2004A&A...417..667N

Query : 2004A&A...417..667N

2004A&A...417..667N - Astronomy and Astrophysics, volume 417667-677 (2004/4-2)

HD 108: The mystery deepens with XMM-Newton observations.

NAZE Y., RAUW G., VREUX J.-M. and DE BECKER M.

Abstract (from CDS):

In 2001, using a large spectroscopic dataset from an extensive monitoring campaign, we discovered that the peculiar Of star HD 108 displayed extreme line variations. This strange behaviour could be attributed to a variety of models, and an investigation of the high energy properties of HD 108 was needed to test the predictions from these models. Our dedicated XMM-Newton observation of HD 108 shows that its spectrum is well represented by a two temperature thermal plasma model with kT1∼0.2keV and kT2∼1.4keV. In addition, we find that the star does not display any significant short-term changes during the XMM-Newton exposure. Compared to previous Einstein and ROSAT detections, it also appears that HD 108 does not present long-term flux variations either. While the line variations continue to modify HD 108's spectrum in the optical domain, the X-ray emission of the star appears thus surprisingly stable: no simple model is for the moment able to explain such an unexpected behaviour. Thanks to its high sensitivity, the XMM-Newton observatory has also enabled the serendipitous discovery of 57 new X-ray sources in the field of HD 108. Their properties are also discussed in this paper.

Abstract Copyright: ∼

Journal keyword(s): stars: early-type - X-rays: stars - stars: winds, outflows - stars: individual: HD 108

