1996A&A...312..818D


Query : 1996A&A...312..818D

1996A&A...312..818D - Astronomy and Astrophysics, volume 312, 818-832 (1996/8-3)

ROSAT survey of stellar X-ray sources in the young open cluster NGC 2516.

DACHS J. and HUMMEL W.

Abstract (from CDS):

The ROSAT PSPC detector was used to obtain a deep pointing with its center on the young open cluster NGC 2516 and total integration time of 9284 sec. Altogether 64 X-ray sources were detected showing strong concentration towards the optical cluster centre. This suggests that most of the sources are actually associated with NGC 2516. 42 of these sources could be identified with optical stars in the field of the cluster; after correction for a mean offset between optical and nominal ROSAT positions of about 13", optical star and X-ray source positions are found to agree, on the average, within about 9", while maximum observed positional differences amount to 27". X-ray sources identified with optical cluster stars include HR 3147 (=HD 66194; B2.5IVe), the visually brightest B star in the cluster, three close visual late B-type binaries (h 4027 A,B, h 4031 A,B, and I 1104 A,B) with projected separations ranging between about 4x1016cm and 6x1016cm, as well as several (six) chemically peculiar Bp/Ap(Si) and Ap(SrCrEu) stars. According to their known spectral or photometric properties, optical counterparts for most identified cluster X-ray sources are main-sequence stars between spectral types B9 and K0. No indication for a pulsed component of the X-ray flux pointing to a compact companion could be detected from X-ray photon arrival times for the prominent blue straggler star HR 3147, while one of the visual binary counterparts of X-ray cluster sources (I 1104 A/B) possibly exhibits a pulsed component. The fact that about half of the chemically peculiar Bp/Ap stars known in the cluster, all of them of the (magnetic) CP2 variety, are found to be counterparts to ROSAT X-ray sources, can be taken to suggest that stellar magnetic fields play a role in generating X-ray fluxes from early-type main-sequence stars. Luminosities of X-ray sources detected in the cluster are rather uniform, ranging between Lx(0.1-2.5keV)=0.4x1030 and 4.5x1030erg/s. 80 percent of the sources have relatively hard spectra, X-ray photons being recorded only in PSPC high-energy channels above 0.5keV. For only very few (six) bright X-ray sources in the field of NGC 2516, at least 30% of observed X-ray quanta fall into the low-energy channels between 0.16 and 0.5keV; four of these soft-spectrum sources could be identified with optical late-type stars in front of the cluster, including the nearby solar-type star HR 3138 (=HD 65907, MK: G0V).

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: chemically peculiar - stars: emission-line - stars: coronae - open clusters: individual: NGC 2516

VizieR on-line data: <Available at CDS (J/A+A/312/818): table2 table2.tex table3 table3.tex table6 table6.tex>

Nomenclature: Table 2: [DH96] NN (Nos 1-64)

CDS comments: Table 2, col.(2), Table 4, col(3): designations not in SIMBAD. Table 3: DK = Cl* NGC 2516 DAC

