1448 G 05 37 27.9281167183 -02 40 03.250362595         16.186 ~ 3 0
30 2MASS J05372806-0236065 Y*O 05 37 28.0704355827 -02 36 06.542884647     17.57 16.46   M2.0 5 0
31 [LC2008] NX 15 X 05 37 28.29 -02 32 45.8           ~ 1 0
32 2MASS J05372831-0224182 Y*O 05 37 28.3206860109 -02 24 18.274998056   19.31 18.11 16.75 15.34 M3.0 5 0
33 Haro 5-5 Y*O 05 37 30.9498956537 -02 23 42.804953068   18.33 17.11 15.91 14.51 M2.0 13 0
34 2MASS J05373153-0224269 Y*O 05 37 31.536 -02 24 26.96   17.32 15.85 14.72 13.45 M3 9 0
35 USNO-B1.0 0875-00102588 * 05 37 31.6827245762 -02 25 10.784868803   19.9   19.5   ~ 1 0
36 HD 294275 Y*O 05 37 31.8728312238 -02 45 18.465113643   9.51 9.42   9.360 A0 17 0
37 USNO-B1.0 0873-00105537 * 05 37 32.9865926373 -02 37 44.358190107   20.7   19.5   ~ 1 0
38 2MASS J05373514-0226577 Y*O 05 37 35.1462656215 -02 26 57.732530941     18.93 17.57 15.33 M5.5 5 0
39 2MASS J05373666-0234003 Y*O 05 37 36.6687358091 -02 34 00.304974881   18.61 17.03 15.85 14.46 M3.0 8 0
40 2MASS J05373784-0245442 Y*O 05 37 37.8477473334 -02 45 44.267944120   17.74 16.25 15.23 14.01 M2.0 7 0
41 HD 37333 Y*O 05 37 40.4746928699 -02 26 36.841198403   8.59 8.51   8.420 A1Va(Si) 38 0
42 2MASS J05374160-0229380 * 05 37 41.6087457349 -02 29 38.027404078         14.85 ~ 1 0
43 2MASS J05374178-0229081 Y*O 05 37 41.7890797356 -02 29 08.189579350   11.20 10.90     A9.0 6 0
44 UCAC2 30953393 * 05 37 43.1075449832 -02 25 13.109160826     14.41 13.79   ~ 3 0
45 [LC2008] NX 25 X 05 37 43.38 -02 27 53.6           ~ 1 0
46 2MASS J05374491-0229573 Y*O 05 37 44.9162940937 -02 29 57.309866006   11.50 10.95   10.747 ~ 11 1
47 2MASS J05374557-0229585 Y*? 05 37 45.5732659584 -02 29 58.530698301         11.762 ~ 8 1
48 [LC2008] NX 26 X 05 37 47.56 -02 29 10.2           ~ 1 0
49 [BZR99] S Ori 23 Y*O 05 37 51.1104866700 -02 26 07.495213781   20.6   19.4 16.88 M6.5 14 0
50 2MASS J05375161-0235257 Y*O 05 37 51.6119417355 -02 35 25.695389711 18.636   15.64 14.56 13.34 M2.0 16 0
51 Mayrit 790270 Y*O 05 37 52.0720309882 -02 36 04.659931580   22.41 20.91 19.20 17.34 M4.5 14 0
52 [W96] 4771-921 Y*O 05 37 53.0358881217 -02 33 34.399391646 13.379 12.35 11.64   10.70 G2.5 12 0
53 [LC2008] NX 29 X 05 37 53.27 -02 26 54.7           ~ 1 0
54 [W96] rJ053754-0239 Y*O 05 37 54.4032171635 -02 39 29.792561856   11.80 10.91   10.274 G5.0 15 0
55 2MASS J05375445-0243378 Y*O 05 37 54.4537636216 -02 43 37.825180113   13.87 12.50   11.30 G7.0 8 0
56 2MASS J05375486-0241092 Y*O 05 37 54.8667166688 -02 41 09.234610591   19.68 18.34 17.14 15.43 M5.0 13 0
57 [BZR99] S Ori 35 Y*O 05 37 55.5938033361 -02 33 05.329849784 20.472 23.63   19.40 17.55 M4.5 14 0
58 [LC2008] NX 31 X 05 37 55.74 -02 33 43.0           ~ 1 0
59 2MASS J05375630-0245130 G 05 37 56.3074678754 -02 45 13.203129202         16.734 ~ 7 0
60 [BZR99] S Ori 12 Y*O 05 37 57.4584984711 -02 38 44.461380271   20.61 19.81 18.15 16.42 M4.5/6V 25 0
61 USNO-B1.0 0875-00102882 * 05 37 58.3784342157 -02 25 13.368131655   19.8   19.3   ~ 1 0
62 2MASS J05375840-0241262 Y*O 05 37 58.4019434737 -02 41 26.231984391   21.06 18.63 17.26 15.31 M5.5 15 0
63 2MASS J05380055-0245097 Y*O 05 38 00.5578886577 -02 45 09.801780591   19.09 17.61 16.31 14.54 M5.0 12 0
64 2MASS J05380097-0226079 Y*O 05 38 00.9734866441 -02 26 07.933966500   18.08 16.71 15.57 14.27 M2.5 12 0
