1997A&A...325.1001S

Query : 1997A&A...325.1001S

1997A&A...325.1001S - Astronomy and Astrophysics, volume 325, 1001-1012 (1997/9-3)

The X-ray view of the central part of IC 1396.

SCHULZ N.S., BERGHOEFER T.W. and ZINNECKER H.

Abstract (from CDS):

The galactic HII region IC 1396 contains one of the youngest known open star clusters Trumpler 37, Tr 37. Its very core hosts the multiple O-star system HD 206267, which in many respects is similar to the Orion Trapezium. So far X-ray emission has been observed only from HD 206267 with the Einstein observatory. Soft X-ray observations with the ROSAT PSPC revealed X-ray emission from an area of 30' radius around the center of globule IC 1396A, which was resolved into 85 discrete sources. Some of the emission still remains unresolved. Most of the detected X-ray sources, except HD 206267, are very weak, which causes the measured luminosity function to be cut off at log Lx<30.3(erg/s). X-ray sources are located not only in Tr 37 but are also scattered around the molecular globule IC 1396A. From the distribution of sources, their apparently hard spectra, and a steep luminosity function we argue that this sample contains a large number of previously unknown low-mass PMS stars. The X-ray source centered on HD 206267 appeared extended indicating a multiple source system at the very center of Tr 37. The total X-ray luminosity of the trapezium HD 206267 does compare with the X-ray luminosity of single O-type stars. We set an upper limit of log(Lx/Lbol) to -6.90 and briefly discuss this result in the context of colliding and eclipsing wind models in early type binaries.

Abstract Copyright: ∼

Journal keyword(s): X-rays: stars - stars: formation - stars: early-type - stars: pre-main sequence

Nomenclature: Table 1: Cl* IC 1396 SBZ 1-NN (Nos 1-1 to 1-16). Table 2: Cl* IC 1396 SBZ 2-NN (Nos 2-1 to 2-85)