Simbad objects: 87

goto View the references in ADS

Number of rows : 87
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3279 0
2 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 953 0
3 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2928 0
4 1RXS J075235.8-610411 X 07 52 35.8 -61 04 11           ~ 1 1
5 CPD-60 909 Er* 07 52 53.4497448528 -60 47 09.836151900   11.17 10.56     ~ 12 0
6 [DH96] 3 X 07 55 02.45 -60 49 13.5           ~ 1 1
7 HD 65663 Be* 07 56 15.7697008 -61 05 57.949993 6.54 6.723 6.730     B8V 45 1
8 HD 65662 * 07 56 18.6483286488 -60 31 35.166305856   7.266 5.717     K3+IIIa 51 0
9 V* V607 Car a2* 07 56 22.6795854768 -61 17 02.136961464   9.365 9.340     ApSi 36 0
10 NGC 2516 105 * 07 56 22.86 -60 51 50.1   12.18 11.56     ~ 8 0
11 [DH96] 5 X 07 56 34.0 -60 48 05           ~ 1 0
12 CD-60 1926 * 07 56 38.4966866736 -60 46 33.938732136   10.21 10.1     A1V 23 0
13 CPD-60 944A a2* 07 56 45.1050993480 -60 48 54.285743628   8.345 8.370     B8pSi 43 0
14 NGC 2516 4 * 07 56 47.8337123472 -60 56 49.858610856   11.1 10.8   10.402 A7III 22 0
15 [DH96] 9 X 07 57 13.5 -60 33 14           ~ 1 0
16 [DH96] 10 X 07 57 15.9 -60 41 01           ~ 1 1
17 [DH96] 11 X 07 57 19.15 -60 56 34.2           ~ 1 0
18 CD-60 1936 * 07 57 19.8110014152 -60 48 46.298213784   9.49 9.30     B9V 35 0
19 [DH96] 12 X 07 57 19.95 -61 04 23.2           ~ 1 1
20 NGC 2516 107 * 07 57 23.1724381440 -60 49 38.491908888   11.85 11.30   10.661 ~ 22 0
21 [DH96] 15 X 07 57 27.7 -60 39 50           ~ 1 0
22 [DFM2003] 191 X 07 57 28.11 -60 51 20.4           ~ 2 1
23 [DH96] 17 X 07 57 31.6 -60 59 23           ~ 1 1
24 Cl* NGC 2516 DAC 230 * 07 57 32.0211589296 -60 37 22.311708204   13.389 12.792     ~ 10 0
25 CD-60 1946 SB* 07 57 37.8603841224 -60 54 32.082010704   8.89 8.81     B9V+A4V 39 0
26 HD 65950 V* 07 57 45.2194757688 -60 55 35.265618408 6.56 6.86 6.87     B8III 86 0
27 CD-60 1953 Be* 07 57 45.9261198264 -60 49 34.831188192   9.03 8.98     B9:p_sh_He-n 37 0
28 HD 65907 PM* 07 57 46.9142992394 -60 18 11.058944907 6.17 6.17 5.60     F9.5V 183 0
29 HD 65949 * 07 57 47.6703410424 -60 36 34.921501344 7.99 8.31 8.37     B8/9 90 0
30 CD-60 1954 * 07 57 49.1756925048 -60 41 01.094973432   8.62 8.59     B9.5V 38 0
31 [DH96] 21 X 07 57 53.9 -61 19 20           ~ 1 0
32 Cl* NGC 2516 JTH 7560 * 07 57 54.71 -60 35 57.7   19.345 17.638     ~ 3 0
33 [DH96] 23 X 07 57 55.15 -60 40 39.3           ~ 1 1
34 Cl* NGC 2516 DAC 403 SB* 07 57 55.4026796472 -60 48 27.198283896   13.624 12.905   12.029 ~ 21 0
35 [DH96] 25 X 07 57 59.6 -60 52 29           ~ 1 0
36 NGC 2516 85 SB* 07 58 02.3958635640 -60 46 47.314297956 12.71 12.67 12.07   11.327 ~ 28 0
37 V* V391 Car a2* 07 58 02.5012020672 -60 48 46.812060396   8.89 8.96     A0pEuCrSr 57 0
38 V* V356 Car EB* 07 58 02.9117451672 -60 36 53.230792248 7.22 7.55 7.59     B9.5IVpSi 87 0
39 [DH96] 28 X 07 58 05.9 -60 35 57           ~ 1 0
40 NGC 2516 OpC 07 58 06 -60 48.0           ~ 670 0
41 [DH96] 29 X 07 58 07.3 -60 44 49           ~ 1 1
42 CD-60 1964 EB* 07 58 08.0526772176 -60 46 49.994541948   8.43 8.38     B8.5V 29 0
43 [DH96] 30 X 07 58 09.4 -60 21 55           ~ 1 0
44 CD-60 1965 * 07 58 09.6293826072 -60 49 00.824187504   7.92 6.69     K2II 28 0
45 V* V392 Car EB* 07 58 10.4770762032 -60 51 57.409042680   9.69 9.48     A2Vp:Sr:Cr:Eu: 68 0