65 Haro 5-7 Y*O 05 38 01.0752774425 -02 45 38.012747935   18.61 17.38 15.97 14.24 M4.5 20 0
66 2MASS J05380167-0225527 Y*O 05 38 01.6745949103 -02 25 52.785231427   18.71 17.21 16.01 14.54 ~ 11 0
67 [LC2008] NX 35 X 05 38 03.68 -02 27 30.0           ~ 1 0
68 2MASS J05380552-0235571 Y*O 05 38 05.5205926485 -02 35 57.096428936   26.46 21.41 19.60 17.70 M4.5 13 0
69 2MASS J05380649-0228494 Y*O 05 38 06.4952505522 -02 28 49.456255371 12.715 11.76 11.38   10.741 F3.5 12 0
70 Kiso A-0904 67 Y*O 05 38 06.7457000396 -02 30 22.747725674 17.703 16.46 15.08 14.08 13.14 M1 17 0
71 2MASS J05380784-0231314 Y*O 05 38 07.8449779201 -02 31 31.351288003 15.277   12.72   11.41 K3.0 13 0
72 Kiso A-0976 316 Y*O 05 38 08.2659827813 -02 35 56.278344564 18.050   16.19 15.08 13.76 M2.5 18 0
73 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 46 0
74 2MASS J05381319-0226088 Y*O 05 38 13.1972684896 -02 26 08.655719751   18.41 16.92 15.67 14.10 M4.5 18 0
75 [LC2008] NX 39 X 05 38 13.60 -02 35 09.7           ~ 1 0
76 [LC2008] NX 40 X 05 38 14.02 -02 36 48.3           ~ 1 0
77 2MASS J05381552-0242051 IR 05 38 15.5238734130 -02 42 05.120527484   18.0 18.5     ~ 2 0
78 2MASS J05381610-0238049 Y*O 05 38 16.1011615792 -02 38 04.983070440 20.46 19.65 18.09 16.77 15.09 M3.5 16 0
79 2MASS J05381741-0240242 BD* 05 38 17.4137148747 -02 40 24.281223771   23.24   19.21 17.09 M5/7V 24 0
80 2MASS J05381778-0240500 Y*O 05 38 17.783 -02 40 50.07 18.94 19.81 18.14 16.76 14.94 M5.0 16 0
81 2MASS J05381834-0235385 Y*O 05 38 18.3427958012 -02 35 38.521069766 20.863   22.91 20.49 18.08 ~ 15 0
82 [W96] rJ053820-0237 LM* 05 38 20.2123829592 -02 38 01.664475774   19.07 17.47 16.08 14.27 M4-5e 19 0
83 [W96] rJ053820-0234 TT* 05 38 20.5032054815 -02 34 08.977031521   20.99 19.39 17.68 15.74 M4e 23 0
84 Mayrit 379292 Y*O 05 38 21.3860880281 -02 33 36.294537911     20.78 19.47 17.45 ~ 16 0
85 2MASS J05382307-0236493 Y*O 05 38 23.077 -02 36 49.37 18.99 19.61 18.45 17.01 15.64 ~ 15 0
86 [BZR99] S Ori 18 Y*O 05 38 25.6849274690 -02 31 21.697219141     19.99 18.68 16.59 M3.5 16 0
87 Kiso A-0976 329 TT* 05 38 27.5111635459 -02 35 04.229527586 18.90 18.59 17.17 15.92 14.37 M3.5e 23 0
88 2MASS J05383888-0228016 Y*O 05 38 38.8911596595 -02 28 01.731339488 20.95 21.83   18.77 16.99 M5Ve 24 0
89 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 481 0
90 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 736 0
91 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 395 0
92 [BZR99] S Ori 25 Or* 05 39 08.9501208834 -02 39 57.988185282     21.09 19.34 17.02 M6.5V 23 0
93 [BZR99] S Ori 3 LM* 05 39 20.9753878881 -02 30 33.530119637   20.66 19.25 17.58 15.57 ~ 19 0
94 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 439 0
95 GD 257 WD* 05 50 37.5195814635 +00 05 52.619647637   14.80 15.10 15.1   DA1.1 65 0
96 MSB 32 C* 07 57 43.2703606377 -00 41 06.238121223           C4,2e 26 1
97 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 545 1
98 BD+16 2708B SB* 14 54 29.4185719182 +16 06 08.616294953           M8.5 130 0
99 [FPS2006] NX 12 X ~ ~           ~ 1 0
100 [FPS2006] NX 14 X ~ ~           ~ 2 0
101 NAME Ori Belt reg ~ ~           ~ 65 0
102 NAME Castor Moving Group As* ~ ~           ~ 114 1

    Equat.    Gal    SGal    Ecl

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2020.04.10-21:32:57

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