Simbad objects: 104

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Number of rows : 104
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 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 635 1
2 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 703 1
3 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1375 0
4 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1154 1
5 HD 203802 ** 21 22 20.50554 +57 33 54.8312   9.32 8.92 8.71   G5 57 0
6 Cl* IC 1396 SBZ 1-11 * 21 23 11.7 +57 16 54           ~ 1 0
7 RX J2126.1+5550 * 21 26 06.1043004048 +55 50 24.191189340   12.15 11.41     K2V 4 0
8 IRAS 21262+5643 Sy1 21 27 45.3941483856 +56 56 34.915920720       16.6   ~ 162 0
9 Cl* IC 1396 SBZ 1-16 * 21 29 26.3 +55 33 17           ~ 1 0
10 HD 205113 PM* 21 31 01.3514130984 +59 25 05.374495704   7.54 6.87     G2.5V 29 0
11 Cl* IC 1396 SBZ 2-1 * 21 31 12.4 +57 30 28           ~ 1 0
12 Cl* IC 1396 SBZ 2-2 * 21 33 52.8930487752 +57 20 22.584935796           ~ 1 0
13 IRAS C21327+5717 IR 21 34.2 +57 30           ~ 2 0
14 Cl* IC 1396 SBZ 2-3 * 21 34 13.1 +57 26 58           ~ 1 0
15 HD 239702 SB* 21 34 34.3416 +56 32 48.049   10.69 9.76     G5 6 0
16 Cl* IC 1396 SBZ 2-6 RR* 21 34 46.6520264544 +57 01 29.642421864   15.05 14.09 13.73   ~ 2 0
17 Cl* IC 1396 SBZ 2-7 * 21 34 58.7 +57 24 57           ~ 1 0
18 Cl* IC 1396 SBZ 2-8 * 21 34 59.2 +57 18 55           ~ 1 0
19 LBN 098.83+04.12 MoC 21 35 +57.4           ~ 4 0
20 Cl* IC 1396 SBZ 2-9 * 21 35 03.0 +57 28 29           ~ 1 0
21 Cl* IC 1396 SBZ 2-10 * 21 35 15.51 +57 33 55.8           ~ 1 0
22 IRAS 21338+5711 IR 21 35 21.7 +57 25 07           ~ 2 0
23 BD+56 2596 * 21 35 23.4561567336 +57 31 28.053155604 9.98 10.40 10.23     B5 11 0
24 Cl* IC 1396 SBZ 2-13 * 21 35 27.5 +57 16 15           ~ 1 0
25 Cl* IC 1396 SBZ 2-14 * 21 35 28.4 +57 28 39           ~ 1 0
26 Cl* IC 1396 SBZ 2-15 * 21 35 31.9 +57 31 17           ~ 1 0
27 Cl* IC 1396 SBZ 2-16 * 21 35 35.2 +57 28 48           ~ 1 0
28 Cl* IC 1396 SBZ 2-17 * 21 35 46.5 +57 36 38           ~ 1 0
29 Cl* IC 1396 SBZ 2-18 * 21 35 53.7 +57 16 03           ~ 1 0
30 Cl* IC 1396 SBZ 2-19 * 21 35 54.5 +57 12 08           ~ 1 0
31 Cl* Trumpler 37 KUN 59 * 21 35 56.5566399864 +57 05 04.764535584   15.40 14.25     ~ 5 0
32 2MASS J21355654+5720529 Y*O 21 35 56.5572867096 +57 20 52.823851800   10.70 10.39     B4 16 0
33 NAME Elephant Trunk Nebula MoC 21 36 +57.4           ~ 51 0
34 HD 205850 * 21 36 02.7442635624 +57 28 13.973984508   9.54 13.39   9.98 F3 12 0
35 Cl* IC 1396 SBZ 2-23 * 21 36 14.8 +57 18 50           ~ 1 0
36 Cl* IC 1396 SBZ 2-24 * 21 36 16.0 +57 34 52           ~ 1 0
37 Cl* IC 1396 SBZ 2-25 * 21 36 20.2 +56 48 23           ~ 1 0
38 Cl* IC 1396 SBZ 2-26 * 21 36 24.0 +57 36 32           ~ 1 0
39 Cl* IC 1396 SBZ 2-27 * 21 36 24.6 +57 22 28           ~ 1 0
40 Cl Trumpler 37 440 Y*O 21 36 36.9083057962 +57 34 05.953208419   11.39 10.85     B4 7 0
41 HD 239710 Y*O 21 36 41.0384768496 +57 30 08.252240544 9.43 9.86 12.74     B3V 34 1
42 Cl Trumpler 37 443 * 21 36 48.2650188456 +57 39 18.455376924   11.67 10.47   10.06 G 4 0
43 EM* LkHA 349C TT* 21 36 49.4077187616 +57 31 21.971379612 19.219   15.81 14.508 13.094 K6 18 0
44 EM* LkHA 349 Or* 21 36 50.7250111992 +57 31 10.697659752   15.13 13.45 12.88 10.91 F9e 50 1
45 IRAS 21352+5610 V* 21 36 51.5716669344 +56 23 34.772090532           ~ 2 0
46 2MASS J21365395+5727587 Y*O 21 36 53.9530543440 +57 27 58.707581220     14.71   13.16 ~ 6 0
47 Cl* IC 1396 SBZ 2-33 Em* 21 36 58.1504798856 +56 34 43.472394444           ~ 2 0
48 Cl* IC 1396 SBZ 2-35 * 21 36 59.1275104248 +57 42 45.945092700   15.53 14.24 13.70   ~ 1 0
49 Cl* IC 1396 SBZ 2-36 * 21 37 00.8 +57 25 27           ~ 1 0
50 Cl* IC 1396 SBZ 2-37 * 21 37 00.883 +57 00 30.69           ~ 1 0
51 Cl Trumpler 37 162 * 21 37 05.9780766144 +57 12 19.568491344   10.87 10.31     F8 3 0
52 HD 239715 PM* 21 37 07.6214477208 +59 54 56.169219996   9.80 9.25     F8 4 0
53 Cl* IC 1396 SBZ 2-39 * 21 37 09.0801995616 +57 32 18.451835052   13.7       ~ 1 0