CDS comments: Table 3: Numbering NN in the first column is not used in SIMBAD,

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 XMMU J000405.7+633408 X 00 04 05.7 +63 34 08           ~ 1 0
2 XMMU J000410.6+633939 X 00 04 10.6 +63 39 39           ~ 1 0
3 XMMU J000414.7+633815 X 00 04 14.7 +63 38 15           ~ 1 0
4 XMMU J000417.7+633449 X 00 04 17.7 +64 04 49           ~ 1 0
5 XMMU J000419.7+634042 X 00 04 19.7 +63 40 42           ~ 1 0
6 XMMU J000420.8+633920 X 00 04 20.8 +63 39 20           ~ 1 0
7 XMMU J000428.5+633121 X 00 04 28.5 +63 31 21           ~ 1 0
8 XMMU J000433.3+634415 X 00 04 33.3 +63 44 15           ~ 1 0
9 LS I +63 35 * 00 04 33.8976952032 +63 32 28.310309268   10.89 10.60     B9II 8 0
10 XMMU J000440.1+633219 X 00 04 40.23 +63 32 18.7           ~ 1 0
11 ZTF J000441.82+633535.8 RS* 00 04 41.8439198616 +63 35 35.747512188           ~ 3 0
12 2MASS J00044428+6337384 * 00 04 44.2972630200 +63 37 38.348400144           ~ 1 0
13 XMMU J000445.1+633550 X 00 04 45.1 +63 35 50           ~ 1 0
14 XMMU J000448.0+634126 X 00 04 48.0 +63 41 26           ~ 1 0
15 XMMU J000457.6+634211 X 00 04 57.76 +63 42 11.4           ~ 1 0
16 LS I +63 36 * 00 05 00.8525727120 +63 49 33.206532924   11.52 11.06     B0V 15 0
17 XMMU J000502.1+633844 X 00 05 02.1 +63 38 44           ~ 1 0
18 2MASS J00050336+6347443 * 00 05 03.3557217792 +63 47 44.523462588           ~ 2 0
19 XMMU J000506.8+633453 X 00 05 06.8 +63 34 53           ~ 1 0
20 ZTF J000510.06+634734.3 EB* 00 05 09.9054009336 +63 47 34.131775920           ~ 4 0
21 XMMU J000511.7+634018 X 00 05 11.7 +63 40 18           ~ 1 0
22 BD+62 2362 * 00 05 23.9408286048 +63 47 20.858478468   9.92 9.7     B7III 22 0
23 TYC 4022-73-1 * 00 05 25.5384774768 +63 45 50.081713164   11.98 11.81     ~ 1 0
24 BD+63 2105 * 00 05 33.9460521624 +63 49 01.405784712   9.81 9.2     A7II 18 0
25 XMMU J000535.5+633914 X 00 05 35.5 +63 39 14           ~ 1 0
26 XMMU J000536.5+633728 X 00 05 36.5 +63 37 28           ~ 1 0
27 XMMU J000537.1+634027 X 00 05 37.1 +63 40 27           ~ 1 0
28 XMMU J000537.9+633034 X 00 05 37.9 +63 30 34           ~ 1 0
29 TYC 4018-1312-1 * 00 05 39.6738201312 +63 31 08.530380732   12.08 11.88     ~ 1 0
30 XMMU J000541.5+633711 X 00 05 41.5 +63 37 11           ~ 1 0
31 XMMU J000542.7+634125 X 00 05 42.7 +63 41 25           ~ 1 0
32 2MASS J00054272+6338341 * 00 05 42.7428617856 +63 38 34.195156800           ~ 1 0
33 XMMU J000544.6+633444 X 00 05 44.6 +63 34 44           ~ 1 0
34 XMMU J000546.5+632831 X 00 05 46.5 +63 28 31           ~ 1 0
35 XMMU J000547.7+633955 X 00 05 47.7 +63 39 55           ~ 1 0
36 XMMU J000551.7+634304 X 00 05 51.7 +63 43 04           ~ 1 0
37 2MASS J00055370+6345344 X 00 05 53.7152075664 +63 45 34.535669616           ~ 1 0
38 EM* GGR 168 Em* 00 05 57.6050203320 +63 37 01.344912600   11.64 11.24     B 13 0
39 XMMU J000558.0+633710 X 00 05 58.0 +63 37 10           ~ 1 0
40 XMMU J000558.7+635208 X 00 05 58.7 +63 52 08           ~ 1 0
41 XMMU J000559.5+634149 X 00 05 59.5 +63 41 49           ~ 1 0
42 HD 108 SB* 00 06 03.3890541936 +63 40 46.771220928 6.79 7.58 7.40     O4-8f?p 338 0
43 XMMU J000606.4+633347 X 00 06 06.4 +63 33 47           ~ 1 0
44 XMMU J000621.9+634321 X 00 06 21.9 +63 43 21           ~ 1 0
45 BD+62 2365 * 00 06 24 +63 38.8     9.5     ~ 2 0
46 XMMU J000624.8+633737 X 00 06 24.8 +63 37 37           ~ 1 0
47 2MASS J00062964+6341066 * 00 06 29.6741628696 +63 41 06.627123528           ~ 1 0
48 XMMU J000632.3+634127 X 00 06 32.3 +63 41 27           ~ 1 0
49 XMMU J000638.4+634902 X 00 06 38.4 +63 49 02           ~ 1 0
50 XMMU J000639.8+633627 X 00 06 39.8 +63 36 27           ~ 1 0
51 XMMU J000640.1+634255 X 00 06 40.1 +63 42 55           ~ 1 0
52 XMMU J000642.9+633308 X 00 06 42.9 +63 33 08           ~ 1 0
53 BD+62 2368 * 00 06 43.9561655208 +63 39 11.862970164   10.79 10.35     F7V 4 0
54 XMMU J000644.2+633739 X 00 06 44.2 +63 37 39           ~ 1 0
55 XMMU J000647.2+633602 X 00 06 47.2 +63 36 02           ~ 1 0
56 XMMU J000647.5+634947 X 00 06 47.5 +63 49 47           ~ 1 0
57 XMMU J000658.1+633221 X 00 06 58.1 +63 32 21           ~ 1 0
58 XMMU J000701.3+635130 X 00 07 01.3 +63 51 30           ~ 1 0
59 XMMU J000701.7+634151 X 00 07 01.7 +63 41 51           ~ 1 0
60 XMMU J000705.7+634447 X 00 07 05.7 +63 44 47           ~ 1 0
61 XMMU J000707.8+634721 X 00 07 07.8 +63 47 21           ~ 1 0
62 XMMU J000713.2+633439 X 00 07 13.2 +63 34 39           ~ 1 0
63 XMMU J000718.8+633857 X 00 07 18.8 +63 38 57           ~ 1 0
64 BD+62 2369 * 00 07 20.6187844992 +63 40 30.177019596   10.59 10.26     A5V 2 0
65 EM* GGR 169 Em* 00 07 57.7049913864 +63 40 43.453730784   10.99 10.68     O8 13 0
66 HD 16429 ** 02 40 44.9492589168 +61 16 55.995618720 7.91 8.29 7.67     O9.5III+F4V 165 1
67 HD 34656 Em* 05 20 43.0812017952 +37 26 19.195066068 5.87 6.77 6.76     O7.5II(f) 213 0
68 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
69 HD 167771 SB* 18 17 28.5570708120 -18 27 48.424975128 5.81 6.65 6.54 7.43   O7III((f))+O8III 189 0
70 HD 218915 s*b 23 11 06.9483955128 +53 03 29.652921252 6.32 7.22 7.20     O9.2Iab 206 1

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