46 [DH96] 32 X 07 58 16.5 -60 35 52           ~ 2 0
47 NGC 2516 111 * 07 58 18.0219079344 -60 45 15.310702800   11.93 11.43   10.800 ~ 24 0
48 HD 66066A SB* 07 58 22.3036478592 -60 51 27.783448236 6.43 7.05 7.07     B8V 36 0
49 [DH96] 36 X 07 58 23.2 -60 40 25           ~ 1 0
50 Cl* NGC 2516 EGG 16 SB* 07 58 23.3983736471 -60 54 56.881441282 15.58 15.16 14.21   12.979 ~ 20 0
51 CD-60 1975 * 07 58 27.2893208016 -60 48 07.402806936   8.49 8.39     B9V 36 0
52 CD-60 1976 * 07 58 29.6867934672 -60 41 51.081972684   9.77 9.66   9.603 A0V 31 0
53 [DH96] 37 X 07 58 30.5 -60 49 06           ~ 1 1
54 [DH96] 38 X 07 58 30.65 -60 41 57.2           ~ 1 1
55 [DH96] 39 X 07 58 31.86 -60 46 03.7           ~ 1 0
56 V* V420 Car dS* 07 58 33.3112070184 -60 49 25.617767988   10.6 10.4   10.452 A3V 27 0
57 NGC 2516 78 * 07 58 33.3890177472 -60 44 27.417074568 13.62 13.53 12.84   12.005 ~ 22 0
58 Cl* NGC 2516 DAC 803 * 07 58 35.7255758376 -60 46 52.490530344 14.30 14.008 13.255 13.118 12.567 ~ 27 0
59 NGC 2516 72 ** 07 58 36.465816 -60 50 18.36132   12.30 11.69 11.55 10.980 ~ 23 0
60 Cl* NGC 2516 JJT 26 * 07 58 40.7915706888 -60 41 53.315330820   14.369 13.590   12.701 ~ 19 0
61 [DH96] 44 X 07 58 42.8 -60 55 27           ~ 1 0
62 [DH96] 45 X 07 58 49.35 -60 54 11.0           ~ 1 0
63 HD 66194 Be* 07 58 50.5509433080 -60 49 28.060460040 4.92 5.72 5.81 5.77 5.83 B3Vn 129 0
64 HD 66167 * 07 58 50.9506083696 -60 38 35.358436212   9.15 9.01 9.87   A0V 27 0
65 CD-60 1993 * 07 58 53.0151207336 -60 36 10.592172072   9.95 9.78   9.542 A1/2V 25 0
66 [DH96] 48 X 07 58 53.46 -60 35 59.4           ~ 1 1
67 [DH96] 49 X 07 58 54.9 -60 30 15           ~ 1 0
68 Cl* NGC 2516 JTH 10046 SB* 07 58 57.5495425896 -60 43 00.960651300   15.750 14.760   13.620 ~ 21 0
69 [DH96] 51 X 07 59 20.15 -60 45 32.7           ~ 1 1
70 V* V422 Car a2* 07 59 21.2942838672 -60 48 56.393118468   9.13 9.08     B8/9pSi 71 0
71 CD-60 2003 * 07 59 23.2610454552 -60 47 32.237563668   10.41 9.85     ~ 16 0
72 HD 66318 * 07 59 27.4731907320 -60 47 47.144978988   9.69 9.56   9.555 A0pEuCrSr 90 0
73 Cl* NGC 2516 DAC 96 SB* 07 59 32.1031859703 -60 48 45.029781686   14.798 13.941 13.669 12.860 ~ 23 0
74 [DH96] 56 X 07 59 33.1 -60 44 35           ~ 1 0
75 Cl* NGC 2516 DAC 879 SB* 07 59 40.0022314272 -60 42 31.216704084   15.820 14.774   13.568 ~ 15 0
76 [DH96] 58 X 07 59 50.56 -60 43 30.5           ~ 1 0
77 HD 66409 Ro* 07 59 57.8067798360 -60 44 48.469837128 8.08 8.40 8.41     B8IV/V 52 0
78 [DH96] 59 X 08 00 00.85 -60 23 33.4           ~ 1 0
79 [DH96] 60 X 08 00 13.4 -60 53 09           ~ 1 0
80 Cl* NGC 2516 DAC 647 * 08 00 18.08 -61 09 40.2   14.31 13.06     ~ 4 0
81 Cl* NGC 2516 DAC 868 * 08 00 24.0473391528 -60 42 03.695626620   13.48 12.82     ~ 11 0
82 HD 65875 Be* 08 00 44.1338106480 -02 52 54.913100736 5.68 6.49 6.59 6.48 6.50 B2.5Ve 133 0
83 [DH96] 63 X 08 00 56.45 -60 31 08.4           ~ 1 0
84 HD 66656 * 08 01 02.6548183728 -60 55 58.950947028   8.37 8.30     A0V 29 0
85 [DH96] 64 X 08 02 22.3 -60 34 30           ~ 1 0
86 IC 2391 OpC 08 41 10 -52 59.5           ~ 795 0
87 IC 2602 OpC 10 42 27 -64 25.6           ~ 640 0

To bookmark this query, right click on this link: simbad:objects in 1996A&A...312..818D and select 'bookmark this link' or equivalent in the popup menu


2023.01.27-16:18:09

© Université de Strasbourg/CNRS

    • Contact