54 2MASS J21371054+5731124 TT* 21 37 10.5495135792 +57 31 12.452783268 19.896   16.74 15.224 14.70 K5 18 0
55 2MASS J21371070+5726103 Y*O 21 37 10.7023650432 +57 26 10.383537156   14.49 13.54 12.75 11.46 ~ 6 0
56 Cl* IC 1396 SBZ 2-42 * 21 37 11.2 +57 30 28           ~ 1 0
57 Cl* IC 1396 SBZ 2-44 * 21 37 17.1 +57 28 16           ~ 1 0
58 2MASS J21371840+5731206 Y*O 21 37 18.372 +57 31 20.94   12.39 12.14     A0 9 0
59 2MASS J21371956+5730489 Y*O 21 37 19.5769317408 +57 30 48.944458548   11.98 11.58     B8 10 0
60 Cl Trumpler 37 451 * 21 37 24.2607644184 +57 23 07.822676796   12.77 12.18 12.07   A5 4 0
61 Cl* IC 1396 SBZ 1-6 * 21 37 28.5 +57 48 14           ~ 1 0
62 Cl* IC 1396 SBZ 2-48 * 21 37 31.0 +57 48 12           ~ 1 0
63 Cl* IC 1396 SBZ 2-49 * 21 37 35.2 +56 45 06           ~ 1 0
64 Cl* IC 1396 SBZ 2-50 * 21 37 39.0168298104 +56 55 09.361489620   14.19 13.37 13.14   ~ 1 0
65 HD 206081 Y*O 21 37 40.93214 +57 33 37.4769 8.08 9.20 8.95 8.82   B1:Vn 30 0
66 Cl* IC 1396 SBZ 2-51 Y*? 21 37 42.9272161512 +57 36 31.508879256   13.73 12.70 12.44   ~ 9 0
67 HD 239718 PM* 21 37 43.5290419039 +56 59 10.944417493   10.36 9.88     F8 5 0
68 Cl* IC 1396 SBZ 2-54 * 21 37 47.0 +56 51 40           ~ 1 0
69 Cl* IC 1396 SBZ 2-55 * 21 37 50.8 +56 59 08           ~ 1 0
70 2MASS J21375176+5726525 Y*O 21 37 51.7734804528 +57 26 52.509586632   14.22 13.14 12.89 11.60 ~ 6 0
71 HD 239720 * 21 37 54.8756472360 +56 54 22.708141560   10.45 10.01 9.99   F5 5 0
72 Cl* IC 1396 SBZ 2-58 * 21 37 58.84 +57 31 34.9   13.1       ~ 1 0
73 Cl* IC 1396 SBZ 2-59 * 21 38 16.80 +57 22 32.1           ~ 1 0
74 Cl* IC 1396 SBZ 2-60 * 21 38 19.3 +56 38 26           ~ 1 0
75 Cl* IC 1396 SBZ 2-61 * 21 38 20.8 +56 39 23           ~ 1 0
76 Cl* IC 1396 SBZ 2-62 * 21 38 23.2 +56 37 19           ~ 1 0
77 Cl* IC 1396 SBZ 2-63 Em* 21 38 23.4104591352 +56 53 01.687237764           ~ 2 0
78 Cl* IC 1396 SBZ 2-64 * 21 38 25.9 +57 34 00           ~ 1 0
79 HD 206183 * 21 38 26.2840588344 +56 58 25.459055868 6.75 7.55 7.41     O9.5IV-V 97 0
80 Cl* IC 1396 SBZ 2-67 * 21 38 28.5082125504 +56 57 14.428838592       13.50   ~ 1 0
81 BD+57 2355 Y*O 21 38 29.1823 +57 41 22.638   11.31 10.65     A4 8 0
82 Cl* IC 1396 SBZ 2-68 * 21 38 30.8 +56 53 33           ~ 1 0
83 Cl* IC 1396 SBZ 2-79 * 21 38 37.7381395800 +57 58 19.823265408   14.97 13.59 13.37   ~ 1 0
84 Cl* IC 1396 SBZ 1-4 * 21 38 46.0 +58 35 49           ~ 1 0
85 HD 206267 SB* 21 38 57.6195772032 +57 29 20.554016280 5.09 5.83 5.62   5.56 O6.0V((f))+O9:V 499 0
86 IC 1396 OpC 21 38 58.8 +57 30 50           ~ 496 1
87 HD 239725 * 21 39 04.7524757808 +56 56 59.403338808 8.95 9.41 9.15     B2.5V 40 0
88 Cl* IC 1396 SBZ 2-71 * 21 39 05.4 +56 51 29           ~ 1 0
89 Cl* IC 1396 SBZ 2-72 * 21 39 12.5372357112 +57 23 20.698704024           ~ 1 0
90 Cl* IC 1396 SBZ 2-74 * 21 39 20.3 +57 04 02           ~ 1 0
91 Cl Trumpler 37 177 * 21 39 21.8503544976 +57 00 31.761408528   12.47 12.04     F8 3 0
92 V* V490 Cep HXB 21 39 30.6903047304 +56 59 10.421969280   15.2       B1.5Ve 167 1
93 Cl* IC 1396 SBZ 2-76 * 21 39 36.3 +56 51 29           ~ 1 0
94 Cl* IC 1396 SBZ 2-78 * 21 39 40.0488621312 +57 30 34.880418216   15.48 14.14 13.60   ~ 2 0
95 Cl* IC 1396 SBZ 2-77 * 21 39 41.1 +57 30 23           ~ 1 0
96 Cl* IC 1396 SBZ 2-80 * 21 39 53.5 +56 41 44           ~ 1 0
97 Cl* IC 1396 SBZ 2-81 * 21 40 19.5 +56 51 32           ~ 1 0
98 HD 206482 PM* 21 40 21.4476888120 +57 34 53.637407904   7.86 7.40     F5V 26 0
99 Cl* IC 1396 SBZ 2-84 dS* 21 41 15.4055408568 +57 45 29.948378652   13.97 12.99 12.76   ~ 3 0
100 HD 206773 Be* 21 42 24.1853979312 +57 44 09.795762276 6.30 7.10 6.87     B0V:pe 169 0
101 HD 239741 * 21 42 35.2328855424 +58 51 09.482904180   9.52 9.09     F5 5 1
102 HD 207514 PM* 21 47 35.2922476632 +58 16 54.871388436   9.142 8.45     K0V: 10 0
103 Cl* IC 1396 SBZ 1-2 * 21 49 17.2 +59 23 04           ~ 1 0
104 Ass Cep OB 2 As* 21 51 +60.0           ~ 294 0

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