2012MNRAS.423.3413N

Query : 2012MNRAS.423.3413N

2012MNRAS.423.3413N - Mon. Not. R. Astron. Soc., 423, 3413-3419 (2012/July-2)

Magnetometry of a sample of massive stars in Carina.

NAZE Y., BAGNULO S., PETIT V., RIVINIUS T., WADE G., RAUW G. and GAGNE M.

Abstract (from CDS):

X-ray surveys of the Carina nebula have revealed a few hard and luminous sources associated with early-type stars. Such unusual characteristics for the high-energy emission may be related to magnetically confined winds. To search for the presence of magnetic fields in these objects, we performed a limited spectropolarimetric survey using the Focal reducer and low dispersion spectrograph (FORS) instrument. The multi-object mode was used, so that a total of 21 OB stars could be investigated during a one-night-long run. A magnetic field was detected in two objects of the sample, with a 6σ significance: Tr16-22 and 13. Such a detection was expected for Tr16-22, as its X-ray emission is too bright, variable and hard, compared to other late-type O or O+OB systems. It is more surprising for Tr16-13, a poorly known star which so far has never shown any peculiar characteristics. Subsequent monitoring is now needed to ascertain the physical properties of these objects and enable a full modelling of their magnetic atmospheres and winds.

Based on data collected at ESO under Program ID 386.D-0624A.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: early-type - stars: individual: Tr16-22 - stars: individual: Tr16-13 - stars: magnetic field - open clusters and associations: individual: Car OB1

Simbad objects: 38

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Number of rows : 38
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 HD 108 SB* 00 06 03.3890541936 +63 40 46.771220928 6.79 7.58 7.40     O4-8f?p 338 0
2 V* IQ Aur a2* 05 19 00.0284573784 +33 44 54.220806888   5.201 5.371     A0p 293 0
3 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
4 * sig Ori E Y*O 05 38 47.2050040320 -02 35 40.521424812 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 486 0
5 HD 57682 * 07 22 02.0546074728 -08 58 45.766323408 5.20 6.24 6.43     O9.2IV 275 0
6 HD 66665 bC? 08 04 47.8516524576 +06 11 09.803109264 6.5 7.58 7.81     B1V 85 0
7 Ass Car OB 1 As* 10 38 -59.0           ~ 172 0
8 HD 93097 * 10 43 46.9854841224 -60 05 49.318738728 8.97 9.79 9.78 10.05 9.77 B0.5IV 29 0
9 HD 93128 SB* 10 43 54.3957741024 -59 32 57.497266716 8.82 8.97 8.77 9.40 8.71 O3.5V((fc))z 112 1
10 HD 93129B Y*? 10 43 57.6453994104 -59 32 53.765064780   10.40 8.84     O3.5V((f)) 78 0
11 HD 93146B * 10 43 59.4513715488 -60 05 13.424726256 9.07         O9.7IV 23 0
12 Cl Collinder 228 68 * 10 44 00.1425345912 -60 06 07.626241836 9.48 10.21 10.16     B0V 17 0
13 HD 93190 Be* 10 44 19.6107364872 -59 16 58.802853324 8.12 9.10 8.84 9.24   O9.7:V:(n)e 68 0
14 CPD-59 2571 Y*O 10 44 22.5135812280 -59 39 25.518245796 10.648 11.340 11.196   10.885 B3V 36 0
15 CPD-58 2649 SB* 10 44 30.364680 -59 37 26.48100 9.500 10.151 9.842 9.965 9.317 O7V+O8V 44 0
16 HD 93204 * 10 44 32.3390794992 -59 44 31.020804780 7.63 8.52 8.42 8.20 7.92 O5.5V((f)) 200 0
17 CPD-59 2583 Y*O 10 44 32.8936828008 -59 40 25.916315016 10.369 11.057 10.882   10.522 B1V 38 0
18 CD-59 3297 * 10 44 36.7776917976 -59 54 24.813636300 10.03 10.24 9.48 9.64 8.985 B1Ib 36 0
19 Cl Trumpler 16 14 Y*O 10 44 37.1725082376 -59 40 01.309453248 11.468 12.039 11.682   11.025 B1V 36 0
20 HD 303311 SB* 10 44 37.4602634976 -59 32 55.460525100 8.30 9.042 8.979 9.58 9.09 O6V((f))z 91 0
21 CPD-59 2596 * 10 44 40.9852706016 -59 40 10.195802508 11.034 11.670 11.273   10.574 B0V 28 0
22 HD 93250 ** 10 44 45.0275085072 -59 33 54.680974848 6.73 8.12 7.50 8.38   O4III(fc) 334 0
23 HD 305524 * 10 44 45.2430436392 -59 54 41.516898084 8.81 9.53 9.29 9.71   O6.5Vn((f))z 51 0
24 HD 305534 * 10 44 47.5135200936 -59 57 58.934234628 9.05 9.79 9.69 9.94   B0V+B0V 34 0
25 CPD-59 2606 * 10 44 54.0636121968 -59 41 29.400907740 10.496 11.168 10.905   10.490 B1V 37 0
26 CD-59 3304 SB* 10 44 54.7086302424 -59 56 01.842920808 9.48 10.29 10.10 10.17   O8.5V 31 0
27 CPD-59 2619 V* 10 45 02.1852042576 -59 42 01.145719332 10.764 11.428 11.173   10.714 B1V 34 0
28 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
29 Cl Trumpler 16 64 * 10 45 04.7621042301 -59 40 53.556775528 10.084 10.789 10.661   10.361 B1.5V:b 18 0
30 HD 303308 ** 10 45 05.9147911152 -59 40 05.925360036 7.45 8.30 8.17 7.92 7.75 O4.5V((fc)) 314 0
31 CPD-59 2629 * 10 45 08.2352224872 -59 46 06.976659612 10.780 11.336 10.848   9.971 O8.5Vp 78 0
32 CPD-59 2632 SB* 10 45 11.1814992264 -59 41 11.202110340 10.207 10.943 10.797   10.494 B1V 44 0
33 CD-59 3312 * 10 45 20.5691164488 -59 42 51.240399480 9.420 10.203 10.032 10.12 9.632 O9V 55 0
34 HD 93403 SB* 10 45 44.1198371784 -59 24 28.153300860 6.72 8.46 8.27 8.35   O5.5III(fc)var 203 1
35 HD 93501 * 10 46 22.0412952048 -60 01 18.910042176 8.51 9.16 9.0     B0V 36 0
36 HD 93843 Er* 10 48 37.7715351864 -60 13 25.518487656 6.37 7.29 7.33 8.23   O5III(fc) 184 0
37 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0V 959 0
38 HD 191612 SB* 20 09 28.6105997664 +35 44 01.286453904 7.40 8.07 7.80     O8fpe 250 0

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